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From "Mads Peter Henderson (JIRA)" <...@myfaces.apache.org>
Subject [jira] Created: (MYFACES-1392) NullPointerException in SessionMap.setAttribute
Date Fri, 25 Aug 2006 09:04:22 GMT
NullPointerException in SessionMap.setAttribute
-----------------------------------------------

                 Key: MYFACES-1392
                 URL: http://issues.apache.org/jira/browse/MYFACES-1392
             Project: MyFaces Core
          Issue Type: Bug
          Components: General
    Affects Versions: 1.1.3
            Reporter: Mads Peter Henderson


I frequently - but far from always get a NPE when I use the variable resolver to resolve a
session scope variable. Does anyone have any idea of what I am doing wrong?

The setup is this.

I have set up a session scope backing bean let's call it my myBean.
I have a servlet that generates graphic elements for some pages based on the information in
myBean.

In the servlet I do the following:

    FacesContext facesContext = FacesContext.getCurrentInstance();
    if (facesContext == null) {
      FacesContextFactory fcf =
        (FacesContextFactory) FactoryFinder.getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);
      LifecycleFactory lifecycleFactory =
        (LifecycleFactory) FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY);
      facesContext = fcf.getFacesContext(getServletContext(),
        req,
        resp,
        lifecycleFactory.getLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE ));
    }

    if (facesContext != null) {
      VariableResolver vr = facesContext.getApplication().getVariableResolver();
      if (vr != null) {
        Object o = vr.resolveVariable(facesContext, "myBean");
      }
    }

As I started to say the line:
vr.resolveVariable(facesContext, "myBean");
somtimes throw a NPE with the following trace:
java.lang.NullPointerException
        at
org.apache.myfaces.context.servlet.SessionMap.setAttribute(SessionMap.java:50)
        at
org.apache.myfaces.context.servlet.AbstractAttributeMap.put(AbstractAttributeMap.java:104)
        at
org.apache.myfaces.el.VariableResolverImpl$13.put(VariableResolverImpl.java:192)
        at
org.apache.myfaces.el.VariableResolverImpl.resolveVariable(VariableResolverImpl.java:328)
        at
org.apache.myfaces.config.LastVariableResolverInChain.resolveVariable(LastVariableResolverInChain.java:42)

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