diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/sx/graph/SparkConvertObjectToJson.scala b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/sx/graph/SparkConvertObjectToJson.scala
new file mode 100644
index 000000000..846ac37af
--- /dev/null
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/sx/graph/SparkConvertObjectToJson.scala
@@ -0,0 +1,53 @@
+package eu.dnetlib.dhp.sx.graph
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import eu.dnetlib.dhp.application.ArgumentApplicationParser
+import eu.dnetlib.dhp.schema.sx.scholix.Scholix
+import eu.dnetlib.dhp.schema.sx.summary.ScholixSummary
+import org.apache.commons.io.IOUtils
+import org.apache.spark.SparkConf
+import org.apache.spark.sql.{Dataset, Encoder, Encoders, SparkSession}
+import org.slf4j.{Logger, LoggerFactory}
+import org.apache.hadoop.io.compress._
+
+object SparkConvertObjectToJson {
+
+  def main(args: Array[String]): Unit = {
+    val log: Logger = LoggerFactory.getLogger(getClass)
+    val conf: SparkConf = new SparkConf()
+    val parser = new ArgumentApplicationParser(IOUtils.toString(getClass.getResourceAsStream("/eu/dnetlib/dhp/sx/graph/convert_object_json_params.json")))
+    parser.parseArgument(args)
+    val spark: SparkSession =
+      SparkSession
+        .builder()
+        .config(conf)
+        .appName(getClass.getSimpleName)
+        .master(parser.get("master")).getOrCreate()
+
+    val sourcePath = parser.get("sourcePath")
+    log.info(s"sourcePath  -> $sourcePath")
+    val targetPath = parser.get("targetPath")
+    log.info(s"targetPath  -> $targetPath")
+    val objectType = parser.get("objectType")
+    log.info(s"objectType  -> $objectType")
+
+
+    implicit val scholixEncoder :Encoder[Scholix]= Encoders.kryo[Scholix]
+    implicit val summaryEncoder :Encoder[ScholixSummary]= Encoders.kryo[ScholixSummary]
+
+
+    val mapper = new ObjectMapper
+
+    objectType.toLowerCase match {
+      case "scholix" =>
+        log.info("Serialize Scholix")
+        val d: Dataset[Scholix] = spark.read.load(sourcePath).as[Scholix]
+        d.map(s => mapper.writeValueAsString(s))(Encoders.STRING).rdd.repartition(6000).saveAsTextFile(targetPath,  classOf[GzipCodec])
+      case "summary" =>
+        log.info("Serialize Summary")
+        val d: Dataset[ScholixSummary] = spark.read.load(sourcePath).as[ScholixSummary]
+        d.map(s => mapper.writeValueAsString(s))(Encoders.STRING).rdd.repartition(1000).saveAsTextFile(targetPath,  classOf[GzipCodec])
+    }
+  }
+
+}
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/resources/eu/dnetlib/dhp/sx/graph/convert_object_json_params.json b/dhp-workflows/dhp-graph-mapper/src/main/resources/eu/dnetlib/dhp/sx/graph/convert_object_json_params.json
new file mode 100644
index 000000000..4b15da623
--- /dev/null
+++ b/dhp-workflows/dhp-graph-mapper/src/main/resources/eu/dnetlib/dhp/sx/graph/convert_object_json_params.json
@@ -0,0 +1,6 @@
+[
+  {"paramName":"mt",  "paramLongName":"master",     "paramDescription": "should be local or yarn",  "paramRequired": true},
+  {"paramName":"s",   "paramLongName":"sourcePath", "paramDescription": "the source Path",           "paramRequired": true},
+  {"paramName":"t",   "paramLongName":"targetPath", "paramDescription": "the path of the raw graph", "paramRequired": true},
+  {"paramName":"o",   "paramLongName":"objectType", "paramDescription": "should be scholix or Summary", "paramRequired": true}
+]
\ No newline at end of file
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/resources/eu/dnetlib/dhp/sx/graph/step1/oozie_app/workflow.xml b/dhp-workflows/dhp-graph-mapper/src/main/resources/eu/dnetlib/dhp/sx/graph/step1/oozie_app/workflow.xml
index 1895ab741..3ea4e9d30 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/resources/eu/dnetlib/dhp/sx/graph/step1/oozie_app/workflow.xml
+++ b/dhp-workflows/dhp-graph-mapper/src/main/resources/eu/dnetlib/dhp/sx/graph/step1/oozie_app/workflow.xml
@@ -117,6 +117,68 @@
             <arg>--relationPath</arg><arg>${targetPath}/resolved/resolvedRelation</arg>
 
         </spark>
+        <ok to="DropJSONPath"/>
+        <error to="Kill"/>
+    </action>
+
+    <action name="DropJSONPath">
+        <fs>
+            <delete path='${targetPath}/index'/>
+            <mkdir path='${targetPath}/index/'/>
+        </fs>
+        <ok to="SerializeScholix"/>
+        <error to="Kill"/>
+    </action>
+
+    <action name="SerializeScholix">
+        <spark xmlns="uri:oozie:spark-action:0.2">
+            <master>yarn</master>
+            <mode>cluster</mode>
+            <name>Serialize scholix to JSON</name>
+            <class>eu.dnetlib.dhp.sx.graph.SparkConvertObjectToJson</class>
+            <jar>dhp-graph-mapper-${projectVersion}.jar</jar>
+            <spark-opts>
+                --executor-memory=${sparkExecutorMemory}
+                --executor-cores=${sparkExecutorCores}
+                --driver-memory=${sparkDriverMemory}
+                --conf spark.extraListeners=${spark2ExtraListeners}
+                --conf spark.sql.shuffle.partitions=6000
+                --conf spark.sql.queryExecutionListeners=${spark2SqlQueryExecutionListeners}
+                --conf spark.yarn.historyServer.address=${spark2YarnHistoryServerAddress}
+                --conf spark.eventLog.dir=${nameNode}${spark2EventLogDir}
+            </spark-opts>
+            <arg>--master</arg><arg>yarn</arg>
+            <arg>--sourcePath</arg><arg>${targetPath}/provision/scholix/scholix</arg>
+            <arg>--targetPath</arg><arg>${targetPath}/index/scholix_json</arg>
+            <arg>--objectType</arg><arg>scholix</arg>
+
+        </spark>
+        <ok to="SerializeSummary"/>
+        <error to="Kill"/>
+    </action>
+
+    <action name="SerializeSummary">
+        <spark xmlns="uri:oozie:spark-action:0.2">
+            <master>yarn</master>
+            <mode>cluster</mode>
+            <name>Serialize summary to JSON</name>
+            <class>eu.dnetlib.dhp.sx.graph.SparkConvertObjectToJson</class>
+            <jar>dhp-graph-mapper-${projectVersion}.jar</jar>
+            <spark-opts>
+                --executor-memory=${sparkExecutorMemory}
+                --executor-cores=${sparkExecutorCores}
+                --driver-memory=${sparkDriverMemory}
+                --conf spark.extraListeners=${spark2ExtraListeners}
+                --conf spark.sql.shuffle.partitions=6000
+                --conf spark.sql.queryExecutionListeners=${spark2SqlQueryExecutionListeners}
+                --conf spark.yarn.historyServer.address=${spark2YarnHistoryServerAddress}
+                --conf spark.eventLog.dir=${nameNode}${spark2EventLogDir}
+            </spark-opts>
+            <arg>--master</arg><arg>yarn</arg>
+            <arg>--sourcePath</arg><arg>${targetPath}/provision/summaries_filtered</arg>
+            <arg>--targetPath</arg><arg>${targetPath}/index/summaries_json</arg>
+            <arg>--objectType</arg><arg>summary</arg>
+        </spark>
         <ok to="End"/>
         <error to="Kill"/>
     </action>