Patches item #626646, was opened at 2002-10-22 01:51 You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=376687&aid=626646&group_id=22866
Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Rakesh Krishnan (raksk) Assigned to: Nobody/Anonymous (nobody) Summary: Patch for Failover with Sticky Sessions Initial Comment: This patch is for JBoss-3.0.3_Tomcat-4.0.5 (should work with Tomcat4.1.12 as well) . Servers S1 & S2 use sticky sessions + session replication & have distributed apps deployed on them. Kill S1, try to continue in the same session -> loadbalancer redirects to S2, S2 gives NullPointerException (see below ) When using sticky sessions (with jvmRoute appended to JSESSIONID) , failover was not happening because responseThreadLocal.get() was returning null -> since the server on which the thread existed had died. Added code which checks whether a response object exists and addCookie() only if it exists.Also works for condition where the 'dead' server is back 'live' and has re-joined the cluster. Iam basically ignoring the pass where responseThreadLocal.get() returns null, if there was a way to 'revive' a new response in the same pass that would have been better. Here's the exception : 2002-10-14 14:40:21,642 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaServiceSX] Looking for sessions that have expired 2002-10-14 14:40:57,093 DEBUG [org.jboss.web.catalina.EmbeddedCatalinaServiceSX] Looking for session with id=NsLuDM0DMSL+MeuDgdt3Vg**.tomcat1 2002-10-14 14:40:57,103 DEBUG [org.jboss.ha.httpsession.server.ClusteredHTTPSession Service] getHttpSession called for session: NsLuDM0DMSL+MeuDgdt3Vg**.tomcat1 2002-10-14 14:40:58,014 DEBUG [org.jboss.ha.httpsession.server.ClusteredHTTPSession Service] removeHttpSession called for session: NsLuDM0DMSL+MeuDgdt3Vg**.tomcat1 2002-10-14 14:40:58,024 DEBUG [org.javagroups.DefaultPartition] [Mon Oct 14 14:40:58 PDT 2002] [INFO] NAKACK.send(): sending msg #1 2002-10-14 14:40:58,024 DEBUG [org.javagroups.DefaultPartition] [Mon Oct 14 14:40:58 PDT 2002] [INFO] STABLE.startStableTask(): stable task started; num_gossip_runs=3, max_gossip_runs=3 2002-10-14 14:40:58,024 DEBUG [org.jboss.ha.httpsession.server.ClusteredHTTPSession Service] removeHttpSession called for session: NsLuDM0DMSL+MeuDgdt3Vg**.tomcat1 2002-10-14 14:40:58,024 ERROR [org.jboss.ejb.plugins.LogInterceptor] EJBException, causedBy: java.lang.NullPointerException at java.io.ByteArrayInputStream.<init>(Unknown Source) at org.jboss.ejb.plugins.CMPClusteredInMemoryPersistenc eManager.loadEntity (CMPClusteredInMemoryPersistenceManager.java:352) at org.jboss.ejb.plugins.CMPPersistenceManager.loadEntit y(CMPPersistenceManager.java:410) at org.jboss.ejb.plugins.EntitySynchronizationInterceptor.inv oke(EntitySynchronizationInterceptor.java:262) at org.jboss.ejb.plugins.EntityInstanceInterceptor.invoke (EntityInstanceInterceptor.java:152) at org.jboss.ejb.plugins.EntityLockInterceptor.invoke (EntityLockInterceptor.java:107) at org.jboss.ejb.plugins.LogInterceptor.invoke (LogInterceptor.java:203) at org.jboss.ejb.EntityContainer.invoke (EntityContainer.java:493) at org.jboss.ejb.Container.invoke(Container.java:712) at org.jboss.ejb.EntityContainer.invoke (EntityContainer.java:1058) at org.jboss.mx.server.MBeanServerImpl.invoke (MBeanServerImpl.java:517) at org.jboss.invocation.local.LocalInvoker.invoke (LocalInvoker.java:98) at org.jboss.invocation.InvokerInterceptor.invoke (InvokerInterceptor.java:102) at org.jboss.proxy.TransactionInterceptor.invoke (TransactionInterceptor.java:77) at org.jboss.proxy.ejb.HomeInterceptor.invoke (HomeInterceptor.java:189) at org.jboss.proxy.ClientContainer.invoke (ClientContainer.java:76) at $Proxy15.remove(Unknown Source) at org.jboss.ha.httpsession.server.ClusteredHTTPSessionS ervice.removeHttpSession (ClusteredHTTPSessionService.java:153) at java.lang.reflect.Method.invoke(Native Method) at org.jboss.mx.capability.ReflectedMBeanDispatcher.invok e(ReflectedMBeanDispatcher.java:284) at org.jboss.mx.server.MBeanServerImpl.invoke (MBeanServerImpl.java:517) at org.jboss.util.jmx.MBeanProxy.invoke (MBeanProxy.java:174) at $Proxy232.removeHttpSession(Unknown Source) at org.jboss.web.catalina.session.ClusterManager.removeS ession(ClusterManager.java:496) at org.jboss.web.catalina.session.ClusterManager.remove (ClusterManager.java:277) at org.jboss.web.catalina.session.ClusteredSession.setId (ClusteredSession.java:348) at org.jboss.web.catalina.session.ClusterManager.findSessi on(ClusterManager.java:209) at org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:173) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.valves.ErrorDispatcherValve.invoke (ErrorDispatcherValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.valves.AccessLogValve.invoke (AccessLogValve.java:468) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:174) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.ajp.tomcat4.Ajp13Processor.process (Ajp13Processor.java:458) at org.apache.ajp.tomcat4.Ajp13Processor.run (Ajp13Processor.java:551) at java.lang.Thread.run(Unknown Source) ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=376687&aid=626646&group_id=22866 ------------------------------------------------------- This sf.net emial is sponsored by: Influence the future of Java(TM) technology. 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