applied intellij code cleanup

dhp-common/src/main/java/eu/dnetlib/dhp/common/DbClient.java

@@ -14,7 +14,7 @@ public class DbClient implements Closeable {
 
 	private static final Log log = LogFactory.getLog(DbClient.class);
 
-	private Connection connection;
+	private final Connection connection;
 
 	public DbClient(final String address, final String login, final String password) {
 

dhp-common/src/main/java/eu/dnetlib/dhp/common/MakeTarArchive.java

@@ -100,7 +100,7 @@ public class MakeTarArchive implements Serializable {
 			BufferedInputStream bis = new BufferedInputStream(is);
 
 			int count;
-			byte data[] = new byte[1024];
+			byte[] data = new byte[1024];
 			while ((count = bis.read(data, 0, data.length)) != -1) {
 				ar.write(data, 0, count);
 			}

dhp-common/src/main/java/eu/dnetlib/dhp/common/api/InputStreamRequestBody.java

@@ -13,9 +13,9 @@ import okio.Source;
 
 public class InputStreamRequestBody extends RequestBody {
 
-	private InputStream inputStream;
+	private final InputStream inputStream;
-	private MediaType mediaType;
+	private final MediaType mediaType;
-	private long lenght;
+	private final long lenght;
 
 	public static RequestBody create(final MediaType mediaType, final InputStream inputStream, final long len) {
 

dhp-common/src/main/java/eu/dnetlib/dhp/common/rest/DNetRestClient.java

@@ -21,7 +21,7 @@ public class DNetRestClient {
 
 	private static final Logger log = LoggerFactory.getLogger(DNetRestClient.class);
 
-	private static ObjectMapper mapper = new ObjectMapper();
+	private static final ObjectMapper mapper = new ObjectMapper();
 
 	public static <T> T doGET(final String url, Class<T> clazz) throws Exception {
 		final HttpGet httpGet = new HttpGet(url);

dhp-common/src/main/java/eu/dnetlib/dhp/message/MessageSender.java

@@ -34,7 +34,7 @@ public class MessageSender {
 
 	private final String workflowId;
 
-	private ExecutorService executorService = Executors.newCachedThreadPool();
+	private final ExecutorService executorService = Executors.newCachedThreadPool();
 
 	public MessageSender(final String dnetMessageEndpoint, final String workflowId) {
 		this.workflowId = workflowId;

dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/utils/OafMapperUtils.java

@@ -32,11 +32,11 @@ public class OafMapperUtils {
 		if (ModelSupport.isSubClass(left, Result.class)) {
 			return mergeResults((Result) left, (Result) right);
 		} else if (ModelSupport.isSubClass(left, Datasource.class)) {
-			((Datasource) left).mergeFrom((Datasource) right);
+			left.mergeFrom(right);
 		} else if (ModelSupport.isSubClass(left, Organization.class)) {
-			((Organization) left).mergeFrom((Organization) right);
+			left.mergeFrom(right);
 		} else if (ModelSupport.isSubClass(left, Project.class)) {
-			((Project) left).mergeFrom((Project) right);
+			left.mergeFrom(right);
 		} else {
 			throw new RuntimeException("invalid OafEntity subtype:" + left.getClass().getCanonicalName());
 		}

dhp-common/src/main/java/eu/dnetlib/dhp/utils/ISLookupClientFactory.java

@@ -15,8 +15,8 @@ public class ISLookupClientFactory {
 
 	private static final Logger log = LoggerFactory.getLogger(ISLookupClientFactory.class);
 
-	private static int requestTimeout = 60000 * 10;
+	private static final int requestTimeout = 60000 * 10;
-	private static int connectTimeout = 60000 * 10;
+	private static final int connectTimeout = 60000 * 10;
 
 	public static ISLookUpService getLookUpService(final String isLookupUrl) {
 		return getServiceStub(ISLookUpService.class, isLookupUrl);

dhp-common/src/test/java/eu/dnetlib/dhp/schema/oaf/utils/OafMapperUtilsTest.java

@@ -22,7 +22,7 @@ import eu.dnetlib.dhp.schema.oaf.Result;
 
 public class OafMapperUtilsTest {
 
-	private static ObjectMapper OBJECT_MAPPER = new ObjectMapper()
+	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
 		.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 
 	@Test

dhp-workflows/dhp-actionmanager/src/main/java/eu/dnetlib/dhp/actionmanager/promote/PromoteActionPayloadForGraphTableJob.java

@@ -160,9 +160,9 @@ public class PromoteActionPayloadForGraphTableJob {
 
 	private static String extractPayload(Row value) {
 		try {
-			return value.<String> getAs("payload");
+			return value.getAs("payload");
 		} catch (IllegalArgumentException | ClassCastException e) {
-			logger.error("cannot extract payload from action: {}", value.toString());
+			logger.error("cannot extract payload from action: {}", value);
 			throw e;
 		}
 	}

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/bipfinder/CollectAndSave.java

@@ -75,7 +75,6 @@ public class CollectAndSave implements Serializable {
 			.union(sc.sequenceFile(inputPath + "/otherresearchproduct", Text.class, Text.class))
 			.union(sc.sequenceFile(inputPath + "/software", Text.class, Text.class))
 			.saveAsHadoopFile(outputPath, Text.class, Text.class, SequenceFileOutputFormat.class);
-		;
 	}
 
 	private static void removeOutputDir(SparkSession spark, String path) {

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/bipfinder/SparkAtomicActionScoreJob.java

@@ -36,7 +36,7 @@ import scala.Tuple2;
  */
 public class SparkAtomicActionScoreJob implements Serializable {
 
-	private static String DOI = "doi";
+	private static final String DOI = "doi";
 	private static final Logger log = LoggerFactory.getLogger(SparkAtomicActionScoreJob.class);
 	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
 

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/project/PrepareProgramme.java

@@ -249,7 +249,7 @@ public class PrepareProgramme {
 							parent = parent.substring(parent.lastIndexOf("|") + 1).trim();
 						}
 						if (current.trim().length() > parent.length()
-							&& current.toLowerCase().trim().substring(0, parent.length()).equals(parent)) {
+							&& current.toLowerCase().trim().startsWith(parent)) {
 							current = current.substring(parent.length() + 1);
 							if (current.trim().charAt(0) == '-' || current.trim().charAt(0) == '–') {
 								current = current.trim().substring(1).trim();

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/project/PrepareProjects.java

@@ -93,7 +93,7 @@ public class PrepareProjects {
 	}
 
 	private static FlatMapFunction<Tuple2<ProjectSubset, CSVProject>, CSVProject> getTuple2CSVProjectFlatMapFunction() {
-		return (FlatMapFunction<Tuple2<ProjectSubset, CSVProject>, CSVProject>) value -> {
+		return value -> {
 			Optional<CSVProject> csvProject = Optional.ofNullable(value._2());
 			List<CSVProject> csvProjectList = new ArrayList<>();
 			if (csvProject.isPresent()) {

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/project/utils/ReadCSV.java

@@ -28,7 +28,7 @@ public class ReadCSV implements Closeable {
 	private final Configuration conf;
 	private final BufferedWriter writer;
 	private final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
-	private String csvFile;
+	private final String csvFile;
 
 	public static void main(final String[] args) throws Exception {
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
@@ -85,7 +85,6 @@ public class ReadCSV implements Closeable {
 
 		this.writer = new BufferedWriter(new OutputStreamWriter(fsDataOutputStream, StandardCharsets.UTF_8));
 		this.csvFile = httpConnector.getInputSource(fileURL);
-		;
 	}
 
 	protected void write(final Object p) {

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/project/utils/ReadExcel.java

@@ -25,7 +25,7 @@ public class ReadExcel implements Closeable {
 	private final Configuration conf;
 	private final BufferedWriter writer;
 	private final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
-	private InputStream excelFile;
+	private final InputStream excelFile;
 
 	public static void main(final String[] args) throws Exception {
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
@@ -82,7 +82,6 @@ public class ReadExcel implements Closeable {
 
 		this.writer = new BufferedWriter(new OutputStreamWriter(fsDataOutputStream, StandardCharsets.UTF_8));
 		this.excelFile = httpConnector.getInputSourceAsStream(fileURL);
-		;
 	}
 
 	protected void write(final Object p) {

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/aggregation/common/ReportingJob.java

@@ -18,7 +18,7 @@ public abstract class ReportingJob {
 	 */
 	public static final int INITIAL_DELAY = 2;
 
-	private ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
+	private final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
 
 	protected final AggregatorReport report;
 

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/collection/CollectorWorkerApplication.java

@@ -30,7 +30,7 @@ public class CollectorWorkerApplication {
 
 	private static final Logger log = LoggerFactory.getLogger(CollectorWorkerApplication.class);
 
-	private FileSystem fileSystem;
+	private final FileSystem fileSystem;
 
 	public CollectorWorkerApplication(FileSystem fileSystem) {
 		this.fileSystem = fileSystem;

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/collection/HttpConnector2.java

@@ -32,7 +32,7 @@ public class HttpConnector2 {
 
 	private String responseType = null;
 
-	private String userAgent = "Mozilla/5.0 (compatible; OAI; +http://www.openaire.eu)";
+	private final String userAgent = "Mozilla/5.0 (compatible; OAI; +http://www.openaire.eu)";
 
 	public HttpConnector2() {
 		this(new HttpClientParams());

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/collection/plugin/oai/OaiIterator.java

@@ -42,7 +42,7 @@ public class OaiIterator implements Iterator<String> {
 	private String token;
 	private boolean started;
 	private final HttpConnector2 httpConnector;
-	private AggregatorReport report;
+	private final AggregatorReport report;
 
 	public OaiIterator(
 		final String baseUrl,

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/collection/plugin/rest/RestCollectorPlugin.java

@@ -26,7 +26,7 @@ public class RestCollectorPlugin implements CollectorPlugin {
 
 	public static final String RESULT_SIZE_VALUE_DEFAULT = "100";
 
-	private HttpClientParams clientParams;
+	private final HttpClientParams clientParams;
 
 	public RestCollectorPlugin(HttpClientParams clientParams) {
 		this.clientParams = clientParams;

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/collection/plugin/rest/RestIterator.java

@@ -48,18 +48,18 @@ public class RestIterator implements Iterator<String> {
 	private static final Logger log = LoggerFactory.getLogger(RestIterator.class);
 	public static final String UTF_8 = "UTF-8";
 
-	private HttpClientParams clientParams;
+	private final HttpClientParams clientParams;
 
 	private final String BASIC = "basic";
 
-	private JsonUtils jsonUtils;
+	private final JsonUtils jsonUtils;
 
-	private String baseUrl;
+	private final String baseUrl;
-	private String resumptionType;
+	private final String resumptionType;
-	private String resumptionParam;
+	private final String resumptionParam;
-	private String resultFormatValue;
+	private final String resultFormatValue;
 	private String queryParams;
-	private int resultSizeValue;
+	private final int resultSizeValue;
 	private int resumptionInt = 0; // integer resumption token (first record to harvest)
 	private int resultTotal = -1;
 	private String resumptionStr = Integer.toString(resumptionInt); // string resumption token (first record to harvest
@@ -71,11 +71,11 @@ public class RestIterator implements Iterator<String> {
 	private XPathExpression xprResultTotalPath;
 	private XPathExpression xprResumptionPath;
 	private XPathExpression xprEntity;
-	private String queryFormat;
+	private final String queryFormat;
-	private String querySize;
+	private final String querySize;
-	private String authMethod;
+	private final String authMethod;
-	private String authToken;
+	private final String authToken;
-	private Queue<String> recordQueue = new PriorityBlockingQueue<String>();
+	private final Queue<String> recordQueue = new PriorityBlockingQueue<String>();
 	private int discoverResultSize = 0;
 	private int pagination = 1;
 	/*
@@ -83,7 +83,7 @@ public class RestIterator implements Iterator<String> {
 	 * json. useful for cases when the target API expects a resultFormatValue != json, but the results are returned in
 	 * json. An example is the EU Open Data Portal API: resultFormatValue=standard, results are in json format.
 	 */
-	private String resultOutputFormat;
+	private final String resultOutputFormat;
 
 	/** RestIterator class
 	 *  compatible to version 1.3.33
@@ -229,7 +229,7 @@ public class RestIterator implements Iterator<String> {
 
 			resultStream = theHttpInputStream;
 			if ("json".equals(resultOutputFormat)) {
-				resultJson = IOUtils.toString(resultStream, UTF_8);
+				resultJson = IOUtils.toString(resultStream, StandardCharsets.UTF_8);
 				resultXml = jsonUtils.convertToXML(resultJson);
 				resultStream = IOUtils.toInputStream(resultXml, UTF_8);
 			}

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/transformation/TransformSparkJobNode.java

@@ -36,7 +36,7 @@ public class TransformSparkJobNode {
 
 	private static final Logger log = LoggerFactory.getLogger(TransformSparkJobNode.class);
 
-	private static int RECORDS_PER_TASK = 200;
+	private static final int RECORDS_PER_TASK = 200;
 
 	public static void main(String[] args) throws Exception {
 

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/transformation/xslt/PersonCleaner.java

@@ -26,7 +26,7 @@ public class PersonCleaner implements ExtensionFunction, Serializable {
 	private List<String> surname = Lists.newArrayList();
 	private List<String> fullname = Lists.newArrayList();
 
-	private static Set<String> particles = null;
+	private static final Set<String> particles = null;
 
 	public PersonCleaner() {
 

dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/project/EXCELParserTest.java

@@ -20,7 +20,7 @@ import eu.dnetlib.dhp.collection.HttpConnector2;
 public class EXCELParserTest {
 
 	private static Path workingDir;
-	private HttpConnector2 httpConnector = new HttpConnector2();
+	private final HttpConnector2 httpConnector = new HttpConnector2();
 	private static final String URL = "http://cordis.europa.eu/data/reference/cordisref-H2020topics.xlsx";
 
 	@BeforeAll

dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/collection/plugin/rest/RestCollectorPluginTest.java

@@ -25,22 +25,22 @@ public class RestCollectorPluginTest {
 
 	private static final Logger log = LoggerFactory.getLogger(RestCollectorPluginTest.class);
 
-	private String baseUrl = "https://share.osf.io/api/v2/search/creativeworks/_search";
+	private final String baseUrl = "https://share.osf.io/api/v2/search/creativeworks/_search";
-	private String resumptionType = "count";
+	private final String resumptionType = "count";
-	private String resumptionParam = "from";
+	private final String resumptionParam = "from";
-	private String entityXpath = "//hits/hits";
+	private final String entityXpath = "//hits/hits";
-	private String resumptionXpath = "//hits";
+	private final String resumptionXpath = "//hits";
-	private String resultTotalXpath = "//hits/total";
+	private final String resultTotalXpath = "//hits/total";
-	private String resultFormatParam = "format";
+	private final String resultFormatParam = "format";
-	private String resultFormatValue = "json";
+	private final String resultFormatValue = "json";
-	private String resultSizeParam = "size";
+	private final String resultSizeParam = "size";
-	private String resultSizeValue = "10";
+	private final String resultSizeValue = "10";
 	// private String query = "q=%28sources%3ASocArXiv+AND+type%3Apreprint%29";
-	private String query = "q=%28sources%3AengrXiv+AND+type%3Apreprint%29";
+	private final String query = "q=%28sources%3AengrXiv+AND+type%3Apreprint%29";
 	// private String query = "=(sources:engrXiv AND type:preprint)";
 
-	private String protocolDescriptor = "rest_json2xml";
+	private final String protocolDescriptor = "rest_json2xml";
-	private ApiDescriptor api = new ApiDescriptor();
+	private final ApiDescriptor api = new ApiDescriptor();
 	private RestCollectorPlugin rcp;
 
 	@BeforeEach

dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/collection/plugin/rest/RestIteratorTest.java

@@ -20,20 +20,20 @@ public class RestIteratorTest {
 
 	private static final Logger log = LoggerFactory.getLogger(RestIteratorTest.class);
 
-	private String baseUrl = "https://share.osf.io/api/v2/search/creativeworks/_search";
+	private final String baseUrl = "https://share.osf.io/api/v2/search/creativeworks/_search";
-	private String resumptionType = "count";
+	private final String resumptionType = "count";
-	private String resumptionParam = "from";
+	private final String resumptionParam = "from";
-	private String resumptionXpath = "";
+	private final String resumptionXpath = "";
-	private String resultTotalXpath = "//hits/total";
+	private final String resultTotalXpath = "//hits/total";
-	private String entityXpath = "//hits/hits";
+	private final String entityXpath = "//hits/hits";
-	private String resultFormatParam = "format";
+	private final String resultFormatParam = "format";
-	private String resultFormatValue = "Json"; // Change from lowerCase to one UpperCase
+	private final String resultFormatValue = "Json"; // Change from lowerCase to one UpperCase
-	private String resultSizeParam = "size";
+	private final String resultSizeParam = "size";
-	private String resultSizeValue = "10";
+	private final String resultSizeValue = "10";
-	private String authMethod = "";
+	private final String authMethod = "";
-	private String authToken = "";
+	private final String authToken = "";
-	private String resultOffsetParam = "cursor";
+	private final String resultOffsetParam = "cursor";
-	private String query = "q=%28sources%3ASocArXiv+AND+type%3Apreprint%29";
+	private final String query = "q=%28sources%3ASocArXiv+AND+type%3Apreprint%29";
 
 	@Disabled
 	@Test

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/CheckDuplictedIdsJob.java

@@ -4,6 +4,8 @@ package eu.dnetlib.dhp.broker.oa;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang.StringUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.FilterFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Encoder;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.SaveMode;
@@ -47,26 +49,22 @@ public class CheckDuplictedIdsJob {
 
 		final LongAccumulator total = spark.sparkContext().longAccumulator("invaild_event_id");
 
-		final TypedColumn<Tuple2<String, Long>, Tuple2<String, Long>> agg = new CountAggregator().toColumn();
+		final Encoder<Tuple2<String, Long>> encoder = Encoders.tuple(Encoders.STRING(), Encoders.LONG());
-
 		ClusterUtils
 			.readPath(spark, eventsPath, Event.class)
-			.map(e -> new Tuple2<>(e.getEventId(), 1l), Encoders.tuple(Encoders.STRING(), Encoders.LONG()))
+			.map((MapFunction<Event, Tuple2<String, Long>>) e -> new Tuple2<>(e.getEventId(), 1l), encoder)
-			.groupByKey(t -> t._1, Encoders.STRING())
+			.groupByKey((MapFunction<Tuple2<String, Long>, String>) t -> t._1, Encoders.STRING())
-			.agg(agg)
+			.agg(new CountAggregator().toColumn())
-			.map(t -> t._2, Encoders.tuple(Encoders.STRING(), Encoders.LONG()))
+			.map((MapFunction<Tuple2<String, Tuple2<String, Long>>, Tuple2<String, Long>>) t -> t._2, encoder)
-			.filter(t -> t._2 > 1)
+			.filter((FilterFunction<Tuple2<String, Long>>) t -> t._2 > 1)
-			.map(o -> ClusterUtils.incrementAccumulator(o, total), Encoders.tuple(Encoders.STRING(), Encoders.LONG()))
+			.map(
+				(MapFunction<Tuple2<String, Long>, Tuple2<String, Long>>) o -> ClusterUtils
+					.incrementAccumulator(o, total),
+				encoder)
 			.write()
 			.mode(SaveMode.Overwrite)
 			.option("compression", "gzip")
 			.json(countPath);
-		;
-
-	}
-
-	private static String eventAsJsonString(final Event f) throws JsonProcessingException {
-		return new ObjectMapper().writeValueAsString(f);
 	}
 
 }

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/GenerateEventsJob.java

@@ -12,6 +12,8 @@ import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.spark.SparkConf;
 import org.apache.spark.SparkContext;
+import org.apache.spark.api.java.function.FlatMapFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.util.LongAccumulator;
@@ -77,11 +79,11 @@ public class GenerateEventsJob {
 
 			final Dataset<Event> dataset = groups
 				.map(
-					g -> EventFinder
+					(MapFunction<ResultGroup, EventGroup>) g -> EventFinder
 						.generateEvents(g, dsIdWhitelist, dsIdBlacklist, dsTypeWhitelist, topicWhitelist, accumulators),
 					Encoders
 						.bean(EventGroup.class))
-				.flatMap(g -> g.getData().iterator(), Encoders.bean(Event.class));
+				.flatMap((FlatMapFunction<EventGroup, Event>) g -> g.getData().iterator(), Encoders.bean(Event.class));
 
 			ClusterUtils.save(dataset, eventsPath, Event.class, total);
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/GenerateStatsJob.java

@@ -13,6 +13,7 @@ import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.SaveMode;
 import org.apache.spark.sql.TypedColumn;
@@ -24,6 +25,7 @@ import eu.dnetlib.dhp.broker.model.Event;
 import eu.dnetlib.dhp.broker.oa.util.ClusterUtils;
 import eu.dnetlib.dhp.broker.oa.util.aggregators.stats.DatasourceStats;
 import eu.dnetlib.dhp.broker.oa.util.aggregators.stats.StatsAggregator;
+import scala.Tuple2;
 
 public class GenerateStatsJob {
 
@@ -71,9 +73,13 @@ public class GenerateStatsJob {
 
 			ClusterUtils
 				.readPath(spark, eventsPath, Event.class)
-				.groupByKey(e -> e.getTopic() + "@@@" + e.getMap().getTargetDatasourceId(), Encoders.STRING())
+				.groupByKey(
+					(MapFunction<Event, String>) e -> e.getTopic() + "@@@" + e.getMap().getTargetDatasourceId(),
+					Encoders.STRING())
 				.agg(aggr)
-				.map(t -> t._2, Encoders.bean(DatasourceStats.class))
+				.map(
+					(MapFunction<Tuple2<String, DatasourceStats>, DatasourceStats>) t -> t._2,
+					Encoders.bean(DatasourceStats.class))
 				.write()
 				.mode(SaveMode.Overwrite)
 				.jdbc(dbUrl, "oa_datasource_stats_temp", connectionProperties);

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/IndexEventSubsetJob.java

@@ -13,6 +13,8 @@ import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;
 import org.apache.spark.SparkConf;
 import org.apache.spark.api.java.JavaRDD;
+import org.apache.spark.api.java.function.FlatMapFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.SparkSession;
@@ -30,6 +32,7 @@ import eu.dnetlib.dhp.broker.model.Event;
 import eu.dnetlib.dhp.broker.oa.util.ClusterUtils;
 import eu.dnetlib.dhp.broker.oa.util.EventGroup;
 import eu.dnetlib.dhp.broker.oa.util.aggregators.subset.EventSubsetAggregator;
+import scala.Tuple2;
 
 public class IndexEventSubsetJob {
 
@@ -83,13 +86,15 @@ public class IndexEventSubsetJob {
 
 		final Dataset<Event> subset = ClusterUtils
 			.readPath(spark, eventsPath, Event.class)
-			.groupByKey(e -> e.getTopic() + '@' + e.getMap().getTargetDatasourceId(), Encoders.STRING())
+			.groupByKey(
+				(MapFunction<Event, String>) e -> e.getTopic() + '@' + e.getMap().getTargetDatasourceId(),
+				Encoders.STRING())
 			.agg(aggr)
-			.map(t -> t._2, Encoders.bean(EventGroup.class))
+			.map((MapFunction<Tuple2<String, EventGroup>, EventGroup>) t -> t._2, Encoders.bean(EventGroup.class))
-			.flatMap(g -> g.getData().iterator(), Encoders.bean(Event.class));
+			.flatMap((FlatMapFunction<EventGroup, Event>) g -> g.getData().iterator(), Encoders.bean(Event.class));
 
 		final JavaRDD<String> inputRdd = subset
-			.map(e -> prepareEventForIndexing(e, now, total), Encoders.STRING())
+			.map((MapFunction<Event, String>) e -> prepareEventForIndexing(e, now, total), Encoders.STRING())
 			.javaRDD();
 
 		final Map<String, String> esCfg = new HashMap<>();

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/IndexNotificationsJob.java

@@ -18,7 +18,10 @@ import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;
 import org.apache.spark.SparkConf;
 import org.apache.spark.api.java.JavaRDD;
+import org.apache.spark.api.java.function.FlatMapFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Encoder;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.SparkSession;
 import org.apache.spark.util.LongAccumulator;
@@ -89,13 +92,17 @@ public class IndexNotificationsJob {
 		log.info("Number of subscriptions: " + subscriptions.size());
 
 		if (subscriptions.size() > 0) {
+			final Encoder<NotificationGroup> ngEncoder = Encoders.bean(NotificationGroup.class);
+			final Encoder<Notification> nEncoder = Encoders.bean(Notification.class);
 			final Dataset<Notification> notifications = ClusterUtils
 				.readPath(spark, eventsPath, Event.class)
-				.map(e -> generateNotifications(e, subscriptions, startTime), Encoders.bean(NotificationGroup.class))
+				.map(
-				.flatMap(g -> g.getData().iterator(), Encoders.bean(Notification.class));
+					(MapFunction<Event, NotificationGroup>) e -> generateNotifications(e, subscriptions, startTime),
+					ngEncoder)
+				.flatMap((FlatMapFunction<NotificationGroup, Notification>) g -> g.getData().iterator(), nEncoder);
 
 			final JavaRDD<String> inputRdd = notifications
-				.map(n -> prepareForIndexing(n, total), Encoders.STRING())
+				.map((MapFunction<Notification, String>) n -> prepareForIndexing(n, total), Encoders.STRING())
 				.javaRDD();
 
 			final Map<String, String> esCfg = new HashMap<>();
@@ -192,15 +199,11 @@ public class IndexNotificationsJob {
 			return false;
 		}
 
-		if (conditions.containsKey("targetSubjects")
+		return !conditions.containsKey("targetSubjects")
-			&& !conditions
+			|| conditions
 				.get("targetSubjects")
 				.stream()
-				.allMatch(c -> SubscriptionUtils.verifyListExact(map.getTargetSubjects(), c.getValue()))) {
+				.allMatch(c -> SubscriptionUtils.verifyListExact(map.getTargetSubjects(), c.getValue()));
-			return false;
-		}
-
-		return true;
 
 	}
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/JoinStep0Job.java

@@ -7,6 +7,7 @@ import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.TypedColumn;
@@ -67,9 +68,13 @@ public class JoinStep0Job {
 
 			final Dataset<OaBrokerMainEntity> dataset = sources
 				.joinWith(typedRels, sources.col("openaireId").equalTo(typedRels.col("source")), "left_outer")
-				.groupByKey(t -> t._1.getOpenaireId(), Encoders.STRING())
+				.groupByKey(
+					(MapFunction<Tuple2<OaBrokerMainEntity, RelatedDatasource>, String>) t -> t._1.getOpenaireId(),
+					Encoders.STRING())
 				.agg(aggr)
-				.map(t -> t._2, Encoders.bean(OaBrokerMainEntity.class));
+				.map(
+					(MapFunction<Tuple2<String, OaBrokerMainEntity>, OaBrokerMainEntity>) t -> t._2,
+					Encoders.bean(OaBrokerMainEntity.class));
 
 			ClusterUtils.save(dataset, joinedEntitiesPath, OaBrokerMainEntity.class, total);
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/JoinStep1Job.java

@@ -69,7 +69,9 @@ public class JoinStep1Job {
 					(MapFunction<Tuple2<OaBrokerMainEntity, RelatedProject>, String>) t -> t._1.getOpenaireId(),
 					Encoders.STRING())
 				.agg(aggr)
-				.map(t -> t._2, Encoders.bean(OaBrokerMainEntity.class));
+				.map(
+					(MapFunction<Tuple2<String, OaBrokerMainEntity>, OaBrokerMainEntity>) t -> t._2,
+					Encoders.bean(OaBrokerMainEntity.class));
 
 			ClusterUtils.save(dataset, joinedEntitiesPath, OaBrokerMainEntity.class, total);
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/JoinStep2Job.java

@@ -7,6 +7,7 @@ import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.TypedColumn;
@@ -64,9 +65,13 @@ public class JoinStep2Job {
 
 			final Dataset<OaBrokerMainEntity> dataset = sources
 				.joinWith(typedRels, sources.col("openaireId").equalTo(typedRels.col("source")), "left_outer")
-				.groupByKey(t -> t._1.getOpenaireId(), Encoders.STRING())
+				.groupByKey(
+					(MapFunction<Tuple2<OaBrokerMainEntity, RelatedSoftware>, String>) t -> t._1.getOpenaireId(),
+					Encoders.STRING())
 				.agg(aggr)
-				.map(t -> t._2, Encoders.bean(OaBrokerMainEntity.class));
+				.map(
+					(MapFunction<Tuple2<String, OaBrokerMainEntity>, OaBrokerMainEntity>) t -> t._2,
+					Encoders.bean(OaBrokerMainEntity.class));
 
 			ClusterUtils.save(dataset, joinedEntitiesPath, OaBrokerMainEntity.class, total);
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/JoinStep3Job.java

@@ -69,7 +69,9 @@ public class JoinStep3Job {
 					(MapFunction<Tuple2<OaBrokerMainEntity, RelatedDataset>, String>) t -> t._1.getOpenaireId(),
 					Encoders.STRING())
 				.agg(aggr)
-				.map(t -> t._2, Encoders.bean(OaBrokerMainEntity.class));
+				.map(
+					(MapFunction<Tuple2<String, OaBrokerMainEntity>, OaBrokerMainEntity>) t -> t._2,
+					Encoders.bean(OaBrokerMainEntity.class));
 
 			ClusterUtils.save(dataset, joinedEntitiesPath, OaBrokerMainEntity.class, total);
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/JoinStep4Job.java

@@ -69,7 +69,9 @@ public class JoinStep4Job {
 					(MapFunction<Tuple2<OaBrokerMainEntity, RelatedPublication>, String>) t -> t._1.getOpenaireId(),
 					Encoders.STRING())
 				.agg(aggr)
-				.map(t -> t._2, Encoders.bean(OaBrokerMainEntity.class));
+				.map(
+					(MapFunction<Tuple2<String, OaBrokerMainEntity>, OaBrokerMainEntity>) t -> t._2,
+					Encoders.bean(OaBrokerMainEntity.class));
 
 			ClusterUtils.save(dataset, joinedEntitiesPath, OaBrokerMainEntity.class, total);
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/PrepareGroupsJob.java

@@ -7,6 +7,7 @@ import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.FilterFunction;
 import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
@@ -64,7 +65,7 @@ public class PrepareGroupsJob {
 
 			final Dataset<Relation> mergedRels = ClusterUtils
 				.loadRelations(graphPath, spark)
-				.filter(r -> r.getRelClass().equals(BrokerConstants.IS_MERGED_IN_CLASS));
+				.filter((FilterFunction<Relation>) r -> r.getRelClass().equals(BrokerConstants.IS_MERGED_IN_CLASS));
 
 			final TypedColumn<Tuple2<OaBrokerMainEntity, Relation>, ResultGroup> aggr = new ResultAggregator()
 				.toColumn();
@@ -75,8 +76,9 @@ public class PrepareGroupsJob {
 					(MapFunction<Tuple2<OaBrokerMainEntity, Relation>, String>) t -> t._2.getTarget(),
 					Encoders.STRING())
 				.agg(aggr)
-				.map(t -> t._2, Encoders.bean(ResultGroup.class))
+				.map(
-				.filter(rg -> rg.getData().size() > 1);
+					(MapFunction<Tuple2<String, ResultGroup>, ResultGroup>) t -> t._2, Encoders.bean(ResultGroup.class))
+				.filter((FilterFunction<ResultGroup>) rg -> rg.getData().size() > 1);
 
 			ClusterUtils.save(dataset, groupsPath, ResultGroup.class, total);
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/PrepareRelatedDatasetsJob.java

@@ -7,6 +7,8 @@ import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.FilterFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.util.LongAccumulator;
@@ -20,6 +22,7 @@ import eu.dnetlib.dhp.broker.oa.util.ConversionUtils;
 import eu.dnetlib.dhp.broker.oa.util.aggregators.withRels.RelatedDataset;
 import eu.dnetlib.dhp.schema.common.ModelConstants;
 import eu.dnetlib.dhp.schema.oaf.Relation;
+import scala.Tuple2;
 
 public class PrepareRelatedDatasetsJob {
 
@@ -58,20 +61,22 @@ public class PrepareRelatedDatasetsJob {
 
 			final Dataset<OaBrokerRelatedDataset> datasets = ClusterUtils
 				.readPath(spark, graphPath + "/dataset", eu.dnetlib.dhp.schema.oaf.Dataset.class)
-				.filter(d -> !ClusterUtils.isDedupRoot(d.getId()))
+				.filter((FilterFunction<eu.dnetlib.dhp.schema.oaf.Dataset>) d -> !ClusterUtils.isDedupRoot(d.getId()))
-				.map(ConversionUtils::oafDatasetToBrokerDataset, Encoders.bean(OaBrokerRelatedDataset.class));
+				.map(
+					(MapFunction<eu.dnetlib.dhp.schema.oaf.Dataset, OaBrokerRelatedDataset>) ConversionUtils::oafDatasetToBrokerDataset,
+					Encoders.bean(OaBrokerRelatedDataset.class));
 
 			final Dataset<Relation> rels = ClusterUtils
 				.loadRelations(graphPath, spark)
-				.filter(r -> r.getDataInfo().getDeletedbyinference())
+				.filter((FilterFunction<Relation>) r -> r.getDataInfo().getDeletedbyinference())
-				.filter(r -> r.getRelType().equals(ModelConstants.RESULT_RESULT))
+				.filter((FilterFunction<Relation>) r -> r.getRelType().equals(ModelConstants.RESULT_RESULT))
-				.filter(r -> ClusterUtils.isValidResultResultClass(r.getRelClass()))
+				.filter((FilterFunction<Relation>) r -> ClusterUtils.isValidResultResultClass(r.getRelClass()))
-				.filter(r -> !ClusterUtils.isDedupRoot(r.getSource()))
+				.filter((FilterFunction<Relation>) r -> !ClusterUtils.isDedupRoot(r.getSource()))
-				.filter(r -> !ClusterUtils.isDedupRoot(r.getTarget()));
+				.filter((FilterFunction<Relation>) r -> !ClusterUtils.isDedupRoot(r.getTarget()));
 
 			final Dataset<RelatedDataset> dataset = rels
 				.joinWith(datasets, datasets.col("openaireId").equalTo(rels.col("target")), "inner")
-				.map(t -> {
+				.map((MapFunction<Tuple2<Relation, OaBrokerRelatedDataset>, RelatedDataset>) t -> {
 					final RelatedDataset rel = new RelatedDataset(t._1.getSource(),
 						t._2);
 					rel.getRelDataset().setRelType(t._1.getRelClass());

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/PrepareRelatedDatasourcesJob.java

@@ -7,6 +7,9 @@ import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.FilterFunction;
+import org.apache.spark.api.java.function.FlatMapFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.SparkSession;
@@ -25,6 +28,7 @@ import eu.dnetlib.dhp.schema.oaf.OtherResearchProduct;
 import eu.dnetlib.dhp.schema.oaf.Publication;
 import eu.dnetlib.dhp.schema.oaf.Result;
 import eu.dnetlib.dhp.schema.oaf.Software;
+import scala.Tuple2;
 import scala.Tuple3;
 
 public class PrepareRelatedDatasourcesJob {
@@ -70,11 +74,14 @@ public class PrepareRelatedDatasourcesJob {
 
 			final Dataset<OaBrokerRelatedDatasource> datasources = ClusterUtils
 				.readPath(spark, graphPath + "/datasource", Datasource.class)
-				.map(ConversionUtils::oafDatasourceToBrokerDatasource, Encoders.bean(OaBrokerRelatedDatasource.class));
+				.map(
+					(MapFunction<Datasource, OaBrokerRelatedDatasource>) ConversionUtils::oafDatasourceToBrokerDatasource,
+					Encoders.bean(OaBrokerRelatedDatasource.class));
 
 			final Dataset<RelatedDatasource> dataset = rels
 				.joinWith(datasources, datasources.col("openaireId").equalTo(rels.col("_2")), "inner")
-				.map(t -> {
+				.map(
+					(MapFunction<Tuple2<Tuple3<String, String, String>, OaBrokerRelatedDatasource>, RelatedDatasource>) t -> {
 						final RelatedDatasource r = new RelatedDatasource();
 						r.setSource(t._1._1());
 						r.setRelDatasource(t._2);
@@ -88,19 +95,22 @@ public class PrepareRelatedDatasourcesJob {
 
 	}
 
-	private static final Dataset<Tuple3<String, String, String>> prepareResultTuples(final SparkSession spark,
+	private static final <T extends Result> Dataset<Tuple3<String, String, String>> prepareResultTuples(
+		final SparkSession spark,
 		final String graphPath,
-		final Class<? extends Result> sourceClass) {
+		final Class<T> sourceClass) {
 
 		return ClusterUtils
 			.readPath(spark, graphPath + "/" + sourceClass.getSimpleName().toLowerCase(), sourceClass)
-			.filter(r -> !ClusterUtils.isDedupRoot(r.getId()))
+			.filter((FilterFunction<T>) r -> !ClusterUtils.isDedupRoot(r.getId()))
-			.filter(r -> r.getDataInfo().getDeletedbyinference())
+			.filter((FilterFunction<T>) r -> r.getDataInfo().getDeletedbyinference())
 			.map(
-				r -> DatasourceRelationsAccumulator.calculateTuples(r),
+				(MapFunction<T, DatasourceRelationsAccumulator>) r -> DatasourceRelationsAccumulator.calculateTuples(r),
 				Encoders.bean(DatasourceRelationsAccumulator.class))
 			.flatMap(
-				acc -> acc.getRels().iterator(),
+				(FlatMapFunction<DatasourceRelationsAccumulator, Tuple3<String, String, String>>) acc -> acc
+					.getRels()
+					.iterator(),
 				Encoders.tuple(Encoders.STRING(), Encoders.STRING(), Encoders.STRING()));
 	}
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/PrepareRelatedProjectsJob.java

@@ -7,6 +7,8 @@ import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.FilterFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.util.LongAccumulator;
@@ -22,6 +24,7 @@ import eu.dnetlib.dhp.broker.oa.util.aggregators.withRels.RelatedProject;
 import eu.dnetlib.dhp.schema.common.ModelConstants;
 import eu.dnetlib.dhp.schema.oaf.Project;
 import eu.dnetlib.dhp.schema.oaf.Relation;
+import scala.Tuple2;
 
 public class PrepareRelatedProjectsJob {
 
@@ -60,20 +63,25 @@ public class PrepareRelatedProjectsJob {
 
 			final Dataset<OaBrokerProject> projects = ClusterUtils
 				.readPath(spark, graphPath + "/project", Project.class)
-				.filter(p -> !ClusterUtils.isDedupRoot(p.getId()))
+				.filter((FilterFunction<Project>) p -> !ClusterUtils.isDedupRoot(p.getId()))
-				.map(ConversionUtils::oafProjectToBrokerProject, Encoders.bean(OaBrokerProject.class));
+				.map(
+					(MapFunction<Project, OaBrokerProject>) ConversionUtils::oafProjectToBrokerProject,
+					Encoders.bean(OaBrokerProject.class));
 
 			final Dataset<Relation> rels = ClusterUtils
 				.loadRelations(graphPath, spark)
-				.filter(r -> r.getDataInfo().getDeletedbyinference())
+				.filter((FilterFunction<Relation>) r -> r.getDataInfo().getDeletedbyinference())
-				.filter(r -> r.getRelType().equals(ModelConstants.RESULT_PROJECT))
+				.filter((FilterFunction<Relation>) r -> r.getRelType().equals(ModelConstants.RESULT_PROJECT))
-				.filter(r -> !r.getRelClass().equals(BrokerConstants.IS_MERGED_IN_CLASS))
+				.filter((FilterFunction<Relation>) r -> !r.getRelClass().equals(BrokerConstants.IS_MERGED_IN_CLASS))
-				.filter(r -> !ClusterUtils.isDedupRoot(r.getSource()))
+				.filter((FilterFunction<Relation>) r -> !ClusterUtils.isDedupRoot(r.getSource()))
-				.filter(r -> !ClusterUtils.isDedupRoot(r.getTarget()));
+				.filter((FilterFunction<Relation>) r -> !ClusterUtils.isDedupRoot(r.getTarget()));
 
 			final Dataset<RelatedProject> dataset = rels
 				.joinWith(projects, projects.col("openaireId").equalTo(rels.col("target")), "inner")
-				.map(t -> new RelatedProject(t._1.getSource(), t._2), Encoders.bean(RelatedProject.class));
+				.map(
+					(MapFunction<Tuple2<Relation, OaBrokerProject>, RelatedProject>) t -> new RelatedProject(
+						t._1.getSource(), t._2),
+					Encoders.bean(RelatedProject.class));
 
 			ClusterUtils.save(dataset, relsPath, RelatedProject.class, total);
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/PrepareRelatedPublicationsJob.java

@@ -7,6 +7,8 @@ import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.FilterFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.util.LongAccumulator;
@@ -21,6 +23,7 @@ import eu.dnetlib.dhp.broker.oa.util.aggregators.withRels.RelatedPublication;
 import eu.dnetlib.dhp.schema.common.ModelConstants;
 import eu.dnetlib.dhp.schema.oaf.Publication;
 import eu.dnetlib.dhp.schema.oaf.Relation;
+import scala.Tuple2;
 
 public class PrepareRelatedPublicationsJob {
 
@@ -59,22 +62,22 @@ public class PrepareRelatedPublicationsJob {
 
 			final Dataset<OaBrokerRelatedPublication> pubs = ClusterUtils
 				.readPath(spark, graphPath + "/publication", Publication.class)
-				.filter(p -> !ClusterUtils.isDedupRoot(p.getId()))
+				.filter((FilterFunction<Publication>) p -> !ClusterUtils.isDedupRoot(p.getId()))
 				.map(
-					ConversionUtils::oafPublicationToBrokerPublication,
+					(MapFunction<Publication, OaBrokerRelatedPublication>) ConversionUtils::oafPublicationToBrokerPublication,
 					Encoders.bean(OaBrokerRelatedPublication.class));
 
 			final Dataset<Relation> rels = ClusterUtils
 				.loadRelations(graphPath, spark)
-				.filter(r -> r.getDataInfo().getDeletedbyinference())
+				.filter((FilterFunction<Relation>) r -> r.getDataInfo().getDeletedbyinference())
-				.filter(r -> r.getRelType().equals(ModelConstants.RESULT_RESULT))
+				.filter((FilterFunction<Relation>) r -> r.getRelType().equals(ModelConstants.RESULT_RESULT))
-				.filter(r -> ClusterUtils.isValidResultResultClass(r.getRelClass()))
+				.filter((FilterFunction<Relation>) r -> ClusterUtils.isValidResultResultClass(r.getRelClass()))
-				.filter(r -> !ClusterUtils.isDedupRoot(r.getSource()))
+				.filter((FilterFunction<Relation>) r -> !ClusterUtils.isDedupRoot(r.getSource()))
-				.filter(r -> !ClusterUtils.isDedupRoot(r.getTarget()));
+				.filter((FilterFunction<Relation>) r -> !ClusterUtils.isDedupRoot(r.getTarget()));
 
 			final Dataset<RelatedPublication> dataset = rels
 				.joinWith(pubs, pubs.col("openaireId").equalTo(rels.col("target")), "inner")
-				.map(t -> {
+				.map((MapFunction<Tuple2<Relation, OaBrokerRelatedPublication>, RelatedPublication>) t -> {
 					final RelatedPublication rel = new RelatedPublication(
 						t._1.getSource(), t._2);
 					rel.getRelPublication().setRelType(t._1.getRelClass());

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/PrepareRelatedSoftwaresJob.java

@@ -7,7 +7,10 @@ import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.FilterFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Encoder;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.util.LongAccumulator;
 import org.slf4j.Logger;
@@ -22,6 +25,7 @@ import eu.dnetlib.dhp.broker.oa.util.aggregators.withRels.RelatedSoftware;
 import eu.dnetlib.dhp.schema.common.ModelConstants;
 import eu.dnetlib.dhp.schema.oaf.Relation;
 import eu.dnetlib.dhp.schema.oaf.Software;
+import scala.Tuple2;
 
 public class PrepareRelatedSoftwaresJob {
 
@@ -58,22 +62,30 @@ public class PrepareRelatedSoftwaresJob {
 
 			final LongAccumulator total = spark.sparkContext().longAccumulator("total_rels");
 
+			final Encoder<OaBrokerRelatedSoftware> obrsEncoder = Encoders.bean(OaBrokerRelatedSoftware.class);
 			final Dataset<OaBrokerRelatedSoftware> softwares = ClusterUtils
 				.readPath(spark, graphPath + "/software", Software.class)
-				.filter(sw -> !ClusterUtils.isDedupRoot(sw.getId()))
+				.filter((FilterFunction<Software>) sw -> !ClusterUtils.isDedupRoot(sw.getId()))
-				.map(ConversionUtils::oafSoftwareToBrokerSoftware, Encoders.bean(OaBrokerRelatedSoftware.class));
+				.map(
+					(MapFunction<Software, OaBrokerRelatedSoftware>) ConversionUtils::oafSoftwareToBrokerSoftware,
+					obrsEncoder);
 
-			final Dataset<Relation> rels = ClusterUtils
+			final Dataset<Relation> rels;
+			rels = ClusterUtils
 				.loadRelations(graphPath, spark)
-				.filter(r -> r.getDataInfo().getDeletedbyinference())
+				.filter((FilterFunction<Relation>) r -> r.getDataInfo().getDeletedbyinference())
-				.filter(r -> r.getRelType().equals(ModelConstants.RESULT_RESULT))
+				.filter((FilterFunction<Relation>) r -> r.getRelType().equals(ModelConstants.RESULT_RESULT))
-				.filter(r -> !r.getRelClass().equals(BrokerConstants.IS_MERGED_IN_CLASS))
+				.filter((FilterFunction<Relation>) r -> !r.getRelClass().equals(BrokerConstants.IS_MERGED_IN_CLASS))
-				.filter(r -> !ClusterUtils.isDedupRoot(r.getSource()))
+				.filter((FilterFunction<Relation>) r -> !ClusterUtils.isDedupRoot(r.getSource()))
-				.filter(r -> !ClusterUtils.isDedupRoot(r.getTarget()));
+				.filter((FilterFunction<Relation>) r -> !ClusterUtils.isDedupRoot(r.getTarget()));
 
+			final Encoder<RelatedSoftware> rsEncoder = Encoders.bean(RelatedSoftware.class);
 			final Dataset<RelatedSoftware> dataset = rels
 				.joinWith(softwares, softwares.col("openaireId").equalTo(rels.col("target")), "inner")
-				.map(t -> new RelatedSoftware(t._1.getSource(), t._2), Encoders.bean(RelatedSoftware.class));
+				.map(
+					(MapFunction<Tuple2<Relation, OaBrokerRelatedSoftware>, RelatedSoftware>) t -> new RelatedSoftware(
+						t._1.getSource(), t._2),
+					rsEncoder);
 
 			ClusterUtils.save(dataset, relsPath, RelatedSoftware.class, total);
 

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/PrepareSimpleEntititiesJob.java

@@ -7,7 +7,10 @@ import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.FilterFunction;
+import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Encoder;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.SparkSession;
 import org.apache.spark.util.LongAccumulator;
@@ -73,11 +76,12 @@ public class PrepareSimpleEntititiesJob {
 		final String graphPath,
 		final Class<SRC> sourceClass) {
 
+		final Encoder<OaBrokerMainEntity> encoder = Encoders.bean(OaBrokerMainEntity.class);
 		return ClusterUtils
 			.readPath(spark, graphPath + "/" + sourceClass.getSimpleName().toLowerCase(), sourceClass)
-			.filter(r -> !ClusterUtils.isDedupRoot(r.getId()))
+			.filter((FilterFunction<SRC>) r -> !ClusterUtils.isDedupRoot(r.getId()))
-			.filter(r -> r.getDataInfo().getDeletedbyinference())
+			.filter((FilterFunction<SRC>) r -> r.getDataInfo().getDeletedbyinference())
-			.map(ConversionUtils::oafResultToBrokerResult, Encoders.bean(OaBrokerMainEntity.class));
+			.map((MapFunction<SRC, OaBrokerMainEntity>) ConversionUtils::oafResultToBrokerResult, encoder);
 	}
 
 }

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/util/ClusterUtils.java

@@ -34,7 +34,7 @@ public class ClusterUtils {
 	public static Dataset<Relation> loadRelations(final String graphPath, final SparkSession spark) {
 		return ClusterUtils
 			.readPath(spark, graphPath + "/relation", Relation.class)
-			.map(r -> {
+			.map((MapFunction<Relation, Relation>) r -> {
 				r.setSource(ConversionUtils.cleanOpenaireId(r.getSource()));
 				r.setTarget(ConversionUtils.cleanOpenaireId(r.getTarget()));
 				return r;
@@ -75,7 +75,7 @@ public class ClusterUtils {
 		final Class<T> clazz,
 		final LongAccumulator acc) {
 		dataset
-			.map(o -> ClusterUtils.incrementAccumulator(o, acc), Encoders.bean(clazz))
+			.map((MapFunction<T, T>) o -> ClusterUtils.incrementAccumulator(o, acc), Encoders.bean(clazz))
 			.write()
 			.mode(SaveMode.Overwrite)
 			.option("compression", "gzip")

dhp-workflows/dhp-broker-events/src/main/java/eu/dnetlib/dhp/broker/oa/util/UpdateInfo.java

@@ -105,7 +105,6 @@ public final class UpdateInfo<T> {
 			.map(OaBrokerInstance::getUrl)
 			.findFirst()
 			.orElse(null);
-		;
 
 		final OaBrokerProvenance provenance = new OaBrokerProvenance(provId, provRepo, provType, provUrl);
 

dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/GroupEntitiesSparkJob.java

@@ -44,7 +44,7 @@ public class GroupEntitiesSparkJob {
 
 	private final static String ID_JPATH = "$.id";
 
-	private static ObjectMapper OBJECT_MAPPER = new ObjectMapper()
+	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
 		.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 
 	public static void main(String[] args) throws Exception {

dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/RelationAggregator.java

@@ -11,7 +11,7 @@ import eu.dnetlib.dhp.schema.oaf.Relation;
 
 public class RelationAggregator extends Aggregator<Relation, Relation, Relation> {
 
-	private static Relation ZERO = new Relation();
+	private static final Relation ZERO = new Relation();
 
 	@Override
 	public Relation zero() {

dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/SparkPropagateRelation.java

@@ -161,7 +161,7 @@ public class SparkPropagateRelation extends AbstractSparkAction {
 	}
 
 	private FilterFunction<Relation> getRelationFilterFunction() {
-		return (FilterFunction<Relation>) r -> StringUtils.isNotBlank(r.getSource()) ||
+		return r -> StringUtils.isNotBlank(r.getSource()) ||
 			StringUtils.isNotBlank(r.getTarget()) ||
 			StringUtils.isNotBlank(r.getRelClass()) ||
 			StringUtils.isNotBlank(r.getSubRelType()) ||

dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/EntityMergerTest.java

@@ -30,7 +30,7 @@ public class EntityMergerTest implements Serializable {
 
 	private String testEntityBasePath;
 	private DataInfo dataInfo;
-	private String dedupId = "00|dedup_id::1";
+	private final String dedupId = "00|dedup_id::1";
 	private Publication pub_top;
 
 	@BeforeEach

dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/IdGeneratorTest.java

@@ -30,7 +30,7 @@ import scala.Tuple2;
 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
 public class IdGeneratorTest {
 
-	private static ObjectMapper OBJECT_MAPPER = new ObjectMapper()
+	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
 		.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 
 	private static List<Identifier<Publication>> bestIds;

dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/SparkOpenorgsDedupTest.java

@@ -44,10 +44,10 @@ import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpService;
 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
 public class SparkOpenorgsDedupTest implements Serializable {
 
-	private static String dbUrl = "jdbc:h2:mem:openorgs_test;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false";
+	private static final String dbUrl = "jdbc:h2:mem:openorgs_test;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false";
-	private static String dbUser = "sa";
+	private static final String dbUser = "sa";
-	private static String dbTable = "tmp_dedup_events";
+	private static final String dbTable = "tmp_dedup_events";
-	private static String dbPwd = "";
+	private static final String dbPwd = "";
 
 	@Mock(serializable = true)
 	ISLookUpService isLookUpService;

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/crossref/CrossrefImporter.java

@@ -101,9 +101,8 @@ public class CrossrefImporter {
 				int size = decompresser.inflate(buffer);
 				bos.write(buffer, 0, size);
 			}
-			byte[] unzippeddata = bos.toByteArray();
 			decompresser.end();
-			return new String(unzippeddata);
+			return bos.toString();
 		} catch (Throwable e) {
 			throw new RuntimeException("Wrong record:" + blob, e);
 		}

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/ActivitiesDecompressor.java

@@ -113,7 +113,7 @@ public class ActivitiesDecompressor {
 								}
 
 							} else {
-								Log.warn("Data not retrievable [" + entry.getName() + "] " + buffer.toString());
+								Log.warn("Data not retrievable [" + entry.getName() + "] " + buffer);
 								xmlParserErrorFound += 1;
 							}
 						}

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/ExtractXMLActivitiesData.java

@@ -16,13 +16,13 @@ public class ExtractXMLActivitiesData extends OrcidDSManager {
 	private String outputWorksPath;
 	private String activitiesFileNameTarGz;
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		ExtractXMLActivitiesData extractXMLActivitiesData = new ExtractXMLActivitiesData();
 		extractXMLActivitiesData.loadArgs(args);
 		extractXMLActivitiesData.extractWorks();
 	}
 
-	private void loadArgs(String[] args) throws IOException, Exception {
+	private void loadArgs(String[] args) throws Exception {
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
 			IOUtils
 				.toString(

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/ExtractXMLSummariesData.java

@@ -17,13 +17,13 @@ public class ExtractXMLSummariesData extends OrcidDSManager {
 	private String outputAuthorsPath;
 	private String summariesFileNameTarGz;
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		ExtractXMLSummariesData extractXMLSummariesData = new ExtractXMLSummariesData();
 		extractXMLSummariesData.loadArgs(args);
 		extractXMLSummariesData.extractAuthors();
 	}
 
-	private void loadArgs(String[] args) throws IOException, Exception {
+	private void loadArgs(String[] args) throws Exception {
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
 			IOUtils
 				.toString(

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/OrcidAuthorsDOIsDataGen.java

@@ -16,7 +16,7 @@ public class OrcidAuthorsDOIsDataGen extends OrcidDSManager {
 	private String activitiesFileNameTarGz;
 	private String outputAuthorsDOIsPath;
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		OrcidAuthorsDOIsDataGen orcidAuthorsDOIsDataGen = new OrcidAuthorsDOIsDataGen();
 		orcidAuthorsDOIsDataGen.loadArgs(args);
 		orcidAuthorsDOIsDataGen.generateAuthorsDOIsData();
@@ -30,7 +30,7 @@ public class OrcidAuthorsDOIsDataGen extends OrcidDSManager {
 		ActivitiesDecompressor.parseGzActivities(conf, tarGzUri, outputPath);
 	}
 
-	private void loadArgs(String[] args) throws IOException, Exception {
+	private void loadArgs(String[] args) throws Exception {
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
 			IOUtils
 				.toString(

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/OrcidDSManager.java

@@ -19,7 +19,7 @@ public class OrcidDSManager {
 	private String summariesFileNameTarGz;
 	private String outputAuthorsPath;
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		OrcidDSManager orcidDSManager = new OrcidDSManager();
 		orcidDSManager.loadArgs(args);
 		orcidDSManager.generateAuthors();
@@ -56,7 +56,7 @@ public class OrcidDSManager {
 		return fs;
 	}
 
-	private void loadArgs(String[] args) throws IOException, Exception {
+	private void loadArgs(String[] args) throws Exception {
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
 			IOUtils
 				.toString(

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkDownloadOrcidWorks.java

@@ -46,7 +46,7 @@ public class SparkDownloadOrcidWorks {
 	public static final DateTimeFormatter ORCID_XML_DATETIMEFORMATTER = DateTimeFormatter
 		.ofPattern(ORCID_XML_DATETIME_FORMAT);
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
 			IOUtils
@@ -246,6 +246,6 @@ public class SparkDownloadOrcidWorks {
 				return name.getAsString();
 			}
 		}
-		return new String("");
+		return "";
 	}
 }

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkGenLastModifiedSeq.java

@@ -33,7 +33,7 @@ public class SparkGenLastModifiedSeq {
 	private static String outputPath;
 	private static String lambdaFileName;
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
 			IOUtils
 				.toString(

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkGenerateDoiAuthorList.java

@@ -36,7 +36,7 @@ import scala.Tuple2;
 
 public class SparkGenerateDoiAuthorList {
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		Logger logger = LoggerFactory.getLogger(SparkGenerateDoiAuthorList.class);
 		logger.info("[ SparkGenerateDoiAuthorList STARTED]");
 

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkUpdateOrcidAuthors.java

@@ -38,7 +38,7 @@ public class SparkUpdateOrcidAuthors {
 	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
 		.setSerializationInclusion(JsonInclude.Include.NON_NULL);
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		Logger logger = LoggerFactory.getLogger(SparkUpdateOrcidAuthors.class);
 
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
@@ -204,7 +204,7 @@ public class SparkUpdateOrcidAuthors {
 								a -> a._1().equals(authorSummary.getAuthorData().getOid()) &&
 									a._2().equals(authorSummary.getDownloadDate()))
 							.count() == 1;
-						return (oidFound && tsFound) || (!oidFound);
+						return !oidFound || tsFound;
 					});
 
 				Dataset<AuthorSummary> cleanedDS = spark

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkUpdateOrcidDatasets.java

@@ -38,7 +38,7 @@ public class SparkUpdateOrcidDatasets {
 	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
 		.setSerializationInclusion(JsonInclude.Include.NON_NULL);
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		Logger logger = LoggerFactory.getLogger(SparkUpdateOrcidDatasets.class);
 
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkUpdateOrcidWorks.java

@@ -35,7 +35,7 @@ public class SparkUpdateOrcidWorks {
 	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
 		.setSerializationInclusion(JsonInclude.Include.NON_NULL);
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		Logger logger = LoggerFactory.getLogger(SparkUpdateOrcidWorks.class);
 
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SummariesDecompressor.java

@@ -124,7 +124,7 @@ public class SummariesDecompressor {
 								}
 
 							} else {
-								Log.warn("Data not retrievable [" + entry.getName() + "] " + buffer.toString());
+								Log.warn("Data not retrievable [" + entry.getName() + "] " + buffer);
 								xmlParserErrorFound += 1;
 							}
 						}

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/util/HDFSUtil.java

@@ -35,7 +35,7 @@ public class HDFSUtil {
 		if (!fileSystem.exists(toReadPath)) {
 			throw new RuntimeException("File not exist: " + path);
 		}
-		logger.info("Last_update_path " + toReadPath.toString());
+		logger.info("Last_update_path " + toReadPath);
 		FSDataInputStream inputStream = new FSDataInputStream(fileSystem.open(toReadPath));
 		BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
 		StringBuffer sb = new StringBuffer();
@@ -60,7 +60,7 @@ public class HDFSUtil {
 			fileSystem.delete(toWritePath, true);
 		}
 		FSDataOutputStream os = fileSystem.create(toWritePath);
-		BufferedWriter br = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
+		BufferedWriter br = new BufferedWriter(new OutputStreamWriter(os, StandardCharsets.UTF_8));
 		br.write(text);
 		br.close();
 	}

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/xml/XMLRecordParser.java

@@ -39,7 +39,7 @@ public class XMLRecordParser {
 	private static final String NS_ERROR = "error";
 
 	public static AuthorData VTDParseAuthorData(byte[] bytes)
-		throws VtdException, EncodingException, EOFException, EntityException, ParseException {
+		throws VtdException, ParseException {
 		final VTDGen vg = new VTDGen();
 		vg.setDoc(bytes);
 		vg.parse(true);
@@ -134,7 +134,7 @@ public class XMLRecordParser {
 	}
 
 	public static WorkData VTDParseWorkData(byte[] bytes)
-		throws VtdException, EncodingException, EOFException, EntityException, ParseException {
+		throws VtdException, ParseException {
 		final VTDGen vg = new VTDGen();
 		vg.setDoc(bytes);
 		vg.parse(true);

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcidnodoi/ActivitiesDumpReader.java

@@ -123,7 +123,7 @@ public class ActivitiesDumpReader {
 								}
 
 							} else {
-								Log.warn("Data not retrievable [" + entry.getName() + "] " + buffer.toString());
+								Log.warn("Data not retrievable [" + entry.getName() + "] " + buffer);
 								xmlParserErrorFound += 1;
 							}
 						}

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcidnodoi/GenOrcidAuthorWork.java

@@ -22,7 +22,7 @@ public class GenOrcidAuthorWork extends OrcidDSManager {
 	private String activitiesFileNameTarGz;
 	private String outputWorksPath;
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 		GenOrcidAuthorWork genOrcidAuthorWork = new GenOrcidAuthorWork();
 		genOrcidAuthorWork.loadArgs(args);
 		genOrcidAuthorWork.generateAuthorsDOIsData();
@@ -36,7 +36,7 @@ public class GenOrcidAuthorWork extends OrcidDSManager {
 		ActivitiesDumpReader.parseGzActivities(conf, tarGzUri, outputPath);
 	}
 
-	private void loadArgs(String[] args) throws IOException, Exception {
+	private void loadArgs(String[] args) throws Exception {
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
 			IOUtils
 				.toString(

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcidnodoi/SparkGenEnrichedOrcidWorks.java

@@ -52,7 +52,7 @@ public class SparkGenEnrichedOrcidWorks {
 
 	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
 			IOUtils
@@ -169,7 +169,7 @@ public class SparkGenEnrichedOrcidWorks {
 				oafPublicationRDD
 					.mapToPair(
 						p -> new Tuple2<>(p.getClass().toString(),
-							OBJECT_MAPPER.writeValueAsString(new AtomicAction<>(Publication.class, (Publication) p))))
+							OBJECT_MAPPER.writeValueAsString(new AtomicAction<>(Publication.class, p))))
 					.mapToPair(t -> new Tuple2(new Text(t._1()), new Text(t._2())))
 					.saveAsNewAPIHadoopFile(
 						workingPath.concat(outputEnrichedWorksPath),

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcidnodoi/json/JsonWriter.java

@@ -16,7 +16,7 @@ import eu.dnetlib.doiboost.orcid.model.WorkData;
 public class JsonWriter {
 
 	public static final com.fasterxml.jackson.databind.ObjectMapper OBJECT_MAPPER = new ObjectMapper()
-		.setSerializationInclusion(JsonInclude.Include.NON_NULL);;
+		.setSerializationInclusion(JsonInclude.Include.NON_NULL);
 
 	public static String create(AuthorData authorData) throws JsonProcessingException {
 		return OBJECT_MAPPER.writeValueAsString(authorData);

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcidnodoi/oaf/PublicationToOaf.java

@@ -88,7 +88,7 @@ public class PublicationToOaf implements Serializable {
 		this.dateOfCollection = null;
 	}
 
-	private static Map<String, Pair<String, String>> datasources = new HashMap<String, Pair<String, String>>() {
+	private static final Map<String, Pair<String, String>> datasources = new HashMap<String, Pair<String, String>>() {
 
 		{
 			put(
@@ -99,7 +99,7 @@ public class PublicationToOaf implements Serializable {
 	};
 
 	// json external id will be mapped to oaf:pid/@classid Map to oaf:pid/@classname
-	private static Map<String, Pair<String, String>> externalIds = new HashMap<String, Pair<String, String>>() {
+	private static final Map<String, Pair<String, String>> externalIds = new HashMap<String, Pair<String, String>>() {
 
 		{
 			put("ark".toLowerCase(), new Pair<>("ark", "ark"));
@@ -529,9 +529,7 @@ public class PublicationToOaf implements Serializable {
 			if (jsonArray.isJsonNull()) {
 				return false;
 			}
-			if (jsonArray.get(0).isJsonNull()) {
+			return !jsonArray.get(0).isJsonNull();
-				return false;
-			}
 		}
 		return true;
 	}

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcidnodoi/similarity/AuthorMatcher.java

@@ -142,7 +142,7 @@ public class AuthorMatcher {
 
 	public static String normalize(final String s) {
 		if (s == null) {
-			return new String("");
+			return "";
 		}
 		return nfd(s)
 			.toLowerCase()
@@ -189,16 +189,13 @@ public class AuthorMatcher {
 	}
 
 	private static void updateRanks(List<Contributor> contributors) {
-		boolean seqFound = false;
+		boolean seqFound = contributors
-		if (contributors
 			.stream()
 			.filter(
 				c -> c.getRole() != null && c.getSequence() != null &&
 					c.getRole().equals("author") && (c.getSequence().equals("first") ||
 						c.getSequence().equals("additional")))
-			.count() > 0) {
+			.count() > 0;
-			seqFound = true;
-		}
 		if (!seqFound) {
 			List<Integer> seqIds = Arrays.asList(0);
 			contributors.forEach(c -> {

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcidnodoi/util/DumpToActionsUtility.java

@@ -20,7 +20,7 @@ public class DumpToActionsUtility {
 	public static String getStringValue(final JsonObject root, final String key) {
 		if (root.has(key) && !root.get(key).isJsonNull())
 			return root.get(key).getAsString();
-		return new String("");
+		return "";
 	}
 
 	public static List<String> getArrayValues(final JsonObject root, final String key) {

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcidnodoi/util/Pair.java

@@ -3,9 +3,9 @@ package eu.dnetlib.doiboost.orcidnodoi.util;
 
 public class Pair<K, V> {
 
-	private K k;
+	private final K k;
 
-	private V v;
+	private final V v;
 
 	public Pair(K k, V v) {
 		this.k = k;

dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcidnodoi/xml/XMLRecordParserNoDoi.java

@@ -43,7 +43,7 @@ public class XMLRecordParserNoDoi {
 	private static final String NS_ERROR = "error";
 
 	public static WorkDetail VTDParseWorkData(byte[] bytes)
-		throws VtdException, EncodingException, EOFException, EntityException, ParseException, XPathParseException,
+		throws VtdException, ParseException, XPathParseException,
 		NavException, XPathEvalException {
 		final VTDGen vg = new VTDGen();
 		vg.setDoc(bytes);

dhp-workflows/dhp-doiboost/src/test/java/eu/dnetlib/doiboost/orcid/OrcidClientTest.java

@@ -83,7 +83,7 @@ public class OrcidClientTest {
 		} catch (Throwable e) {
 			e.printStackTrace();
 		}
-		return new String("");
+		return "";
 	}
 
 	// @Test
@@ -142,7 +142,7 @@ public class OrcidClientTest {
 	}
 
 	private void testDate(String value) throws ParseException {
-		System.out.println(value.toString());
+		System.out.println(value);
 		if (value.length() != 19) {
 			value = value.substring(0, 19);
 		}
@@ -185,7 +185,7 @@ public class OrcidClientTest {
 			br = new BufferedReader(new InputStreamReader(input)); // Read directly from tarInput
 			String line;
 			while ((line = br.readLine()) != null) {
-				String[] values = line.toString().split(",");
+				String[] values = line.split(",");
 				List<String> recordInfo = Arrays.asList(values);
 				assertTrue(recordInfo.size() == 4);
 				String orcid = recordInfo.get(0);
@@ -260,7 +260,7 @@ public class OrcidClientTest {
 		} catch (Throwable e) {
 			e.printStackTrace();
 		}
-		return new String("");
+		return "";
 	}
 
 	@Test

dhp-workflows/dhp-doiboost/src/test/java/eu/dnetlib/doiboost/orcid/xml/XMLRecordParserTest.java

@@ -44,7 +44,7 @@ public class XMLRecordParserTest {
 
 		XMLRecordParser p = new XMLRecordParser();
 
-		AuthorData authorData = p.VTDParseAuthorData(xml.getBytes());
+		AuthorData authorData = XMLRecordParser.VTDParseAuthorData(xml.getBytes());
 		assertNotNull(authorData);
 		assertNotNull(authorData.getName());
 		System.out.println("name: " + authorData.getName());
@@ -60,7 +60,7 @@ public class XMLRecordParserTest {
 
 		XMLRecordParser p = new XMLRecordParser();
 
-		AuthorData authorData = p.VTDParseAuthorData(xml.getBytes());
+		AuthorData authorData = XMLRecordParser.VTDParseAuthorData(xml.getBytes());
 		assertNotNull(authorData);
 		assertNotNull(authorData.getErrorCode());
 		System.out.println("error: " + authorData.getErrorCode());
@@ -75,7 +75,7 @@ public class XMLRecordParserTest {
 
 		XMLRecordParser p = new XMLRecordParser();
 
-		WorkData workData = p.VTDParseWorkData(xml.getBytes());
+		WorkData workData = XMLRecordParser.VTDParseWorkData(xml.getBytes());
 		assertNotNull(workData);
 		assertNotNull(workData.getOid());
 		System.out.println("oid: " + workData.getOid());

dhp-workflows/dhp-doiboost/src/test/java/eu/dnetlib/doiboost/orcidnodoi/xml/OrcidNoDoiTest.java

@@ -50,7 +50,7 @@ public class OrcidNoDoiTest {
 		}
 		WorkDetail workData = null;
 		try {
-			workData = p.VTDParseWorkData(xml.getBytes());
+			workData = XMLRecordParserNoDoi.VTDParseWorkData(xml.getBytes());
 		} catch (Exception e) {
 			logger.error("parsing xml", e);
 		}
@@ -107,7 +107,7 @@ public class OrcidNoDoiTest {
 		}
 		WorkDetail workData = null;
 		try {
-			workData = p.VTDParseWorkData(xml.getBytes());
+			workData = XMLRecordParserNoDoi.VTDParseWorkData(xml.getBytes());
 		} catch (Exception e) {
 			logger.error("parsing xml", e);
 		}
@@ -138,7 +138,7 @@ public class OrcidNoDoiTest {
 		}
 		WorkDetail workData = null;
 		try {
-			workData = p.VTDParseWorkData(xml.getBytes());
+			workData = XMLRecordParserNoDoi.VTDParseWorkData(xml.getBytes());
 		} catch (Exception e) {
 			logger.error("parsing xml", e);
 		}
@@ -181,7 +181,7 @@ public class OrcidNoDoiTest {
 		}
 		WorkDetail workData = null;
 		try {
-			workData = p.VTDParseWorkData(xml.getBytes());
+			workData = XMLRecordParserNoDoi.VTDParseWorkData(xml.getBytes());
 		} catch (Exception e) {
 			logger.error("parsing xml", e);
 		}
@@ -217,16 +217,16 @@ public class OrcidNoDoiTest {
 			.stream()
 			.filter(c -> !StringUtils.isBlank(c.getCreditName()))
 			.forEach(c -> {
-				if (am.simpleMatch(c.getCreditName(), author.getName()) ||
+				if (AuthorMatcher.simpleMatch(c.getCreditName(), author.getName()) ||
-					am.simpleMatch(c.getCreditName(), author.getSurname()) ||
+					AuthorMatcher.simpleMatch(c.getCreditName(), author.getSurname()) ||
-					am.simpleMatchOnOtherNames(c.getCreditName(), author.getOtherNames())) {
+					AuthorMatcher.simpleMatchOnOtherNames(c.getCreditName(), author.getOtherNames())) {
 					matchCounters.set(0, matchCounters.get(0) + 1);
 					c.setSimpleMatch(true);
 				}
 			});
 
 		assertTrue(matchCounters.get(0) == 1);
-		am.updateAuthorsSimpleMatch(contributors, author);
+		AuthorMatcher.updateAuthorsSimpleMatch(contributors, author);
 		assertTrue(contributors.get(0).getName().equals("Joe"));
 		assertTrue(contributors.get(0).getSurname().equals("Dodge"));
 		assertTrue(contributors.get(0).getCreditName().equals("Joe Dodge"));
@@ -249,9 +249,9 @@ public class OrcidNoDoiTest {
 			.stream()
 			.filter(c -> !StringUtils.isBlank(c.getCreditName()))
 			.forEach(c -> {
-				if (am.simpleMatch(c.getCreditName(), authorX.getName()) ||
+				if (AuthorMatcher.simpleMatch(c.getCreditName(), authorX.getName()) ||
-					am.simpleMatch(c.getCreditName(), authorX.getSurname()) ||
+					AuthorMatcher.simpleMatch(c.getCreditName(), authorX.getSurname()) ||
-					am.simpleMatchOnOtherNames(c.getCreditName(), author.getOtherNames())) {
+					AuthorMatcher.simpleMatchOnOtherNames(c.getCreditName(), author.getOtherNames())) {
 					int currentCounter = matchCounters2.get(0);
 					currentCounter += 1;
 					matchCounters2.set(0, currentCounter);
@@ -268,7 +268,7 @@ public class OrcidNoDoiTest {
 			.filter(c -> c.isSimpleMatch())
 			.filter(c -> !StringUtils.isBlank(c.getCreditName()))
 			.map(c -> {
-				c.setScore(am.bestMatch(authorX.getName(), authorX.getSurname(), c.getCreditName()));
+				c.setScore(AuthorMatcher.bestMatch(authorX.getName(), authorX.getSurname(), c.getCreditName()));
 				return c;
 			})
 			.filter(c -> c.getScore() >= AuthorMatcher.threshold)
@@ -280,7 +280,7 @@ public class OrcidNoDoiTest {
 		assertTrue(bestMatchContributor.getCreditName().equals("Abdel-Dayem Khai"));
 		assertTrue(contributorList.get(0).isBestMatch());
 		assertTrue(!contributorList.get(1).isBestMatch());
-		am.updateAuthorsSimilarityMatch(contributorList, authorX);
+		AuthorMatcher.updateAuthorsSimilarityMatch(contributorList, authorX);
 		assertTrue(contributorList.get(0).getName().equals(nameA));
 		assertTrue(contributorList.get(0).getSurname().equals(surnameA));
 		assertTrue(contributorList.get(0).getCreditName().equals("Abdel-Dayem Khai"));
@@ -310,7 +310,7 @@ public class OrcidNoDoiTest {
 		}
 		WorkDetail workData = null;
 		try {
-			workData = p.VTDParseWorkData(xml.getBytes());
+			workData = XMLRecordParserNoDoi.VTDParseWorkData(xml.getBytes());
 		} catch (Exception e) {
 			logger.error("parsing xml", e);
 		}
@@ -331,8 +331,8 @@ public class OrcidNoDoiTest {
 		author.setName("Joe");
 		author.setSurname("Dodge");
 		author.setOid("0000-1111-2222-3333");
-		String otherName1 = new String("Joe Dr. Dodge");
+		String otherName1 = "Joe Dr. Dodge";
-		String otherName2 = new String("XY");
+		String otherName2 = "XY";
 		List<String> others = Lists.newArrayList();
 		others.add(otherName1);
 		others.add(otherName2);

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/bulktag/SparkBulkTagJob.java

@@ -123,7 +123,7 @@ public class SparkBulkTagJob {
 
 	// TODO remove this hack as soon as the values fixed by this method will be provided as NON null
 	private static <R extends Result> MapFunction<R, R> patchResult() {
-		return (MapFunction<R, R>) r -> {
+		return r -> {
 			if (r.getDataInfo().getDeletedbyinference() == null) {
 				r.getDataInfo().setDeletedbyinference(false);
 			}

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/bulktag/community/CommunityConfigurationFactory.java

@@ -29,7 +29,7 @@ public class CommunityConfigurationFactory {
 
 	private static final Log log = LogFactory.getLog(CommunityConfigurationFactory.class);
 
-	private static VerbResolver resolver = VerbResolverFactory.newInstance();
+	private static final VerbResolver resolver = VerbResolverFactory.newInstance();
 
 	public static CommunityConfiguration newInstance(final String xml) throws DocumentException {
 
@@ -51,7 +51,7 @@ public class CommunityConfigurationFactory {
 		}
 
 		log.info(String.format("loaded %s community configuration profiles", communities.size()));
-		log.debug(String.format("loaded community configuration:\n%s", communities.toString()));
+		log.debug(String.format("loaded community configuration:\n%s", communities));
 
 		return new CommunityConfiguration(communities);
 	}

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/bulktag/criteria/VerbResolver.java

@@ -40,7 +40,7 @@ public class VerbResolver implements Serializable {
 								.getParameterValues()
 								.get(0)
 								.getValue(),
-							value -> (Class<Selection>) ((ClassInfo) value).loadClass()));
+							value -> (Class<Selection>) value.loadClass()));
 		} catch (Exception e) {
 			e.printStackTrace();
 		}

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/countrypropagation/SparkCountryPropagationJob.java

@@ -111,7 +111,7 @@ public class SparkCountryPropagationJob {
 	}
 
 	private static <R extends Result> MapFunction<Tuple2<R, ResultCountrySet>, R> getCountryMergeFn() {
-		return (MapFunction<Tuple2<R, ResultCountrySet>, R>) t -> {
+		return t -> {
 			Optional.ofNullable(t._2()).ifPresent(r -> {
 				t._1().getCountry().addAll(merge(t._1().getCountry(), r.getCountrySet()));
 			});

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/orcidtoresultfromsemrel/SparkOrcidToResultFromSemRelJob.java

@@ -105,7 +105,7 @@ public class SparkOrcidToResultFromSemRelJob {
 	}
 
 	private static <R extends Result> MapFunction<Tuple2<R, ResultOrcidList>, R> authorEnrichFn() {
-		return (MapFunction<Tuple2<R, ResultOrcidList>, R>) value -> {
+		return value -> {
 			R ret = value._1();
 			Optional<ResultOrcidList> rol = Optional.ofNullable(value._2());
 			if (rol.isPresent()) {
@@ -202,8 +202,8 @@ public class SparkOrcidToResultFromSemRelJob {
 			return false;
 		}
 		for (StructuredProperty pid : pids.get()) {
-			if (ModelConstants.ORCID_PENDING.equals(pid.getQualifier().getClassid().toLowerCase()) ||
+			if (ModelConstants.ORCID_PENDING.equalsIgnoreCase(pid.getQualifier().getClassid()) ||
-				ModelConstants.ORCID.equals(pid.getQualifier().getClassid().toLowerCase())) {
+				ModelConstants.ORCID.equalsIgnoreCase(pid.getQualifier().getClassid())) {
 				return true;
 			}
 		}

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/projecttoresult/SparkResultToProjectThroughSemRelJob.java

@@ -94,7 +94,7 @@ public class SparkResultToProjectThroughSemRelJob {
 	}
 
 	private static FlatMapFunction<Tuple2<ResultProjectSet, ResultProjectSet>, Relation> mapRelationRn() {
-		return (FlatMapFunction<Tuple2<ResultProjectSet, ResultProjectSet>, Relation>) value -> {
+		return value -> {
 			List<Relation> new_relations = new ArrayList<>();
 			ResultProjectSet potential_update = value._1();
 			Optional<ResultProjectSet> already_linked = Optional.ofNullable(value._2());

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/resulttocommunityfromorganization/PrepareResultCommunitySet.java

@@ -117,7 +117,7 @@ public class PrepareResultCommunitySet {
 
 	private static MapFunction<ResultOrganizations, ResultCommunityList> mapResultCommunityFn(
 		OrganizationMap organizationMap) {
-		return (MapFunction<ResultOrganizations, ResultCommunityList>) value -> {
+		return value -> {
 			String rId = value.getResultId();
 			Optional<List<String>> orgs = Optional.ofNullable(value.getMerges());
 			String oTarget = value.getOrgId();

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/resulttocommunityfromorganization/SparkResultToCommunityFromOrganizationJob.java

@@ -98,7 +98,7 @@ public class SparkResultToCommunityFromOrganizationJob {
 	}
 
 	private static <R extends Result> MapFunction<Tuple2<R, ResultCommunityList>, R> resultCommunityFn() {
-		return (MapFunction<Tuple2<R, ResultCommunityList>, R>) value -> {
+		return value -> {
 			R ret = value._1();
 			Optional<ResultCommunityList> rcl = Optional.ofNullable(value._2());
 			if (rcl.isPresent()) {

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/resulttocommunityfromsemrel/SparkResultToCommunityThroughSemRelJob.java

@@ -101,7 +101,7 @@ public class SparkResultToCommunityThroughSemRelJob {
 	}
 
 	private static <R extends Result> MapFunction<Tuple2<R, ResultCommunityList>, R> contextUpdaterFn() {
-		return (MapFunction<Tuple2<R, ResultCommunityList>, R>) value -> {
+		return value -> {
 			R ret = value._1();
 			Optional<ResultCommunityList> rcl = Optional.ofNullable(value._2());
 			if (rcl.isPresent()) {

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/resulttoorganizationfrominstrepo/SparkResultToOrganizationFromIstRepoJob.java

@@ -124,7 +124,7 @@ public class SparkResultToOrganizationFromIstRepoJob {
 	}
 
 	private static FlatMapFunction<Tuple2<ResultOrganizationSet, ResultOrganizationSet>, Relation> createRelationFn() {
-		return (FlatMapFunction<Tuple2<ResultOrganizationSet, ResultOrganizationSet>, Relation>) value -> {
+		return value -> {
 			List<Relation> new_relations = new ArrayList<>();
 			ResultOrganizationSet potential_update = value._1();
 			Optional<ResultOrganizationSet> already_linked = Optional.ofNullable(value._2());

dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/Constants.java

@@ -14,7 +14,7 @@ public class Constants {
 
 	public static final String HARVESTED = "Harvested";
 	public static final String DEFAULT_TRUST = "0.9";
-	public static final String USER_CLAIM = "Linked by user";;
+	public static final String USER_CLAIM = "Linked by user";
 
 	public static String COAR_ACCESS_RIGHT_SCHEMA = "http://vocabularies.coar-repositories.org/documentation/access_rights/";
 
@@ -44,7 +44,7 @@ public class Constants {
 	public enum DUMPTYPE {
 		COMPLETE("complete"), COMMUNITY("community"), FUNDER("funder");
 
-		private String type;
+		private final String type;
 
 		DUMPTYPE(String type) {
 			this.type = type;

dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/GraphHiveImporterJobTest.java

@@ -51,7 +51,7 @@ public class GraphHiveImporterJobTest {
 		conf
 			.set(
 				"javax.jdo.option.ConnectionURL",
-				String.format(JDBC_DERBY_TEMPLATE, workingDir.resolve("warehouse").toString()));
+				String.format(JDBC_DERBY_TEMPLATE, workingDir.resolve("warehouse")));
 
 		spark = SparkSession
 			.builder()

dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/DumpJobTest.java

@@ -40,7 +40,7 @@ public class DumpJobTest {
 
 	private static final Logger log = LoggerFactory.getLogger(DumpJobTest.class);
 
-	private static CommunityMap map = new CommunityMap();
+	private static final CommunityMap map = new CommunityMap();
 
 	static {
 		map.put("egi", "EGI Federation");

dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/PrepareResultProjectJobTest.java

@@ -37,7 +37,7 @@ public class PrepareResultProjectJobTest {
 	private static final Logger log = LoggerFactory
 		.getLogger(eu.dnetlib.dhp.oa.graph.dump.PrepareResultProjectJobTest.class);
 
-	private static HashMap<String, String> map = new HashMap<>();
+	private static final HashMap<String, String> map = new HashMap<>();
 
 	@BeforeAll
 	public static void beforeAll() throws IOException {

dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/UpdateProjectInfoTest.java

@@ -36,7 +36,7 @@ public class UpdateProjectInfoTest {
 
 	private static final Logger log = LoggerFactory.getLogger(eu.dnetlib.dhp.oa.graph.dump.UpdateProjectInfoTest.class);
 
-	private static HashMap<String, String> map = new HashMap<>();
+	private static final HashMap<String, String> map = new HashMap<>();
 
 	@BeforeAll
 	public static void beforeAll() throws IOException {

dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/complete/DumpOrganizationProjectDatasourceTest.java

@@ -37,7 +37,7 @@ public class DumpOrganizationProjectDatasourceTest {
 	private static final Logger log = LoggerFactory
 		.getLogger(DumpOrganizationProjectDatasourceTest.class);
 
-	private static HashMap<String, String> map = new HashMap<>();
+	private static final HashMap<String, String> map = new HashMap<>();
 
 	@BeforeAll
 	public static void beforeAll() throws IOException {

dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/complete/DumpRelationTest.java

@@ -36,7 +36,7 @@ public class DumpRelationTest {
 	private static final Logger log = LoggerFactory
 		.getLogger(DumpRelationTest.class);
 
-	private static HashMap<String, String> map = new HashMap<>();
+	private static final HashMap<String, String> map = new HashMap<>();
 
 	@BeforeAll
 	public static void beforeAll() throws IOException {

dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/complete/RelationFromOrganizationTest.java

@@ -33,7 +33,7 @@ public class RelationFromOrganizationTest {
 	private static final Logger log = LoggerFactory
 		.getLogger(RelationFromOrganizationTest.class);
 
-	private static HashMap<String, String> map = new HashMap<>();
+	private static final HashMap<String, String> map = new HashMap<>();
 
 	String organizationCommunityMap = "{\"20|grid________::afaa39865943381c51f76c08725ffa75\":[\"mes\",\"euromarine\"], \"20|corda__h2020::e8dbe14cca9bf6fce09d468872f813f8\":[\"mes\",\"euromarine\"], \"20|snsf________::9b253f265e3bef5cae6d881fdf61aceb\":[\"mes\",\"euromarine\"],\"20|rcuk________::e054eea0a47665af8c3656b5785ccf76\":[\"mes\",\"euromarine\"],\"20|corda__h2020::edc18d67c9b11fb616ca9f6e1db1b151\":[\"mes\",\"euromarine\"],\"20|rcuk________::d5736d9da90521ddcdc7828a05a85e9a\":[\"mes\",\"euromarine\"],\"20|corda__h2020::f5d418d3aa1cf817ddefcc3fdc039f27\":[\"mes\",\"euromarine\"],\"20|snsf________::8fa091f8f25a846779acb4ea97b50aef\":[\"mes\",\"euromarine\"],\"20|corda__h2020::81e020977211c2c40fae2e1a50bffd71\":[\"mes\",\"euromarine\"],\"20|corda_______::81e020977211c2c40fae2e1a50bffd71\":[\"mes\",\"euromarine\"],\"20|snsf________::31d0a100e54e3cdb3c6f52d91e638c78\":[\"mes\",\"euromarine\"],\"20|corda__h2020::ea379ef91b8cc86f9ac5edc4169292db\":[\"mes\",\"euromarine\"],\"20|corda__h2020::f75ee2ee48e5cb0ec8c8d30aaa8fef70\":[\"mes\",\"euromarine\"],\"20|rcuk________::e16010089551a1a9182a94604fc0ea59\":[\"mes\",\"euromarine\"],\"20|corda__h2020::38531a2cce7c5c347ffc439b07c1f43b\":[\"mes\",\"euromarine\"],\"20|corda_______::38531a2cce7c5c347ffc439b07c1f43b\":[\"mes\",\"euromarine\"],\"20|grid________::b2cbbf5eadbbf87d534b022bad3191d7\":[\"mes\",\"euromarine\"],\"20|snsf________::74730ef1439d7f7636a8be58a6b471b8\":[\"mes\",\"euromarine\"],\"20|nsf_________::ad72e19043a5a467e35f9b444d11563e\":[\"mes\",\"euromarine\"],\"20|rcuk________::0fc3e92500290902a2d38ec2445e74c3\":[\"mes\",\"euromarine\"],\"20|grid________::ad2c29905da0eb3c06b3fa80cacd89ea\":[\"mes\",\"euromarine\"],\"20|corda__h2020::30b53e4d63d3724f00acb9cbaca40860\":[\"mes\",\"euromarine\"],\"20|corda__h2020::f60f84bee14ad93f0db0e49af1d5c317\":[\"mes\",\"euromarine\"],  \"20|corda__h2020::7bf251ac3765b5e89d82270a1763d09f\":[\"mes\",\"euromarine\"],  \"20|corda__h2020::65531bd11be9935948c7f2f4db1c1832\":[\"mes\",\"euromarine\"],  \"20|corda__h2020::e0e98f86bbc76638bbb72a8fe2302946\":[\"mes\",\"euromarine\"],  \"20|snsf________::3eb43582ac27601459a8d8b3e195724b\":[\"mes\",\"euromarine\"],  \"20|corda__h2020::af2481dab65d06c8ea0ae02b5517b9b6\":[\"mes\",\"euromarine\"],  \"20|corda__h2020::c19d05cfde69a50d3ebc89bd0ee49929\":[\"mes\",\"euromarine\"],  \"20|corda__h2020::af0bfd9fc09f80d9488f56d71a9832f0\":[\"mes\",\"euromarine\"],  \"20|rcuk________::f33c02afb0dc66c49d0ed97ca5dd5cb0\":[\"beopen\"], "
 		+

dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/funderresult/ResultLinkedToProjectTest.java

@@ -36,7 +36,7 @@ public class ResultLinkedToProjectTest {
 	private static final Logger log = LoggerFactory
 		.getLogger(eu.dnetlib.dhp.oa.graph.dump.funderresult.ResultLinkedToProjectTest.class);
 
-	private static HashMap<String, String> map = new HashMap<>();
+	private static final HashMap<String, String> map = new HashMap<>();
 
 	@BeforeAll
 	public static void beforeAll() throws IOException {

dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/raw/MigrateDbEntitiesApplicationTest.java

@@ -347,7 +347,7 @@ public class MigrateDbEntitiesApplicationTest {
 	}
 
 	private List<String> getValueAsList(final String name, final List<TypedField> fields) {
-		return (List<String>) getValueAs(name, fields);
+		return getValueAs(name, fields);
 	}
 }
 

dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/provision/update/CrossrefClient.java

@@ -61,9 +61,8 @@ public class CrossrefClient {
 				int size = decompresser.inflate(buffer);
 				bos.write(buffer, 0, size);
 			}
-			byte[] unzippeddata = bos.toByteArray();
 			decompresser.end();
-			return new String(unzippeddata);
+			return bos.toString();
 		} catch (Throwable e) {
 			throw new RuntimeException("Wrong record:" + blob, e);
 		}