Allow to use different ExpressionFactory implementation
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                 Key: MYFACES-1902
                 URL: https://issues.apache.org/jira/browse/MYFACES-1902
             Project: MyFaces Core
          Issue Type: New Feature
          Components: Extension Feature
    Affects Versions: 1.2.4-SNAPSHOT
            Reporter: Christian Kaltepoth


It should be possible to use a different ExpressionFactory implementation. This 
feature is required
to use 3rd party EL implementations like JBoss EL. Mojarra already supports 
this with the
'com.sun.faces.expressionFactory' context parameter.

MyFaces Core 1.2.x already supports a context parameter 
'org.apache.myfaces.EXPRESSION_FACTORY'
but it is only evaluated in a JSP 2.0 environment (see MYFACES-1693 for 
details).

It should be possible to use this parameter with JSP 2.1 as well. The 
corresponding code
should be refactored from Jsp20FacesInitializer to AbstractFacesInitializer to 
be usable in both
JSP 2.0 and 2.1.

Discussion on myfaces-users:

http://www.nabble.com/Replacing-expression-factory-td18867420.html


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