I always get the same error when i set the option "distributable" to true in the web.xml descriptor. I´m trying to deploy the "hello world" application into a glassfish cluster. I need to check this option in order to share session inside the cluster.

Just when i write the url in the webbrowser i get this error. PWC2788: setAttribute: Non-serializable attribute with name javax.zkoss.zk.ui.Session.

It happens with all the applications. To reproduce the error just put "distributable" to true and deploy into glassfish. Any ideas? Thanks.

Details.

Advertencia: StandardWrapperValve[zkLoader]: PWC1406: Servlet.service() for servlet zkLoader threw exception
java.lang.IllegalArgumentException: PWC2788: setAttribute: Non-serializable attribute with name javax.zkoss.zk.ui.Session
at org.apache.catalina.session.ManagerBase.checkSessionAttribute(ManagerBase.java:829)
at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1713)
at org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:178)
at org.zkoss.zk.ui.http.SimpleSessionCache.put(SimpleSessionCache.java:42)
at org.zkoss.zk.ui.sys.SessionsCtrl.newSession(SessionsCtrl.java:152)
at org.zkoss.zk.ui.http.WebManager.getSession(WebManager.java:404)
at org.zkoss.zk.ui.http.WebManager.getSession(WebManager.java:385)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:130)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)