diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/ProtoConverter.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/util/ProtoConverter.java
similarity index 99%
rename from dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/ProtoConverter.java
rename to dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/util/ProtoConverter.java
index 6cf64923e..69b201248 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/ProtoConverter.java
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/util/ProtoConverter.java
@@ -1,4 +1,4 @@
-package eu.dnetlib.dhp.graph;
+package eu.dnetlib.dhp.schema.util;
 
 import eu.dnetlib.data.proto.*;
 import eu.dnetlib.dhp.schema.oaf.*;
@@ -6,7 +6,7 @@ import eu.dnetlib.dhp.schema.oaf.*;
 import java.io.Serializable;
 import java.util.stream.Collectors;
 
-import static eu.dnetlib.dhp.graph.ProtoUtils.*;
+import static eu.dnetlib.dhp.schema.util.ProtoUtils.*;
 
 public class ProtoConverter implements Serializable {
 
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/ProtoUtils.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/util/ProtoUtils.java
similarity index 99%
rename from dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/ProtoUtils.java
rename to dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/util/ProtoUtils.java
index 41e0baa57..6834e217c 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/ProtoUtils.java
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/util/ProtoUtils.java
@@ -1,4 +1,4 @@
-package eu.dnetlib.dhp.graph;
+package eu.dnetlib.dhp.schema.util;
 
 import com.googlecode.protobuf.format.JsonFormat;
 import eu.dnetlib.data.proto.FieldTypeProtos;
diff --git a/dhp-workflows/dhp-graph-mapper/pom.xml b/dhp-workflows/dhp-graph-mapper/pom.xml
index 4a4492cee..b70058f8f 100644
--- a/dhp-workflows/dhp-graph-mapper/pom.xml
+++ b/dhp-workflows/dhp-graph-mapper/pom.xml
@@ -44,6 +44,11 @@
             <version>1.0.0-SNAPSHOT</version>
         </dependency>
 
+        <dependency>
+            <groupId>de.javakaffee</groupId>
+            <artifactId>kryo-serializers</artifactId>
+        </dependency>
+
     </dependencies>
 
 
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/SparkGraphImporterJob.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/SparkGraphImporterJob.java
index 625b34223..573495795 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/SparkGraphImporterJob.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/graph/SparkGraphImporterJob.java
@@ -2,6 +2,7 @@ package eu.dnetlib.dhp.graph;
 
 import eu.dnetlib.dhp.application.ArgumentApplicationParser;
 import eu.dnetlib.dhp.schema.oaf.*;
+import eu.dnetlib.dhp.schema.util.ProtoConverter;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang.StringUtils;
 import org.apache.hadoop.io.Text;
@@ -49,22 +50,22 @@ public class SparkGraphImporterJob {
 
         final Encoder<Relation> relationEncoder = Encoders.bean(Relation.class);
 
-        if (filter == null|| filter.toLowerCase().contains("organization"))
+        if (StringUtils.isBlank(filter)|| filter.toLowerCase().contains("organization"))
             spark.createDataset(oafRdd.filter(s -> s instanceof Organization).map(s -> (Organization) s).rdd(), organizationEncoder).write().save(outputPath + "/organizations");
-        if (filter == null|| filter.toLowerCase().contains("project"))
+        if (StringUtils.isBlank(filter)|| filter.toLowerCase().contains("project"))
         spark.createDataset(oafRdd.filter(s -> s instanceof Project).map(s -> (Project) s).rdd(), projectEncoder).write().save(outputPath + "/projects");
-        if (filter == null|| filter.toLowerCase().contains("datasource"))
+        if (StringUtils.isBlank(filter)|| filter.toLowerCase().contains("datasource"))
             spark.createDataset(oafRdd.filter(s -> s instanceof Datasource).map(s -> (Datasource) s).rdd(), datasourceEncoder).write().save(outputPath + "/datasources");
-        if (filter == null|| filter.toLowerCase().contains("dataset"))
+        if (StringUtils.isBlank(filter)|| filter.toLowerCase().contains("dataset"))
             spark.createDataset(oafRdd.filter(s -> s instanceof eu.dnetlib.dhp.schema.oaf.Dataset).map(s -> (eu.dnetlib.dhp.schema.oaf.Dataset) s).rdd(), datasetEncoder).write().save(outputPath + "/datasets");
 
-        if (filter == null|| filter.toLowerCase().contains("publication"))
+        if (StringUtils.isBlank(filter)|| filter.toLowerCase().contains("publication"))
             spark.createDataset(oafRdd.filter(s -> s instanceof Publication).map(s -> (Publication) s).rdd(), publicationEncoder).write().save(outputPath + "/publications");
-        if (filter == null|| filter.toLowerCase().contains("software"))
+        if (StringUtils.isBlank(filter)|| filter.toLowerCase().contains("software"))
             spark.createDataset(oafRdd.filter(s -> s instanceof Software).map(s -> (Software) s).rdd(), softwareEncoder).write().save(outputPath + "/software");
-        if (filter == null|| filter.toLowerCase().contains("otherresearchproduct"))
+        if (StringUtils.isBlank(filter)|| filter.toLowerCase().contains("otherresearchproduct"))
             spark.createDataset(oafRdd.filter(s -> s instanceof OtherResearchProducts).map(s -> (OtherResearchProducts) s).rdd(), otherResearchProductsEncoder).write().save(outputPath + "/otherResearchProducts");
-        if (filter == null|| filter.toLowerCase().contains("relation"))
+        if (StringUtils.isBlank(filter)|| filter.toLowerCase().contains("relation"))
             spark.createDataset(oafRdd.filter(s -> s instanceof Relation).map(s -> (Relation) s).rdd(), relationEncoder).write().save(outputPath + "/relations");
     }
 }
diff --git a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/ProtoConverterTest.java b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/ProtoConverterTest.java
index 8afd0cda6..b8a062f91 100644
--- a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/ProtoConverterTest.java
+++ b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/ProtoConverterTest.java
@@ -2,6 +2,7 @@ package eu.dnetlib.dhp.graph;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import eu.dnetlib.dhp.schema.oaf.*;
+import eu.dnetlib.dhp.schema.util.ProtoConverter;
 import org.apache.commons.io.IOUtils;
 import org.junit.Test;
 
diff --git a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/SparkGraphImporterJobTest.java b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/SparkGraphImporterJobTest.java
index ce5185b61..dd5468de4 100644
--- a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/SparkGraphImporterJobTest.java
+++ b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/SparkGraphImporterJobTest.java
@@ -8,7 +8,8 @@ public class SparkGraphImporterJobTest {
     @Test
     @Ignore
     public void  testImport() throws Exception {
-        SparkGraphImporterJob.main(new String[]{"-mt", "local[*]","-i", "/home/sandro/part-m-02236", "-o", "/tmp/dataframes", "-f", "software,relation"});
+        SparkGraphImporterJob.main(new String[]{"-mt", "local[*]","-i", "/home/sandro/part-m-02236", "-o", "/tmp/dataframes", "-f", "publication"});
+
     }
 
 }
diff --git a/pom.xml b/pom.xml
index 31a408923..1727e1c1c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -47,7 +47,6 @@
     </pluginRepositories>
 
     <repositories>
-
         <repository>
             <id>dnet45-releases</id>
             <name>D-Net 45 releases</name>
@@ -60,22 +59,6 @@
                 <enabled>true</enabled>
             </releases>
         </repository>
-
-        <!--
-        <repository>
-            <id>dnet45-bootstrap-release</id>
-            <name>dnet45 bootstrap release</name>
-            <url>http://maven.research-infrastructures.eu/nexus/content/repositories/dnet45-bootstrap-release</url>
-            <layout>default</layout>
-            <snapshots>
-                <enabled>false</enabled>
-            </snapshots>
-            <releases>
-                <enabled>true</enabled>
-            </releases>
-        </repository>
-        -->
-
         <repository>
             <id>cloudera</id>
             <name>Cloudera Repository</name>
@@ -183,6 +166,12 @@
                 <version>1.1.6</version>
             </dependency>
 
+            <dependency>
+                <groupId>de.javakaffee</groupId>
+                <artifactId>kryo-serializers</artifactId>
+                <version>0.45</version>
+            </dependency>
+
             <dependency>
                 <groupId>net.schmizz</groupId>
                 <artifactId>sshj</artifactId>
@@ -252,7 +241,7 @@
             <dependency>
                 <groupId>eu.dnetlib</groupId>
                 <artifactId>dnet-openaire-data-protos</artifactId>
-                <version>3.9.5-proto250</version>
+                <version>3.9.5</version>
             </dependency>
 
         </dependencies>
@@ -326,30 +315,6 @@
                         <redirectTestOutputToFile>true</redirectTestOutputToFile>
                     </configuration>
                 </plugin>
-
-                <!--
-                <plugin>
-                    <groupId>org.apache.maven.plugins</groupId>
-                    <artifactId>maven-failsafe-plugin</artifactId>
-                    <version>2.19.1</version>
-                    <executions>
-                        <execution>
-                            <id>default-integration-test</id>
-                            <goals>
-                                <goal>integration-test</goal>
-                                <goal>verify</goal>
-                            </goals>
-                            <configuration>
-                                <groups>eu.dnetlib.dhp.common.IntegrationTest</groups>
-                                <includes>
-                                    <include>**/*Test.java</include>
-                                </includes>
-                            </configuration>
-                        </execution>
-                    </executions>
-                </plugin>
-                -->
-
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-javadoc-plugin</artifactId>
@@ -369,10 +334,8 @@
                     <artifactId>build-helper-maven-plugin</artifactId>
                     <version>1.12</version>
                 </plugin>
-
             </plugins>
         </pluginManagement>
-
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -415,10 +378,7 @@
                 <version>2.10</version>
             </extension>
         </extensions>
-
     </build>
-
-
     <distributionManagement>
         <snapshotRepository>
             <id>dnet45-snapshots</id>
@@ -431,7 +391,6 @@
             <url>http://maven.research-infrastructures.eu/nexus/content/repositories/dnet45-releases</url>
         </repository>
     </distributionManagement>
-
     <reporting>
         <plugins>
             <plugin>
@@ -456,7 +415,7 @@
         <dhp.jackson.version>2.9.6</dhp.jackson.version>
         <dhp.commons.lang.version>3.5</dhp.commons.lang.version>
         <scala.version>2.11.8</scala.version>
-        <google.protobuf.version>2.5.0</google.protobuf.version>
+        <google.protobuf.version>2.4.1</google.protobuf.version>
     </properties>
 </project>