title: Struts2 + Full Hibernate Plugin --> Session is Closed?
body: <p>Related to this question (where the answer doesn't really get to the point):</p>
  
  <p><a href="https://stackoverflow.com/questions/5901137/hiberate-with-struts2-use-full-hibernate-plugin-or-another-method-to-close-sess">Hiberate with Struts2 - Use Full Hibernate Plugin or another method to close Sessions?</a></p>
  
  <p>I have the same setup: Struts 2.2.3 and the struts2-fullhibernatecore-plugin-2.2.2-GA . I have none of the defaults changed for Struts2 and for the Plugin. I'm using MySQL, no additional connection pooling, and nothing fancy in general.</p>
  
  <p>I use the following code in my Action:</p>
  
  <pre><code>FeedGroup persistent = null;
  List&lt;FeedGroup&gt; list = objectList = (List&lt;FeedGroup&gt;) session.createCriteria(FeedGroup.class)
          .setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY)
          .list();
  if (feedgroup.getId() != 0) // a new one
  {
      persistent = (FeedGroup) session.get(FeedGroup.class, id);
  }
  if (persistent != null)
  {
      persistent.copyValuesFromOther(feedgroup);
      session.update(persistent);
  }
  else
      session.save(feedgroup);
  
  return list;
  </code></pre>
  
  <p>This gives me the following exception <em>only in about every 10 cases or so</em>, which doesn't happen in my code, but likely after the transaction got committed by the plugin.</p>
  
  <pre><code>org.hibernate.SessionException: Session is closed!
  
  org.hibernate.impl.AbstractSessionImpl.errorIfClosed(AbstractSessionImpl.java:72)
  org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1346)
  abelssoft.newspaper.actions.ActionHelper.prepare(ActionHelper.java:65)
  com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:167)
  com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
  org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
  com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
  com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
  org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
  org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
  org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
  org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
  org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
  org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
  org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
  org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
  org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
  org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
  org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317)
  org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204)
  org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311)
  java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  java.lang.Thread.run(Thread.java:619)
  </code></pre>
  
  <p>Is it a problem in the logic of my code or is it a problem related to the Plugin? If the latter, can a configuration change help? I'd like to use the plugin as it is, I'm just worried that it doesn't work reliably or that my understanding of Database stuff is too primitive and that my code needs rewriting ;-).</p>