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Posted to dev@myfaces.apache.org by "Jay Sartoris (JIRA)" <de...@myfaces.apache.org> on 2015/04/27 16:30:38 UTC

[jira] [Created] (MYFACES-3986) viewScope implicit object not resolved in a JSP page

Jay Sartoris created MYFACES-3986:
-------------------------------------

             Summary: viewScope implicit object not resolved in a JSP page
                 Key: MYFACES-3986
                 URL: https://issues.apache.org/jira/browse/MYFACES-3986
             Project: MyFaces Core
          Issue Type: Bug
          Components: JSR-344
    Affects Versions: 2.2.8
            Reporter: Jay Sartoris


Consider this scenario:

A JSP file has the following contents:
=============
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
          "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://xmlns.jcp.org/jsf/core"
      xmlns:c="http://xmlns.jcp.org/jsp/jstl/core" >
<body>
<f:view>
 <h:form id="form1">
  <c:set target="${viewScope}" property="test" value="testValue2" />
  <h:outputText id="foo1" value="#{viewScope.test}" />
 </h:form>
</f:view>
</body>
</html>
============

When requested (with the faces mapping), it fails with this exception:
javax.servlet.jsp.JspTagException:
at org.apache.taglibs.standard.tag.common.core.SetSupport.doEndTag(SetSupport.java:195)
at [internal classes]

The reason for that exception is because the target attribute with a value of "viewScope" of the c:set tag was resolved to null. 

The Problem:
-----------
I think the issue here is that the wrong FacesCompositeELResolver is used while processing the tags.  From my debugging, I see that there are two FacesCompositeELResolvers created in this scenario and also what is mentioned in the JSF 2.2 spec, section 5.6.  One with JSP scope and one with Faces scope.  The ImplicitElResolvers created in each of these scopes is different as detailed in the spec.  
The problem I see is that when processing the tags, the Faces scoped ELResolvers are created, but not used when processing the c:set tag to resolve the viewScope implicit map.  When processing this tag, it will use the JSP scoped resolvers and therefore cannot resolve the viewScope and throws the exception mentioned above because the org.apache.myfaces.el.unified.resolver.implicitobject.ViewScopeImplicitObject is never called as it is only associated with a Faces scoped ImplicitObjectResolver.

Even though this is a JSP file, shouldn't the Faces scoped resolvers be used when this is a JSF file? 
 
This same scenario works on Mojarra 2.2.10 with Tomcat 8.0.15, but fails when using MyFaces.



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