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From: Lars Francke <lars.francke@gmail.com>
Date: Tue, 30 Apr 2013 18:13:09 +0200
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Subject: [digester] Annotations handled multiple times
To: user@commons.apache.org
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Hi,

I'm using the Digester Annotations and everything works pretty well
(looking forward to 3.3 for DIGESTER-174).

We have a model where we share a "contact" class and have that
annotated with an @ObjectCreate.List because it can live under
multiple different elements and a tree-like structure where the top
level element contains other elements that in turn have "contacts".

Here's a simplified version of the schema:
A(/a) has B(/a/b)
A(/a) has C(/a/c)

B has D(/a/b/d + /a/c/d)
C has D(/a/b/d + /a/c/d)

The problem now is that the AnnotationHandler processes the D element
multiple times because it's being reached through multiple branches of
the "tree", thus creating multiple instances of the ObjectCreateRule
which are all fired and obviously screw up the stack.

To me this seems like a bug and the AnnotationHandlers should check if
they have already visited an element. I'm happy to file a JIRA but I
wasn't sure if this might not be intended behavior for some reason I
don't understand yet. Also: I might be completely wrong in my
diagnosis of this problem.

Any help is greatly appreciated.

Cheers,
Lars

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