Erro no Hibernate quando faço UPDATE em duas tabelas!

Pessoal,

Tenho as tabelas: Cidades[color=blue]----[/color]Bairros[color=blue]----[/color]Enderecos[color=blue]----[/color]Nucleos[color=blue]----[/color]Membros

As tabelas estão devidamentes mapeadas funcionando para Consultas e Cadastros.

Meu problema está ocorrendo quando faço uma Atualização… se na atualização ao altero os dados apenas do Nucleo ou do Endereco ou do Membro (Líder) funciona. Agora quandos as modificações exigem um UPDATE em duas tabelas (Nucleos - cod_Lider e Endereco - cod_bairro) ocorre o seguinte erro…

org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions at org.hibernate.collection.AbstractPersistentCollection.setCurrentSession(AbstractPersistentCollection.java:410) at org.hibernate.event.def.OnUpdateVisitor.processCollection(OnUpdateVisitor.java:40) at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:101) at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:61) at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:55) at org.hibernate.event.def.AbstractVisitor.process(AbstractVisitor.java:123) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:268) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:217) at org.hibernate.event.def.DefaultUpdateEventListener.performSaveOrUpdate(DefaultUpdateEventListener.java:33) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70) at org.hibernate.impl.SessionImpl.fireUpdate(SessionImpl.java:566) at org.hibernate.impl.SessionImpl.update(SessionImpl.java:554) at org.hibernate.impl.SessionImpl.update(SessionImpl.java:546) at webigreja.hibernate.HibernateGenericDAO.update(HibernateGenericDAO.java:31) at sistema.nucleo.NucleoDAO.update(NucleoDAO.java:21) at sistema.nucleo.NucleoUpdateAction.execute(NucleoUpdateAction.java:55) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1062) at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263) at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386) at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) 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.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.Http11AprProcessor.process(Http11AprProcessor.java:833) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:639) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1285) at java.lang.Thread.run(Unknown Source)

Estou usando ThreadLocal e fechando a session após o UPDATE.

Alguém pode por favor me ajudar?