diff --git a/.settings/org.eclipse.jdt.core.prefs b/.settings/org.eclipse.jdt.core.prefs
index 8ad6fb0..443e085 100644
--- a/.settings/org.eclipse.jdt.core.prefs
+++ b/.settings/org.eclipse.jdt.core.prefs
@@ -1,8 +1,8 @@
 eclipse.preferences.version=1
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
-org.eclipse.jdt.core.compiler.compliance=1.5
+org.eclipse.jdt.core.compiler.compliance=1.7
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
 org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
-org.eclipse.jdt.core.compiler.source=1.5
+org.eclipse.jdt.core.compiler.source=1.7
diff --git a/.settings/org.eclipse.wst.common.project.facet.core.xml b/.settings/org.eclipse.wst.common.project.facet.core.xml
index a50949e..4f92af5 100644
--- a/.settings/org.eclipse.wst.common.project.facet.core.xml
+++ b/.settings/org.eclipse.wst.common.project.facet.core.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <faceted-project>
   <installed facet="jst.utility" version="1.0"/>
-  <installed facet="java" version="1.5"/>
+  <installed facet="java" version="1.7"/>
 </faceted-project>
diff --git a/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java b/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java
index 85493fd..eb27bb7 100644
--- a/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java
@@ -2569,7 +2569,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 					deleteColumnSession);
 			if (invocation == null) {
 				throw new TDGWTServiceException(
-						"Error in ChangeColumnType: Operation not supported for now!");
+						"Error Delete Column: Operation not supported for now!");
 			}
 
 			TabularResourceId serviceTR = new TabularResourceId(
@@ -2578,11 +2578,11 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 			logger.debug("OperationInvocation: \n" + invocation.toString());
 			Task trTask = service.execute(invocation, serviceTR);
 			logger.debug("Start Task on service: TaskId " + trTask.getId());
-			SessionUtil.setChangeColumnTypeTask(session, trTask);
+			SessionUtil.setDeleteColumnTask(session, trTask);
 			return;
 		} catch (Exception e) {
 			e.printStackTrace();
-			throw new TDGWTServiceException("Error in ChangeColumnType: "
+			throw new TDGWTServiceException("Error in DeleteColumn: "
 					+ e.getLocalizedMessage());
 		}
 
@@ -2604,13 +2604,13 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 			if (task == null) {
 				logger.debug("Task null");
 				throw new TDGWTServiceException(
-						"Error in ChangeColumnType task null");
+						"Error in DeleteColumnMonitor task null");
 			} else {
 				TaskStatus status = task.getStatus();
 				if (status == null) {
 					logger.debug("Services TaskStatus : null");
 					throw new TDGWTServiceException(
-							"Error in ChangeColumnType Status null");
+							"Error in DeleteColumnMonitor Status null");
 				} else {
 					logger.debug("Services TaskStatus: " + task.getStatus());
 
@@ -2624,7 +2624,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 							deleteColumnMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
-							logger.debug("Task exception: Error In ChangeColumnType");
+							logger.debug("Task exception: Error In DeleteColumnMonitor");
 							deleteColumnMonitor.setError(new Throwable(
 									"Error In ChangeColumnType"));
 						}
@@ -2666,7 +2666,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						break;
 					}
 				}
-				SessionUtil.setChangeColumnTypeTask(session, task);
+				SessionUtil.setDeleteColumnTask(session, task);
 			}
 
 			logger.info("DeleteColumnMonitor(): " + deleteColumnMonitor);