Provide annotation processor warning for conditiional forwards with duplicate 
expressions
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                 Key: BEEHIVE-1146
                 URL: http://issues.apache.org/jira/browse/BEEHIVE-1146
             Project: Beehive
          Issue Type: Improvement
          Components: NetUI
    Affects Versions: 1.0.1
            Reporter: Troy Beecroft
            Priority: Minor


Currently if you create a simple action with more than one conditional forward, 
and two of these forwards have the same expression, there is no warning 
generated by the annotation processor.  This scenario could probably happen 
easily enough via cut and paste error...  and since one of the forwards is 
effectively dropped quietly at run time, it'd be a nice check to add.

Here's an example of the situation:

@Jpf.Controller
  (simpleActions = {
    @Jpf.SimpleAction(name = "anAction", path = "index.jsp", 
conditionalForwards = {
        @Jpf.ConditionalForward(condition = "${pageFlow.myProperty}", path = 
"some.jsp"), 
        @Jpf.ConditionalForward(condition = "${pageFlow.myProperty}", path = 
"another.jsp") }) })

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