DO NOT REPLY [Bug 13673] New: - Problem in StandardSession when writing a session manager

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=13673

Problem in StandardSession when writing a session manager

           Summary: Problem in StandardSession when writing a session
                    manager
           Product: Tomcat 4
           Version: Unknown
          Platform: PC
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: hek@asu.edu


Hi,

I am trying to write my own session manager and am having limited success.  I 
have written my session manager and get a NullPointerException inside 
setAttribute (see stack trace below).  Looking at the code, I don't the 
StandardSession objects serialize themselves properly.  The read/writeObject 
methods document they do not serialize the manager and it must be set 
explicitly.  I'm guessing it is not set after the the StandardSession is
recovered from the stream.  I am assuming that my session manager does not need 
to reset the manager as that's internal to catalina and the facade blocks 
assess to the get/set manager methods.

I would be glad to send code that reproduce this problem or try patches to help 
resolve the problem.

Many thanks,
Harry.

java.lang.NullPointerException
	at org.apache.catalina.session.StandardSession.setAttribute
(StandardSession.java:1268)
	at org.apache.catalina.session.StandardSessionFacade.setAttribute
(StandardSessionFacade.java:191)
	at org.apache.catalina.session.StandardSessionFacade.setAttribute
(StandardSessionFacade.java:191)
	at Session1.doGet(Unknown Source)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:247)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.StandardWrapperValve.invoke
(StandardWrapperValve.java:260)
	at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNex
t(StandardPipeline.java:643)
	at org.apache.catalina.core.StandardPipeline.invoke
(StandardPipeline.java:480)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at org.apache.catalina.core.StandardContextValve.invoke
(StandardContextValve.java:191)
	at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNex
t(StandardPipeline.java:643)
	at org.apache.catalina.core.StandardPipeline.invoke
(StandardPipeline.java:480)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at org.apache.catalina.core.StandardContext.invoke
(StandardContext.java:2396)
	at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:180)
	at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNex
t(StandardPipeline.java:643)
	at org.apache.catalina.valves.ErrorDispatcherValve.invoke
(ErrorDispatcherValve.java:170)
	at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNex
t(StandardPipeline.java:641)
	at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:172)
	at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNex
t(StandardPipeline.java:641)
	at org.apache.catalina.core.StandardPipeline.invoke
(StandardPipeline.java:480)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:174)
	at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNex
t(StandardPipeline.java:643)
	at org.apache.catalina.core.StandardPipeline.invoke
(StandardPipeline.java:480)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at org.apache.coyote.tomcat4.CoyoteAdapter.service
(CoyoteAdapter.java:223)
	at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:405)
	at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnectio
n(Http11Protocol.java:380)
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt
(PoolTcpEndpoint.java:508)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run
(ThreadPool.java:533)
	at java.lang.Thread.run(Thread.java:536)

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