Orbeon 3.9 ANY User Interaction with form triggers a java.lang.NullPointerException Error

We have a PHP app that uses Orbeon in the background to display forms to the users, Recently we had to come up with the solution for people with the 8080 port blocked so we have installed the jk_mod to serve Tomcat webapps in the vhost file as:

JkMount /orbeon/* geronimo_ajp13
JkMount /ops/* geronimo_ajp13

Users are able to open Orbeon documents but as soon as they perform any Orbeon action (click in the table, submit form etc.) they get following Orbeon error:

enter image description here

Here is my Firebug response (200 ok) when Orbeon action gets triggered:

enter image description here

And here is the orbeon.log error triggered:

    2012-06-21 12:19:21,796 INFO  ProcessorService  - /xforms-server - Received request
2012-06-21 12:19:21,866 ERROR ProcessorService  - Exception at line 55, column 65 of oxf:/ops/xforms/xforms-server.xpl (reading processor output: name='response', id='x
forms-response')
java.lang.NullPointerException
        at org.orbeon.oxf.xforms.state.XFormsStateManager.checkUUIDInSession(XFormsStateManager.java:92)
        at org.orbeon.oxf.xforms.state.XFormsStateManager.findOrRestoreDocument(XFormsStateManager.java:277)
        at org.orbeon.oxf.xforms.processor.XFormsServer.doIt(XFormsServer.java:152)
        at org.orbeon.oxf.xforms.processor.XFormsServer.access$000(XFormsServer.java:56)
        at org.orbeon.oxf.xforms.processor.XFormsServer$1.readImpl(XFormsServer.java:88)
        at org.orbeon.oxf.processor.impl.ProcessorOutputImpl$TopLevelOutputFilter.read(ProcessorOutputImpl.java:263)
        at org.orbeon.oxf.processor.impl.ProcessorOutputImpl.read(ProcessorOutputImpl.java:406)
        at org.orbeon.oxf.processor.ProcessorImpl.readInputAsSAX(ProcessorImpl.java:260)
        at org.orbeon.oxf.processor.pipeline.TeeProcessor$TeeProcessorOutputImpl.readImpl(TeeProcessor.java:89)
        at org.orbeon.oxf.processor.impl.ProcessorOutputImpl$TopLevelOutputFilter.read(ProcessorOutputImpl.java:263)
        at org.orbeon.oxf.processor.impl.ProcessorOutputImpl.read(ProcessorOutputImpl.java:406)
        at org.orbeon.oxf.processor.ProcessorImpl.readInputAsSAX(ProcessorImpl.java:260)
        at org.orbeon.oxf.processor.ProcessorImpl.readInputAsTinyTree(ProcessorImpl.java:286)
        at org.orbeon.oxf.processor.ProcessorImpl$3.read(ProcessorImpl.java:315)
        at org.orbeon.oxf.processor.ProcessorImpl.readCacheInputAsObject(ProcessorImpl.java:365)
        at org.orbeon.oxf.processor.ProcessorImpl.readCacheInputAsObject(ProcessorImpl.java:330)
        at org.orbeon.oxf.processor.ProcessorImpl.readCacheInputAsTinyTree(ProcessorImpl.java:313)
        at org.orbeon.oxf.processor.pipeline.choose.ConcreteChooseProcessor.start(ConcreteChooseProcessor.java:186)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor$5.run(PipelineProcessor.java:661)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor.executeChildren(PipelineProcessor.java:726)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor.start(PipelineProcessor.java:658)
        at org.orbeon.oxf.processor.pipeline.choose.ConcreteChooseProcessor.start(ConcreteChooseProcessor.java:248)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor$5.run(PipelineProcessor.java:661)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor.executeChildren(PipelineProcessor.java:726)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor.start(PipelineProcessor.java:658)
        at org.orbeon.oxf.pipeline.InitUtils.runProcessor(InitUtils.java:89)
        at org.orbeon.oxf.webapp.ProcessorService.service(ProcessorService.java:97)
        at org.orbeon.oxf.servlet.OrbeonServletDelegate.service(OrbeonServletDelegate.java:133)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
        at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
        at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:769)
        at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:698)
        at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:891)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
        at java.lang.Thread.run(Thread.java:636)

Does anybody know what is going on?

Solution

That error clearly indicates that a session cookie is not propagated for some reason. I would check into that.