When i try to exchange user roles from the portal, i get this error, and user 
role isn't changed:


  | 17:54:58,507 ERROR [org.hibernate.util.JDBCExceptionReporter] The 
executeUpdate method must not return a result set.
  | 17:54:58,507 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] 
Could not synchronize database state with session
  | org.hibernate.exception.SQLGrammarException: could not delete collection: 
[org.jboss.portal.core.impl.user.UserImpl.roles#4]
  |     at 
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:65)
  |     at 
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
  |     at 
org.hibernate.persister.collection.AbstractCollectionPersister.remove(AbstractCollectionPersister.java:980)
  |     at 
org.hibernate.action.CollectionRemoveAction.execute(CollectionRemoveAction.java:28)
  |     at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:243)
  |     at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:227)
  |     at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:142)
  |     at 
org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:296)
  |     at 
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
  |     at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:905)
  |     at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:345)
  |     at 
org.hibernate.transaction.CacheSynchronization.beforeCompletion(CacheSynchronization.java:59)
  |     at 
org.jboss.tm.TransactionImpl.doBeforeCompletion(TransactionImpl.java:1473)
  |     at org.jboss.tm.TransactionImpl.beforePrepare(TransactionImpl.java:1092)
  |     at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:306)
  |     at org.jboss.tm.TxManager.commit(TxManager.java:224)
  |     at 
org.jboss.portal.common.transaction.Transactions.end(Transactions.java:414)
  |     at 
org.jboss.portal.common.transaction.Transactions$5.noTxAfter(Transactions.java:605)
  |     at 
org.jboss.portal.common.transaction.Transactions.applyAfter(Transactions.java:122)
  |     at 
org.jboss.portal.core.aspects.server.TransactionInterceptor.invoke(TransactionInterceptor.java:85)
  |     at 
org.jboss.portal.server.ServerInterceptor.invoke(ServerInterceptor.java:38)
  |     at 
org.jboss.portal.server.invocation.Invocation.invokeNext(Invocation.java:130)
  |     at 
org.jboss.portal.server.invocation.Invocation.invoke(Invocation.java:175)
  |     at 
org.jboss.portal.server.servlet.PortalServlet.doGet(PortalServlet.java:221)
  |     at 
org.jboss.portal.server.servlet.PortalServlet.doPost(PortalServlet.java:149)
  |     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
  |     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
  |     at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
  |     at 
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
  |     at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
  |     at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
  |     at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
  |     at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
  |     at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
  |     at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
  |     at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
  |     at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
  |     at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
  |     at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
  |     at 
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
  |     at java.lang.Thread.run(Thread.java:595)
  | Caused by: java.sql.SQLException: The executeUpdate method must not return 
a result set.
  |     at 
net.sourceforge.jtds.jdbc.JtdsStatement.processResults(JtdsStatement.java:544)
  |     at 
net.sourceforge.jtds.jdbc.JtdsStatement.executeSQL(JtdsStatement.java:487)
  |     at 
net.sourceforge.jtds.jdbc.JtdsPreparedStatement.executeUpdate(JtdsPreparedStatement.java:421)
  |     at 
org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:227)
  |     at 
org.hibernate.jdbc.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:23)
  |     at 
org.hibernate.persister.collection.AbstractCollectionPersister.remove(AbstractCollectionPersister.java:970)
  |     ... 44 more
  | 
  | 


How can i solve this?

Thanks,
Pedro

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