[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-959) NullPointerException in ConversationEntry if stack is null

[Andrew (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBSEAM-959?page=comments#action_12356597 ] 
            
Andrew commented on JBSEAM-959:
-------------------------------

In terms of being able to reproduce, the full stack trace is below. I got this when I was using ajaxSingle = true with an AJAX support component from Ajax4JSF. It happens in the RESTORE_VIEW phase. Also, I saw that there was no stored conversation which also could be part of the problem as I did have a conversation active at the time (I think maybe my onblur handler and my onchange handler of a component got fired at the same time).

13:48:00,493 DEBUG [Manager] No stored conversation, or concurrent call to the stored conversation
13:48:00,546 ERROR [ExceptionLogFilter] An unexpected error was thrown on the server in a servlet
java.lang.NullPointerException
        at org.jboss.seam.core.ConversationEntry.<init>(ConversationEntry.java:44)
        at org.jboss.seam.core.ConversationEntries.createConversationEntry(ConversationEntries.java:50)
        at org.jboss.seam.core.Manager.createConversationEntry(Manager.java:649)
        at org.jboss.seam.core.Manager.beforeRedirect(Manager.java:796)
        at org.jboss.seam.core.Manager.appendConversationIdFromRedirectFilter(Manager.java:1004)
        at org.jboss.seam.servlet.SeamRedirectFilter$1.sendRedirect(SeamRedirectFilter.java:46)
        at org.apache.myfaces.context.servlet.ServletExternalContextImpl.redirect(ServletExternalContextImpl.java:493)
        at org.ajax4jsf.framework.ajax.AjaxViewHandler.restoreView(AjaxViewHandler.java:177)
        at org.jboss.seam.jsf.SeamViewHandler.restoreView(SeamViewHandler.java:64)
        at org.jenia.faces.template.handler.ViewHandler.restoreView(ViewHandler.java:263)
        at com.sun.facelets.FaceletViewHandler.restoreView(FaceletViewHandler.java:321)
        at org.ajax4jsf.framework.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:116)
        at org.ajax4jsf.framework.ajax.AjaxViewHandler.restoreView(AjaxViewHandler.java:147)
        at org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:81)
        at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:95)
        at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:70)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:139)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:29)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:96)
        at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:220)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:190)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at com.outlooksoft.cpm.servlet.AjaxHtmlHeadFilter.doFilter(AjaxHtmlHeadFilter.java:60)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at com.outlooksoft.cpm.servlet.ExceptionLogFilter.doFilter(ExceptionLogFilter.java:43)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at com.outlooksoft.cpm.security.SecurityFilter.doFilter(SecurityFilter.java:197)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
        at java.lang.Thread.run(Thread.java:595)

> NullPointerException in ConversationEntry if stack is null
> ----------------------------------------------------------
>
>                 Key: JBSEAM-959
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-959
>             Project: JBoss Seam
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.2.0.GA
>            Reporter: Keith Naas
>         Assigned To: Pete Muir
>             Fix For: 1.2.1.GA
>
>
> When the conversation stack is null, the ConversationEntry constructor throws a NullPointerException.
> There is a conditional check earlier in the constructor that causes the conversationIdStack to be set to null.  Then later it checks to see if the stack size is greater than 1.  Kablooey!
> changed to
>  if ( conversationIdStack != null && conversationIdStack.size()>1 )

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