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Target Release:

7.1.0.GA
Git Pull Request:
https://github.com/jbossas/jboss-eap7/pull/1132
Steps to Reproduce:

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Create session attribute containing an unmodifiable collection of immutable objects.
e.g.
HttpSession.setAttribute("foo", Collection.singleton("bar"));

On subsequent request, lookup attribute created above.
e.g.
HttpSession.getAttribute("foo");

Session replicates at the end of the request, even though the session attribute is immutable.

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Create session attribute containing an unmodifiable collection of immutable objects. e.g. HttpSession.setAttribute("foo", Collection.singleton("bar")); On subsequent request, lookup attribute created above. e.g. HttpSession.getAttribute("foo"); Session replicates at the end of the request, even though the session attribute is immutable.

Unmodifiable collections include:
Collections.empty*();
Collections.singleton*();
Collections.unmodifiable*();

where the collection contents are also immutable.

is cloned by

WFLY-7801 HttpSession attributes containing unmodifiable collections of immutable objects trigger unnecessary replication