With the current release of JDeveloper, the page flow diagram is not set up to handle Tiles (XML) definition references directly. Thus an Action definition such as:
Will not display correctly on the diagram and the Action will show with the following icon , indicating that the Struts Diagram cannot find the underlying page.
Additionally if you try and create a Forward which uses an XML Tiles definition as the path attribute then additional 'phantom' pages will be created on the diagram .
To avoid this problem you can either choose to work without the diagram enabled (see the technical tip 'Suppressing the Struts Page Flow Diagram' on OTN) or you can define ActionForwards for each Tiles definition you will need as Forward targets in the flow. If you choose this technique then the flow will be correctly represented in the diagram, however, the ActionForwards will still be shown with the warning icon. Future versions of JDeveloper will recognize Tiles definitions as valid forward targets."
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