diff --git a/.classpath b/.classpath
index 4dd9594..2a6a282 100644
--- a/.classpath
+++ b/.classpath
@@ -21,6 +21,7 @@
 	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="org.eclipse.jst.component.nondependency" value=""/>
 		</attributes>
 	</classpathentry>
 	<classpathentry kind="output" path="target/tabular-data-widgetx-1.0.0-SNAPSHOT/WEB-INF/classes"/>
diff --git a/.project b/.project
index 381d37f..d853412 100644
--- a/.project
+++ b/.project
@@ -5,6 +5,11 @@
 	<projects>
 	</projects>
 	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.wst.common.project.facet.core.builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
 		<buildCommand>
 			<name>org.eclipse.jdt.core.javabuilder</name>
 			<arguments>
@@ -15,9 +20,17 @@
 			<arguments>
 			</arguments>
 		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.wst.validation.validationbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
 	</buildSpec>
 	<natures>
+		<nature>org.eclipse.jem.workbench.JavaEMFNature</nature>
+		<nature>org.eclipse.wst.common.modulecore.ModuleCoreNature</nature>
 		<nature>org.eclipse.jdt.core.javanature</nature>
 		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
 	</natures>
 </projectDescription>
diff --git a/src/main/java/org/gcube/portlets/user/tdwx/client/TabularDataXGridPanel.java b/src/main/java/org/gcube/portlets/user/tdwx/client/TabularDataXGridPanel.java
index ee49220..d22426c 100644
--- a/src/main/java/org/gcube/portlets/user/tdwx/client/TabularDataXGridPanel.java
+++ b/src/main/java/org/gcube/portlets/user/tdwx/client/TabularDataXGridPanel.java
@@ -39,7 +39,7 @@ import com.google.gwt.core.client.Scheduler;
 import com.google.gwt.core.client.Scheduler.ScheduledCommand;
 import com.google.gwt.event.logical.shared.SelectionEvent;
 import com.google.gwt.event.logical.shared.SelectionHandler;
-import com.google.gwt.event.shared.EventBus;
+import com.google.web.bindery.event.shared.EventBus;
 import com.google.gwt.http.client.RequestBuilder;
 import com.sencha.gxt.core.client.Style.SelectionMode;
 import com.sencha.gxt.data.client.loader.HttpProxy;