diff --git a/src/main/java/org/gcube/portlets/user/td/expressionwidget/server/ExpressionServiceImpl.java b/src/main/java/org/gcube/portlets/user/td/expressionwidget/server/ExpressionServiceImpl.java
index c86601f..84adfcf 100644
--- a/src/main/java/org/gcube/portlets/user/td/expressionwidget/server/ExpressionServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/td/expressionwidget/server/ExpressionServiceImpl.java
@@ -1,31 +1,23 @@
 package org.gcube.portlets.user.td.expressionwidget.server;
 
 import java.text.SimpleDateFormat;
-import java.util.HashMap;
-import java.util.Map;
 
 import javax.servlet.http.HttpSession;
 
 import org.gcube.application.framework.core.session.ASLSession;
 import org.gcube.data.analysis.tabulardata.commons.utils.AuthorizationProvider;
 import org.gcube.data.analysis.tabulardata.commons.utils.AuthorizationToken;
-import org.gcube.data.analysis.tabulardata.commons.webservice.types.operations.OperationDefinition;
-import org.gcube.data.analysis.tabulardata.commons.webservice.types.operations.OperationExecution;
 import org.gcube.data.analysis.tabulardata.expression.Expression;
 import org.gcube.data.analysis.tabulardata.model.metadata.table.DatasetViewTableMetadata;
 import org.gcube.data.analysis.tabulardata.model.table.Table;
 import org.gcube.data.analysis.tabulardata.service.TabularDataService;
 import org.gcube.data.analysis.tabulardata.service.impl.TabularDataServiceFactory;
-import org.gcube.data.analysis.tabulardata.service.operation.Task;
 import org.gcube.data.analysis.tabulardata.service.tabular.TabularResource;
 import org.gcube.data.analysis.tabulardata.service.tabular.TabularResourceId;
 import org.gcube.portlets.user.td.expressionwidget.client.rpc.ExpressionService;
 import org.gcube.portlets.user.td.expressionwidget.shared.exception.ExpressionServiceException;
 import org.gcube.portlets.user.td.gwtservice.server.SessionUtil;
 import org.gcube.portlets.user.td.gwtservice.server.TDGWTServiceImpl;
-import org.gcube.portlets.user.td.gwtservice.server.trservice.OperationDefinitionMap;
-import org.gcube.portlets.user.td.gwtservice.shared.Constants;
-import org.gcube.portlets.user.td.gwtservice.shared.OperationsId;
 import org.gcube.portlets.user.td.gwtservice.shared.exception.TDGWTServiceException;
 import org.gcube.portlets.user.td.gwtservice.shared.exception.TDGWTSessionExpiredException;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.FilterColumnSession;