diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/DumpGraphEntities.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/DumpGraphEntities.java
index 16653be9dd..38e867b97f 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/DumpGraphEntities.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/DumpGraphEntities.java
@@ -8,8 +8,6 @@ import java.io.StringReader;
 import java.util.*;
 import java.util.stream.Collectors;
 
-import eu.dnetlib.dhp.schema.dump.oaf.graph.Funder;
-import eu.dnetlib.dhp.schema.dump.oaf.graph.Project;
 import org.apache.spark.SparkConf;
 import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Encoders;
@@ -91,7 +89,9 @@ public class DumpGraphEntities implements Serializable {
 		Class<E> inputClazz) {
 		Utils
 			.readPath(spark, inputPath, inputClazz)
-			.map((MapFunction<E, Datasource>) d -> mapDatasource((eu.dnetlib.dhp.schema.oaf.Datasource) d), Encoders.bean(Datasource.class))
+			.map(
+				(MapFunction<E, Datasource>) d -> mapDatasource((eu.dnetlib.dhp.schema.oaf.Datasource) d),
+				Encoders.bean(Datasource.class))
 			.filter(Objects::nonNull)
 			.write()
 			.mode(SaveMode.Overwrite)
@@ -103,7 +103,9 @@ public class DumpGraphEntities implements Serializable {
 		Class<E> inputClazz) {
 		Utils
 			.readPath(spark, inputPath, inputClazz)
-			.map((MapFunction<E,Project>) p -> mapProject((eu.dnetlib.dhp.schema.oaf.Project) p), Encoders.bean(Project.class))
+			.map(
+				(MapFunction<E, Project>) p -> mapProject((eu.dnetlib.dhp.schema.oaf.Project) p),
+				Encoders.bean(Project.class))
 			.write()
 			.mode(SaveMode.Overwrite)
 			.option("compression", "gzip")
@@ -445,7 +447,9 @@ public class DumpGraphEntities implements Serializable {
 		Class<E> inputClazz) {
 		Utils
 			.readPath(spark, inputPath, inputClazz)
-			.map((MapFunction<E, Organization>) o -> mapOrganization((eu.dnetlib.dhp.schema.oaf.Organization) o), Encoders.bean(Organization.class))
+			.map(
+				(MapFunction<E, Organization>) o -> mapOrganization((eu.dnetlib.dhp.schema.oaf.Organization) o),
+				Encoders.bean(Organization.class))
 			.write()
 			.mode(SaveMode.Overwrite)
 			.option("compression", "gzip")
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/SparkCollectAndSave.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/SparkCollectAndSave.java
index 1ae351dbf7..a26f85bd71 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/SparkCollectAndSave.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/SparkCollectAndSave.java
@@ -49,9 +49,9 @@ public class SparkCollectAndSave implements Serializable {
 		log.info("outputPath: {}", outputPath);
 
 		final Boolean aggregateResult = Optional
-				.ofNullable(parser.get("resultAggregation"))
-				.map(Boolean::valueOf)
-				.orElse(Boolean.TRUE);
+			.ofNullable(parser.get("resultAggregation"))
+			.map(Boolean::valueOf)
+			.orElse(Boolean.TRUE);
 
 		SparkConf conf = new SparkConf();
 
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/SparkDumpRelationJob.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/SparkDumpRelationJob.java
index 59aad1f309..a348b43492 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/SparkDumpRelationJob.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/SparkDumpRelationJob.java
@@ -8,6 +8,7 @@ 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.Encoders;
 import org.apache.spark.sql.SaveMode;
 import org.apache.spark.sql.SparkSession;
@@ -67,7 +68,7 @@ public class SparkDumpRelationJob implements Serializable {
 	private static void dumpRelation(SparkSession spark, String inputPath, String outputPath) {
 		Utils
 			.readPath(spark, inputPath, Relation.class)
-			.map(relation -> {
+			.map((MapFunction<Relation, eu.dnetlib.dhp.schema.dump.oaf.graph.Relation>) relation -> {
 				eu.dnetlib.dhp.schema.dump.oaf.graph.Relation rel = new eu.dnetlib.dhp.schema.dump.oaf.graph.Relation();
 				rel
 					.setSource(