hi every one this is my project environment jboss seam: 2.1.0.A1 jboss server:4.2.2.GA I my page I display the huge amount of data displayed in the form of table. I fetch those data by using EJP 3 by using PersistenceContext. When more than one person try to access that particular page at a time I got following exception | 04:59:34,837 WARN [arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator_2] TwoPhaseCoordinator.beforeCompletion - failed for com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple@1c7ee02f | javax.persistence.PersistenceException: org.hibernate.HibernateException: Flush during cascade is dangerous | at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:629) | at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:524) | at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:114) | at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:247) | at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:86) | at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177) | at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1389) | at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:135) | at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:87) | at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.commit(ServerVMClientUserTransaction.java:140) | at org.jboss.seam.transaction.UTTransaction.commit(UTTransaction.java:52) | at org.jboss.seam.jsf.SeamPhaseListener.commitOrRollback(SeamPhaseListener.java:605) | at org.jboss.seam.jsf.SeamPhaseListener.handleTransactionsAfterPageActions(SeamPhaseListener.java:352) | at org.jboss.seam.jsf.SeamPhaseListener.preRenderPage(SeamPhaseListener.java:571) | at org.jboss.seam.jsf.SeamPhaseListener.beforeRenderResponse(SeamPhaseListener.java:473) | at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:146) | at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:116) | at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:222) | at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144) | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) | at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:73) | at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141) | at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281) | at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) | at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) | at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) | at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) | at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446) | at java.lang.Thread.run(Thread.java:595) | Caused by: org.hibernate.HibernateException: Flush during cascade is dangerous | at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:996) | at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338) | at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:515) | ... 56 more | How can I fix this exception? by thiagu.m View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4153160#... 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