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From "Bill Lucy (JIRA)" <>
Subject [jira] [Created] (MYFACES-4044) Flow ID Ambiguity Is Not Handled Well
Date Mon, 25 Apr 2016 17:47:12 GMT
Bill Lucy created MYFACES-4044:

             Summary: Flow ID Ambiguity Is Not Handled Well
                 Key: MYFACES-4044
             Project: MyFaces Core
          Issue Type: Improvement
    Affects Versions: 2.2.9
            Reporter: Bill Lucy

If we have multiple flows with the same IDs and definingDocumentIds, we won't behave as expected:
only one flow will actually be used, but no error or warning to that effect is emitted.

Consider if we have two apps in the same EAR, each defining flows with an ID of "sample-flow",
like this:

        final String flowId = "sample-flow";"", flowId);

Per the JSF spec, this creates ambiguity:
Defining Flows
Flows are defined using the <flow-definition> element. This element must have an id
attribute which uniquely
identifies the flow within the scope of the Application Configuration Resource file in which
the element appears. To
enable multiple flows with the same id to exist in an application, the <faces-config><name>
element is taken to
be the definingDocumentId of the flow. If no <name> element is specified, the empty
string is taken as the value
for definingDocumentId.

In this case, app1 might define some kind of initializer with the flow, while app2 doesn't.
 In that case, app2 might (incorrectly) end up trying to use an initializer that was intended
for app1.  A developer might see issues resulting from the initializer being called from the
wrong app, but it wouldn't be clear that the wrong flow had been entered (due to ambiguity).

Mojarra has something like this:
Caused by: java.lang.IllegalStateException: Flow with id \"sample-flow\" and definingDocumentId
\"\" already exists."}}

I think that MyFaces should emit some kind of similar warning/error in the given scenario.

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