diff --git a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/ColumnListParameter.java b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/ColumnListParameter.java
index 107f6d6..da3eb3d 100644
--- a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/ColumnListParameter.java
+++ b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/ColumnListParameter.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.portlets.user.dataminermanager.shared.parameters;
 
-import java.io.Serializable;
 
 /**
  * 
diff --git a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/ColumnParameter.java b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/ColumnParameter.java
index 2d42a1d..963a204 100644
--- a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/ColumnParameter.java
+++ b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/ColumnParameter.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.portlets.user.dataminermanager.shared.parameters;
 
-import java.io.Serializable;
 
 /**
  * 
diff --git a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/DateParameter.java b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/DateParameter.java
index b437957..24424c8 100644
--- a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/DateParameter.java
+++ b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/DateParameter.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.portlets.user.dataminermanager.shared.parameters;
 
-import com.google.gwt.user.client.rpc.IsSerializable;
 
 /**
  * 
diff --git a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/EnumParameter.java b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/EnumParameter.java
index 0557122..083b224 100644
--- a/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/EnumParameter.java
+++ b/src/main/java/org/gcube/portlets/user/dataminermanager/shared/parameters/EnumParameter.java
@@ -6,8 +6,6 @@ package org.gcube.portlets.user.dataminermanager.shared.parameters;
 import java.util.ArrayList;
 import java.util.List;
 
-import com.google.gwt.user.client.rpc.IsSerializable;
-
 /**
  * 
  * @author Giancarlo Panichi