Crud, this is probably a tomcat list question. This hasn't happened until recently though, and the only thing that's really changed is jsf2 versions
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-----Original Message-----
From: Ryan Lubke <Ryan.Lubke_at_Sun.COM>
Date: Mon, 06 Apr 2009 15:16:11
To: <webtier_at_glassfish.dev.java.net>
Subject: Re: [webtier] JSF/JSF2 Seemingly random NullPointerExceptions in
request.get/setAttribute() using Filters
On 4/6/09 3:04 PM, Lincoln Baxter, III wrote:
> Hi Gurus,
>
> Got a question...
Since it seems that this may be a container issue, what container are
you using?
>
> I'm using PrettyFaces for JSF (trying to update it for JSF2,) and I
> started getting some NullPointerExceptions that I don't feel like were
> occurring before.
>
> Here are the steps that occur:
>
> 1. PrettyFaces intercepts all requests to the WebApp, it checks
> against a configuration file to determine whether or not that request
> should be forwarded to JSF.
>
> 2. PrettyFaces then constructs a FacesContext in order to do some work
> with FacesMessages, :
>
> public FacesContext getFacesContext(final ServletRequest request,
> final ServletResponse response)
> {
> FacesContext facesContext = FacesContext.getCurrentInstance();
> if (facesContext != null)
> {
> return facesContext;
> }
>
> FacesContextFactory contextFactory = (FacesContextFactory)
> FactoryFinder
> .getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);
> LifecycleFactory lifecycleFactory = (LifecycleFactory)
> FactoryFinder
> .getFactory(FactoryFinder.LIFECYCLE_FACTORY);
> Lifecycle lifecycle =
> lifecycleFactory.getLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE);
>
> ServletContext servletContext = ((HttpServletRequest)
> request).getSession().getServletContext();
> facesContext = contextFactory.getFacesContext(servletContext,
> request, response, lifecycle);
> InnerFacesContext.setFacesContextAsCurrentInstance(facesContext);
>
> return facesContext;
> }
>
> 3. PrettyFaces constructs a PrettyContext and PrettyConfig object, and
> stores them using request.setAttribute()
>
> 4. PrettyFaces forwards to JSF (or not, if not applicable)
>
> It seems like these attributes are sometimes lost during the forward
> to the JSF servlet. This must have something to do with threading and
> forwards, but I can't seem to narrow it down. Any help would be
> greatly appreciated.
>
> Sometimes the Exceptions occur even before the forward to JSF.
>
> Caused by: java.lang.NullPointerException
> at
> org.apache.catalina.connector.Request.setAttribute(Request.java:1424)
> at
> org.apache.catalina.connector.RequestFacade.setAttribute(RequestFacade.java:503)
> at
> javax.servlet.ServletRequestWrapper.setAttribute(ServletRequestWrapper.java:284)
> at
> com.ocpsoft.pretty.PrettyContext.setCurrentInstance(PrettyContext.java:93)
> at
> com.ocpsoft.pretty.PrettyContext.getCurrentInstance(PrettyContext.java:84)
> at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:58)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at
> com.ocpsoft.socialpm.jsf.filter.DataSetupFilter.doFilter(DataSetupFilter.java:255)
> at
> org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
> at
> org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at
> org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
> at
> org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
> at
> org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
> at
> org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
>
>
> Where and how should I start trying to debug these random NPEs?
>
>
> Thanks,
> Lincoln
>
>
>