diff --git a/dhp-common/src/test/java/eu/dnetlib/dhp/oa/merge/AuthorMergerTest.java b/dhp-common/src/test/java/eu/dnetlib/dhp/oa/merge/AuthorMergerTest.java
index d7b3bc36f..9c4e62214 100644
--- a/dhp-common/src/test/java/eu/dnetlib/dhp/oa/merge/AuthorMergerTest.java
+++ b/dhp-common/src/test/java/eu/dnetlib/dhp/oa/merge/AuthorMergerTest.java
@@ -9,11 +9,12 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 
-import org.codehaus.jackson.map.ObjectMapper;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+
 import eu.dnetlib.dhp.schema.oaf.Author;
 import eu.dnetlib.dhp.schema.oaf.Publication;
 import eu.dnetlib.dhp.schema.oaf.StructuredProperty;
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
index 1efa86586..bff92ecf9 100644
--- a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
@@ -105,6 +105,8 @@ public class ModelConstants {
 	public static final KeyValue UNKNOWN_REPOSITORY = keyValue(
 		"10|openaire____::55045bd2a65019fd8e6741a755395c8c", "Unknown Repository");
 
+	public static final Qualifier UNKNOWN_COUNTRY = qualifier(UNKNOWN, "Unknown", DNET_COUNTRY_TYPE, DNET_COUNTRY_TYPE);
+
 	private static Qualifier qualifier(
 		final String classid,
 		final String classname,
diff --git a/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/EntityMergerTest.java b/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/EntityMergerTest.java
index 882483e22..c35bbf424 100644
--- a/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/EntityMergerTest.java
+++ b/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/EntityMergerTest.java
@@ -10,10 +10,11 @@ import java.io.Serializable;
 import java.nio.file.Paths;
 import java.util.*;
 
-import org.codehaus.jackson.map.ObjectMapper;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+
 import eu.dnetlib.dhp.oa.merge.AuthorMerger;
 import eu.dnetlib.dhp.schema.oaf.*;
 import eu.dnetlib.pace.util.MapDocumentUtil;
diff --git a/dhp-workflows/dhp-dedup-scholexplorer/src/main/java/eu/dnetlib/dedup/SparkCreateConnectedComponent.java b/dhp-workflows/dhp-dedup-scholexplorer/src/main/java/eu/dnetlib/dedup/SparkCreateConnectedComponent.java
index 8646ac742..9bc90d51d 100644
--- a/dhp-workflows/dhp-dedup-scholexplorer/src/main/java/eu/dnetlib/dedup/SparkCreateConnectedComponent.java
+++ b/dhp-workflows/dhp-dedup-scholexplorer/src/main/java/eu/dnetlib/dedup/SparkCreateConnectedComponent.java
@@ -7,7 +7,6 @@ import java.util.List;
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.api.java.JavaPairRDD;
 import org.apache.spark.api.java.JavaRDD;
-import org.apache.spark.api.java.JavaSparkContext;
 import org.apache.spark.api.java.function.FlatMapFunction;
 import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.api.java.function.PairFunction;
@@ -16,8 +15,8 @@ import org.apache.spark.rdd.RDD;
 import org.apache.spark.sql.Dataset;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.SparkSession;
-import org.codehaus.jackson.map.ObjectMapper;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.hash.Hashing;
 
 import eu.dnetlib.dedup.graph.ConnectedComponent;
diff --git a/dhp-workflows/dhp-dedup-scholexplorer/src/main/java/eu/dnetlib/dedup/SparkCreateSimRels.java b/dhp-workflows/dhp-dedup-scholexplorer/src/main/java/eu/dnetlib/dedup/SparkCreateSimRels.java
index 572824e3d..7adf992cd 100644
--- a/dhp-workflows/dhp-dedup-scholexplorer/src/main/java/eu/dnetlib/dedup/SparkCreateSimRels.java
+++ b/dhp-workflows/dhp-dedup-scholexplorer/src/main/java/eu/dnetlib/dedup/SparkCreateSimRels.java
@@ -10,7 +10,8 @@ import org.apache.spark.api.java.JavaSparkContext;
 import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.SparkSession;
-import org.codehaus.jackson.map.ObjectMapper;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
 
 import eu.dnetlib.dhp.application.ArgumentApplicationParser;
 import eu.dnetlib.dhp.schema.oaf.Oaf;
diff --git a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/DoiBoostMappingUtil.scala b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/DoiBoostMappingUtil.scala
index 8d906fa15..683986de2 100644
--- a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/DoiBoostMappingUtil.scala
+++ b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/DoiBoostMappingUtil.scala
@@ -4,14 +4,13 @@ import eu.dnetlib.dhp.schema.action.AtomicAction
 import eu.dnetlib.dhp.schema.oaf.{DataInfo, Dataset, Field, Instance, KeyValue, Oaf, Organization, Publication, Qualifier, Relation, Result, StructuredProperty}
 import eu.dnetlib.dhp.utils.DHPUtils
 import org.apache.commons.lang3.StringUtils
-import org.codehaus.jackson.map.ObjectMapper
+import com.fasterxml.jackson.databind.ObjectMapper
 import org.json4s
 import org.json4s.DefaultFormats
 import org.json4s.jackson.JsonMethods.parse
 import org.slf4j.{Logger, LoggerFactory}
 
 import scala.collection.JavaConverters._
-import scala.io.Source
 
 
 case class HostedByItemType(id: String, officialname: String, issn: String, eissn: String, lissn: String, openAccess: Boolean) {}
@@ -19,17 +18,11 @@ case class HostedByItemType(id: String, officialname: String, issn: String, eiss
 case class DoiBoostAffiliation(PaperId:Long, AffiliationId:Long, GridId:Option[String], OfficialPage:Option[String], DisplayName:Option[String]){}
 
 object DoiBoostMappingUtil {
-  def getUnknownCountry(): Qualifier = {
-    createQualifier("UNKNOWN","UNKNOWN","dnet:countries","dnet:countries")
-  }
-
-
 
   def generateMAGAffiliationId(affId: String): String = {
     s"20|microsoft___$SEPARATOR${DHPUtils.md5(affId)}"
   }
 
-
   val logger: Logger = LoggerFactory.getLogger(getClass)
 
   //STATIC STRING
diff --git a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/SparkGenerateDoiBoost.scala b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/SparkGenerateDoiBoost.scala
index 860254527..19a512ac6 100644
--- a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/SparkGenerateDoiBoost.scala
+++ b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/SparkGenerateDoiBoost.scala
@@ -2,6 +2,7 @@ package eu.dnetlib.doiboost
 
 import eu.dnetlib.dhp.application.ArgumentApplicationParser
 import eu.dnetlib.dhp.oa.merge.AuthorMerger
+import eu.dnetlib.dhp.schema.common.ModelConstants
 import eu.dnetlib.dhp.schema.oaf.{Organization, Publication, Relation, Dataset => OafDataset}
 import eu.dnetlib.doiboost.mag.ConversionUtil
 import org.apache.commons.io.IOUtils
@@ -132,7 +133,7 @@ object SparkGenerateDoiBoost {
           o.setLegalname(DoiBoostMappingUtil.asField(affiliation.DisplayName.get))
         if (affiliation.OfficialPage.isDefined)
           o.setWebsiteurl(DoiBoostMappingUtil.asField(affiliation.OfficialPage.get))
-        o.setCountry(DoiBoostMappingUtil.getUnknownCountry())
+        o.setCountry(ModelConstants.UNKNOWN_COUNTRY)
         o
       }
       else
diff --git a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/ORCIDToOAF.scala b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/ORCIDToOAF.scala
index f7255e559..e9773dbbb 100644
--- a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/ORCIDToOAF.scala
+++ b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/ORCIDToOAF.scala
@@ -1,11 +1,11 @@
 package eu.dnetlib.doiboost.orcid
 
+import com.fasterxml.jackson.databind.ObjectMapper
 import eu.dnetlib.dhp.schema.oaf.{Author, DataInfo, Publication}
 import eu.dnetlib.dhp.schema.orcid.OrcidDOI
 import eu.dnetlib.doiboost.DoiBoostMappingUtil
 import eu.dnetlib.doiboost.DoiBoostMappingUtil.{ORCID, PID_TYPES, createSP, generateDataInfo, generateIdentifier}
 import org.apache.commons.lang.StringUtils
-import org.codehaus.jackson.map.ObjectMapper
 import org.slf4j.{Logger, LoggerFactory}
 
 import scala.collection.JavaConverters._
@@ -18,7 +18,7 @@ case class ORCIDItem(oid:String,name:String,surname:String,creditName:String,err
 case class ORCIDElement(doi:String, authors:List[ORCIDItem]) {}
 object ORCIDToOAF {
   val logger: Logger = LoggerFactory.getLogger(ORCIDToOAF.getClass)
-  val mapper = new ObjectMapper
+  val mapper = new ObjectMapper()
 
   def isJsonValid(inputStr: String): Boolean = {
     import java.io.IOException
diff --git a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkDownloadOrcidAuthors.java b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkDownloadOrcidAuthors.java
index 598835a00..1422a0840 100644
--- a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkDownloadOrcidAuthors.java
+++ b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/orcid/SparkDownloadOrcidAuthors.java
@@ -3,10 +3,8 @@ package eu.dnetlib.doiboost.orcid;
 
 import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkSession;
 
-import java.io.IOException;
 import java.text.SimpleDateFormat;
 import java.util.Date;
-import java.util.List;
 import java.util.Optional;
 
 import org.apache.commons.io.IOUtils;
@@ -18,11 +16,9 @@ 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.JavaPairRDD;
-import org.apache.spark.api.java.JavaRDD;
 import org.apache.spark.api.java.JavaSparkContext;
 import org.apache.spark.api.java.function.Function;
 import org.apache.spark.util.LongAccumulator;
-import org.mortbay.log.Log;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -36,7 +32,7 @@ public class SparkDownloadOrcidAuthors {
 	static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
 	static final String lastUpdate = "2020-09-29 00:00:00";
 
-	public static void main(String[] args) throws IOException, Exception {
+	public static void main(String[] args) throws Exception {
 
 		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
 			IOUtils
@@ -51,12 +47,12 @@ public class SparkDownloadOrcidAuthors {
 			.orElse(Boolean.TRUE);
 		logger.info("isSparkSessionManaged: {}", isSparkSessionManaged);
 		final String workingPath = parser.get("workingPath");
-		logger.info("workingPath: ", workingPath);
+		logger.info("workingPath: {}", workingPath);
 		final String outputPath = parser.get("outputPath");
-		logger.info("outputPath: ", outputPath);
+		logger.info("outputPath: {}", outputPath);
 		final String token = parser.get("token");
 		final String lambdaFileName = parser.get("lambdaFileName");
-		logger.info("lambdaFileName: ", lambdaFileName);
+		logger.info("lambdaFileName: {}", lambdaFileName);
 
 		SparkConf conf = new SparkConf();
 		runWithSparkSession(
@@ -171,8 +167,8 @@ public class SparkDownloadOrcidAuthors {
 	}
 
 	private static boolean isModified(String orcidId, String modifiedDate) {
-		Date modifiedDateDt = null;
-		Date lastUpdateDt = null;
+		Date modifiedDateDt;
+		Date lastUpdateDt;
 		try {
 			if (modifiedDate.length() != 19) {
 				modifiedDate = modifiedDate.substring(0, 19);
diff --git a/dhp-workflows/dhp-doiboost/src/test/java/eu/dnetlib/doiboost/orcid/MappingORCIDToOAFTest.scala b/dhp-workflows/dhp-doiboost/src/test/java/eu/dnetlib/doiboost/orcid/MappingORCIDToOAFTest.scala
index 0222b393d..a1b3d06b7 100644
--- a/dhp-workflows/dhp-doiboost/src/test/java/eu/dnetlib/doiboost/orcid/MappingORCIDToOAFTest.scala
+++ b/dhp-workflows/dhp-doiboost/src/test/java/eu/dnetlib/doiboost/orcid/MappingORCIDToOAFTest.scala
@@ -1,9 +1,9 @@
 package eu.dnetlib.doiboost.orcid
 
+import com.fasterxml.jackson.databind.ObjectMapper
 import eu.dnetlib.dhp.schema.oaf.Publication
 import eu.dnetlib.doiboost.orcid.SparkConvertORCIDToOAF.getClass
 import org.apache.spark.sql.{Encoder, Encoders, SparkSession}
-import org.codehaus.jackson.map.ObjectMapper
 import org.junit.jupiter.api.Assertions._
 import org.junit.jupiter.api.Test
 import org.slf4j.{Logger, LoggerFactory}
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/clean/CleaningFunctions.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/clean/CleaningFunctions.java
index 859fc074c..885d761c5 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/clean/CleaningFunctions.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/clean/CleaningFunctions.java
@@ -89,7 +89,7 @@ public class CleaningFunctions {
 		} else if (value instanceof Organization) {
 			Organization o = (Organization) value;
 			if (Objects.isNull(o.getCountry()) || StringUtils.isBlank(o.getCountry().getClassid())) {
-				o.setCountry(qualifier(ModelConstants.UNKNOWN, "Unknown", ModelConstants.DNET_COUNTRY_TYPE));
+				o.setCountry(ModelConstants.UNKNOWN_COUNTRY);
 			}
 		} else if (value instanceof Relation) {
 			// nothing to clean here
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/common/AbstractMigrationApplication.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/common/AbstractMigrationApplication.java
index f7579c0a0..a0ce4f5a6 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/common/AbstractMigrationApplication.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/common/AbstractMigrationApplication.java
@@ -11,7 +11,8 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.io.SequenceFile;
 import org.apache.hadoop.io.Text;
-import org.codehaus.jackson.map.ObjectMapper;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
 
 import eu.dnetlib.dhp.schema.oaf.Oaf;
 
diff --git a/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/export/DLIToOAF.scala b/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/export/DLIToOAF.scala
index 705160a2b..8043236e0 100644
--- a/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/export/DLIToOAF.scala
+++ b/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/export/DLIToOAF.scala
@@ -1,15 +1,15 @@
 package eu.dnetlib.dhp.export
 
+import com.fasterxml.jackson.databind.ObjectMapper
+
 import java.time.LocalDateTime
 import java.time.format.DateTimeFormatter
-
 import eu.dnetlib.dhp.common.PacePerson
 import eu.dnetlib.dhp.schema.action.AtomicAction
-import eu.dnetlib.dhp.schema.oaf.{Author,  Dataset, ExternalReference, Field, Instance, KeyValue, Oaf, Publication, Qualifier, Relation, Result, StructuredProperty}
+import eu.dnetlib.dhp.schema.oaf.{Author, Dataset, ExternalReference, Field, Instance, KeyValue, Oaf, Publication, Qualifier, Relation, Result, StructuredProperty}
 import eu.dnetlib.dhp.schema.scholexplorer.{DLIDataset, DLIPublication}
 import eu.dnetlib.dhp.utils.DHPUtils
 import org.apache.commons.lang3.StringUtils
-import org.codehaus.jackson.map.ObjectMapper
 import eu.dnetlib.dhp.schema.scholexplorer.OafUtils._
 
 import scala.collection.JavaConverters._
diff --git a/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/export/SparkExportContentForOpenAire.scala b/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/export/SparkExportContentForOpenAire.scala
index f1e374f95..3f632af22 100644
--- a/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/export/SparkExportContentForOpenAire.scala
+++ b/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/export/SparkExportContentForOpenAire.scala
@@ -1,27 +1,21 @@
 package eu.dnetlib.dhp.`export`
 
 import eu.dnetlib.dhp.application.ArgumentApplicationParser
-import eu.dnetlib.dhp.schema.oaf.{Instance, Publication, Relation, Dataset => OafDataset}
+import eu.dnetlib.dhp.schema.oaf.{Publication, Relation, Dataset => OafDataset}
 import eu.dnetlib.dhp.schema.scholexplorer.{DLIDataset, DLIPublication}
 import org.apache.commons.io.IOUtils
 import org.apache.hadoop.io.Text
 import org.apache.hadoop.io.compress.GzipCodec
 import org.apache.hadoop.mapred.SequenceFileOutputFormat
-import org.apache.spark.rdd.RDD
 import org.apache.spark.sql.{Dataset, Encoder, Encoders, SaveMode, SparkSession}
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.expressions.Window
-import org.apache.spark.{SparkConf, SparkContext}
-import org.codehaus.jackson.map.ObjectMapper
+import org.apache.spark.SparkConf
 
 import scala.collection.mutable.ArrayBuffer
-import scala.collection.JavaConverters._
 
 object SparkExportContentForOpenAire {
 
-
-
-
   def main(args: Array[String]): Unit = {
     val conf: SparkConf = new SparkConf()
     val parser = new ArgumentApplicationParser(IOUtils.toString(SparkExportContentForOpenAire.getClass.getResourceAsStream("input_export_content_parameters.json")))
@@ -178,11 +172,4 @@ object SparkExportContentForOpenAire {
     fRels.union(fpubs).union(fdats).rdd.map(s => (new Text(s._1), new Text(s._2))).saveAsHadoopFile(s"$workingPath/export/rawset", classOf[Text], classOf[Text], classOf[SequenceFileOutputFormat[Text,Text]], classOf[GzipCodec])
   }
 
-
-
-
-
-
-
-
 }
diff --git a/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/provision/DropAndCreateESIndex.java b/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/provision/DropAndCreateESIndex.java
index 1b5849f35..7598fd957 100644
--- a/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/provision/DropAndCreateESIndex.java
+++ b/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/provision/DropAndCreateESIndex.java
@@ -10,7 +10,8 @@ import org.apache.http.client.methods.HttpPut;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;
-import org.codehaus.jackson.map.ObjectMapper;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
 
 import eu.dnetlib.dhp.application.ArgumentApplicationParser;
 
diff --git a/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/provision/SparkConvertDatasetToJson.scala b/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/provision/SparkConvertDatasetToJson.scala
index 81bdb2941..8133666a6 100644
--- a/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/provision/SparkConvertDatasetToJson.scala
+++ b/dhp-workflows/dhp-graph-provision-scholexplorer/src/main/java/eu/dnetlib/dhp/provision/SparkConvertDatasetToJson.scala
@@ -1,5 +1,6 @@
 package eu.dnetlib.dhp.provision
 
+import com.fasterxml.jackson.databind.ObjectMapper
 import eu.dnetlib.dhp.application.ArgumentApplicationParser
 import eu.dnetlib.dhp.provision.scholix.Scholix
 import eu.dnetlib.dhp.provision.scholix.summary.ScholixSummary
@@ -7,7 +8,6 @@ import org.apache.commons.io.IOUtils
 import org.apache.hadoop.io.compress.GzipCodec
 import org.apache.spark.SparkConf
 import org.apache.spark.sql.{Encoder, Encoders, SparkSession}
-import org.codehaus.jackson.map.ObjectMapper
 
 object SparkConvertDatasetToJson {