diff --git a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/FileResource.java b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/FileResource.java
index d9ff28d..d6c536f 100644
--- a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/FileResource.java
+++ b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/FileResource.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.portlets.user.dataminermanager.shared.data.output;
 
-import java.io.Serializable;
 
 /**
  * 
@@ -11,7 +10,7 @@ import java.io.Serializable;
  * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
  *
  */
-public class FileResource extends Resource implements Serializable {
+public class FileResource extends Resource {
 
 	/**
 	 * 
diff --git a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/ImageResource.java b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/ImageResource.java
index c17c228..306007f 100644
--- a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/ImageResource.java
+++ b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/ImageResource.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.portlets.user.dataminermanager.shared.data.output;
 
-import java.io.Serializable;
 
 /**
  * 
@@ -11,7 +10,7 @@ import java.io.Serializable;
  * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
  *
  */
-public class ImageResource extends Resource implements Serializable {
+public class ImageResource extends Resource {
 
 	/**
 	 * 
diff --git a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/MapResource.java b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/MapResource.java
index 67f9d3f..7b68f75 100644
--- a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/MapResource.java
+++ b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/MapResource.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.portlets.user.dataminermanager.shared.data.output;
 
-import java.io.Serializable;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
@@ -13,7 +12,7 @@ import java.util.Map;
  * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
  *
  */
-public class MapResource extends Resource implements Serializable {
+public class MapResource extends Resource {
 
 	/**
 	 * 
diff --git a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/ObjectResource.java b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/ObjectResource.java
index 2273cc1..b1df833 100644
--- a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/ObjectResource.java
+++ b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/data/output/ObjectResource.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.portlets.user.dataminermanager.shared.data.output;
 
-import java.io.Serializable;
 
 /**
  * 
@@ -11,7 +10,7 @@ import java.io.Serializable;
  * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
  *
  */
-public class ObjectResource extends Resource implements Serializable {
+public class ObjectResource extends Resource {
 
 	/**
 	 *