URGENT: Replication of Session Data doesn't work properly

We have an envirnoment that consist of 2 physical machine, two wls-server
 instances on each of these, and two wls-clusters. One of the clusters have
 light workload, the other that are our problem have a heavy workload. We
 have a BIG-IP load balancer in front of the two wls-machines, that is
 configured according to BEA's documentation. On each machine we have
 installed Apache-webserver, with wls proxy plugin. Each virtual host in
 apache is configured with the cluster machines, and idempotent ON.
 We have two web-apps running in the cluster which we are experiencing the
 problems with.
 We can start all the servers, and everything works fine, except that the
 serverlogs are full of the messages I have put at the end og this message.
 After A while one of the servers just dissappears from the console (running
 is missing). But both servers handles requests (I think that is because the
 load balancer and Apache still redirects sessions to both server-intances).
 The questions are:
 1. What does the text from the server logs mean?
 2. What can we do to correct the problem?
 3. Why does one of the servers just disappear from "Servers | running"?
 We have set PersistentStoreType to replicated in weblogic.xml.
 Regards
 Tommy
 May 16, 2002 11:15:08 AM CEST www3_a Error HTTP
 [WebAppServletContext(6060948,oppslag,/oppslag)] Servlet fai
 led with Exception
 java.lang.NullPointerException
 at
 weblogic.servlet.internal.session.SessionData.<init>(SessionData.java:117)
 at
 weblogic.servlet.internal.session.ReplicatedSessionData.<init>(ReplicatedSes
 sionData.java:73)
 at
 weblogic.servlet.internal.session.ReplicatedSessionContext.getNewSession(Rep
 licatedSessionContext.java:189)
 at
 weblogic.servlet.internal.ServletRequestImpl.getNewSession(ServletRequestImp
 l.java:2111)
 at
 weblogic.servlet.internal.ServletRequestImpl.getSession(ServletRequestImpl.j
 ava:1925)
 at
 jsp_servlet._oppslag._enhet.__treffliste._jspService(__treffliste.java:85)
 at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
 at
 weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
 :265)
 at
 weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
 :200)
 at
 weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
 ntext.java:2495)
 at
 weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
 :2204)
 at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
 at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

Yes, we are using WLS 6.1 SP2
 We have installed the patch, and the problem is resolved.
 Thank you.
 Regards
 Tommy
 "Kumar Allamraju" <[email protected]> wrote in message
 news:[email protected]...
 > Before i comment on the problem i need to know the weblogic ver & SP
 level.
 >
 > Regarding the NPE, it's a known issue
 > Pls contact support and reference CR064294. This NPE is already fixed
 > for the next service pack 61 SP3.
 >
 > --
 > Kumar
 >
 >
 >
 > Tommy Larsen wrote:
 >
 > > We have an envirnoment that consist of 2 physical machine, two
 wls-server
 > > instances on each of these, and two wls-clusters. One of the clusters
 have
 > > light workload, the other that are our problem have a heavy workload. We
 > > have a BIG-IP load balancer in front of the two wls-machines, that is
 > > configured according to BEA's documentation. On each machine we have
 > > installed Apache-webserver, with wls proxy plugin. Each virtual host in
 > > apache is configured with the cluster machines, and idempotent ON.
 > >
 > > We have two web-apps running in the cluster which we are experiencing
 the
 > > problems with.
 > >
 > > We can start all the servers, and everything works fine, except that the
 > > serverlogs are full of the messages I have put at the end og this
 message.
 > >
 > > After A while one of the servers just dissappears from the console
 (running
 > > is missing). But both servers handles requests (I think that is because
 the
 > > load balancer and Apache still redirects sessions to both
 server-intances).
 > >
 > > The questions are:
 > > 1. What does the text from the server logs mean?
 > > 2. What can we do to correct the problem?
 > > 3. Why does one of the servers just disappear from "Servers | running"?
 > >
 > > We have set PersistentStoreType to replicated in weblogic.xml.
 > >
 > > Regards
 > >
 > > Tommy
 > >
 > >
 > > May 16, 2002 11:15:08 AM CEST www3_a Error HTTP
 > > [WebAppServletContext(6060948,oppslag,/oppslag)] Servlet fai
 > >
 > > led with Exception
 > >
 > > java.lang.NullPointerException
 > > at
 > >
 weblogic.servlet.internal.session.SessionData.<init>(SessionData.java:117)
 > > at
 > >
 weblogic.servlet.internal.session.ReplicatedSessionData.<init>(ReplicatedSes
 > > sionData.java:73)
 > > at
 > >
 weblogic.servlet.internal.session.ReplicatedSessionContext.getNewSession(Rep
 > > licatedSessionContext.java:189)
 > > at
 > >
 weblogic.servlet.internal.ServletRequestImpl.getNewSession(ServletRequestImp
 > > l.java:2111)
 > > at
 > >
 weblogic.servlet.internal.ServletRequestImpl.getSession(ServletRequestImpl.j
 > > ava:1925)
 > > at
 > >
 jsp_servlet._oppslag._enhet.__treffliste._jspService(__treffliste.java:85)
 > > at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
 > > at
 > >
 weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
 > > :265)
 > > at
 > >
 weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
 > > :200)
 > > at
 > >
 weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
 > > ntext.java:2495)
 > > at
 > >
 weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
 > > :2204)
 > > at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
 > > at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
 > >
 > >
 > >
 > >
 > >
 > >
 >

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Run now
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The Automatically diagnose and fix common problems with CD or DVD drives troubleshooter may automatically fix the problem described in this article.
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