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#294 Patch for Failover with Sticky Sessions
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)
ClusterManager.java
tomcat4-service.jar
Logged In: YES
user_id=633640
tomcat4-service.jar .. if you dont want to compile :)