I've been working on getting session replication working with portlets
in uPortal (which uses Pluto's container). I ran into a block with
tomcat that I thought folks here might be interested in. I've attached
the email I just sent to the tomcat-users list.
-Eric Dalquist
--- Begin Message ---
I have been working on getting session replication working for a set of
web applications that use cross context dispatching.
I ran into a problem where the session for the context the request is
being made to is being replicated correctly but the session for the
context(s) being dispatched to are not being replicated at all.
The contextA servlet handling the request modifies its session then does
a cross context dispatch to another servlet in contextB which also
modifies its session. In this case two different sessions (one for
contextA and another for contextB) have been modified. After the request
is complete only the contextA session is replicated.
After a fair amount of digging into the tomcat code I think I have an
understanding of how session replication works and what is going on in
this case.
The following stack trace was captured just before the servlet in
contextB is called. The stack items above and below the lines is tomcat
code.
From what I've been able to figure out configuring Clustering in tomcat
adds the ReplicationValve to the chain of valves the request goes
through before getting to the servlet. After the servlet is called this
valve calls the Manager for this context to inform it the request is
complete and that replication should be done. The ReplicationValve is in
the bottom 1/3 of the stack.
In the top 1/3 of the stack is the tomcat code to execute a cross
context dispatch. There is no ReplicationValve or other filter in this
stack so after the dispatch is complete there is no code called to
inform the manager of the other context that the request is complete and
replication should be performed.
Is there any way to get tomcat to replicate the session for contexts
that are accessed via cross context dispatches during a request?
Thank you
-Eric Dalquist
Thread [TSP-Processor3] (Suspended)
ApplicationFilterChain.internalDoFilter(ServletRequest,
ServletResponse) line: 234
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse)
line: 173
ApplicationDispatcher.invoke(ServletRequest, ServletResponse) line: 672
ApplicationDispatcher.doInclude(ServletRequest, ServletResponse)
line: 574
ApplicationDispatcher.include(ServletRequest, ServletResponse) line: 499
--------------------------------------------------------------------------
PortletInvokerImpl.invoke(PortletRequest, PortletResponse, Integer)
line: 120
PortletInvokerImpl.action(ActionRequest, ActionResponse) line: 68
PortletContainerImpl.processPortletAction(PortletWindow,
HttpServletRequest, HttpServletResponse) line: 150
CPortletAdapter.setRuntimeData(ChannelRuntimeData, String) line: 578
MultithreadedPrivilegedCacheableDirectResponseCharacterChannelAdapter(MultithreadedCharacterChannelAdapter).setRuntimeData(ChannelRuntimeData)
line: 29
ChannelManager.feedRuntimeDataToChannel(IChannel, HttpServletRequest)
line: 896
ChannelManager.processRequestChannelParameters(HttpServletRequest)
line: 841
ChannelManager.startRenderingCycle(HttpServletRequest,
HttpServletResponse, UPFileSpec) line: 981
UserInstance.processPortletActionIfNecessary(HttpServletRequest,
HttpServletResponse) line: 203
UserInstance.writeContent(HttpServletRequest, HttpServletResponse)
line: 177
PortalSessionManager.doGet(HttpServletRequest, HttpServletResponse)
line: 253
PortalSessionManager(HttpServlet).service(HttpServletRequest,
HttpServletResponse) line: 689
PortalSessionManager(HttpServlet).service(ServletRequest,
ServletResponse) line: 802
--------------------------------------------------------------------------
ApplicationFilterChain.internalDoFilter(ServletRequest,
ServletResponse) line: 252
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse)
line: 173
StandardWrapperValve.invoke(Request, Response) line: 213
StandardContextValve.invoke(Request, Response) line: 178
StandardHostValve.invoke(Request, Response) line: 126
ReplicationValve.invoke(Request, Response) line: 145
ErrorReportValve.invoke(Request, Response) line: 105
StandardEngineValve.invoke(Request, Response) line: 107
CoyoteAdapter.service(Request, Response) line: 148
JkCoyoteHandler.invoke(Msg, MsgContext) line: 307
HandlerRequest.invoke(Msg, MsgContext) line: 385
ChannelSocket.invoke(Msg, MsgContext) line: 748
ChannelSocket.processConnection(MsgContext) line: 678
SocketConnection.runIt(Object[]) line: 871
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