diff --git a/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/collection/CollectionUtils.scala b/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/collection/CollectionUtils.scala
index 509e464e5..e7de60e07 100644
--- a/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/collection/CollectionUtils.scala
+++ b/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/collection/CollectionUtils.scala
@@ -48,18 +48,16 @@ object CollectionUtils {
     List()
   }
 
-  def saveDataset(d: Dataset[Oaf], targetPath: String):Unit = {
+  def saveDataset(dataset: Dataset[Oaf], targetPath: String): Unit = {
     implicit val resultEncoder: Encoder[Oaf] = Encoders.kryo(classOf[Oaf])
-    val mapper = new ObjectMapper
 
-    d
+    dataset
       .flatMap(i => CollectionUtils.fixRelations(i))
       .filter(i => i != null)
-      .map(r => mapper.writeValueAsString(r))(Encoders.STRING)
       .write
       .mode(SaveMode.Overwrite)
       .option("compression", "gzip")
-      .text(targetPath)
+      .json(targetPath)
   }
 
 }
diff --git a/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/datacite/GenerateDataciteDatasetSpark.scala b/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/datacite/GenerateDataciteDatasetSpark.scala
index d11c33fb4..a205edcf2 100644
--- a/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/datacite/GenerateDataciteDatasetSpark.scala
+++ b/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/datacite/GenerateDataciteDatasetSpark.scala
@@ -38,7 +38,7 @@ class GenerateDataciteDatasetSpark (propertyPath:String, args:Array[String], log
     val cleanedMdStoreVersion = mapper.readValue(mdstoreOutputVersion, classOf[MDStoreVersion])
     val outputBasePath = cleanedMdStoreVersion.getHdfsPath
     log.info(s"outputBasePath is '$outputBasePath'")
-    val targetPath = s"$outputBasePath/$MDSTORE_DATA_PATH"
+    val targetPath = s"$outputBasePath$MDSTORE_DATA_PATH"
     log.info(s"targetPath is '$targetPath'")
 
     generateDataciteDataset(sourcePath, exportLinks, vocabularies, targetPath, spark)
@@ -54,7 +54,7 @@ class GenerateDataciteDatasetSpark (propertyPath:String, args:Array[String], log
    * @param outputBasePath
    */
   def reportTotalSize( targetPath: String, outputBasePath: String ):Unit = {
-    val total_items = spark.read.load(targetPath).count()
+    val total_items = spark.read.text(targetPath).count()
     writeHdfsFile(spark.sparkContext.hadoopConfiguration, s"$total_items", outputBasePath + MDSTORE_SIZE_PATH)
   }