ToStringStyle.registry ThreadLocal initialValue should return a Set that
implements reference equality checking instead of object equality
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Key: LANG-544
URL: https://issues.apache.org/jira/browse/LANG-544
Project: Commons Lang
Issue Type: Bug
Affects Versions: 2.4
Reporter: Michael Richards
ToStringStyle.registry ThreadLocal initialValue should return a Set that
implements reference equality checking instead of object equality.
This change would still protect against cyclical object graphs, but also
protect against the following conditions:
* Incorrect implementations of hashCode/equals for any objects in the object
graph
* Unintended side effects of the hashCode/equals methods for any objects in the
object graph
Unfortunately, Java versions prior to 1.6 do not provide a simple built-in
mechanism to create such a Set. This issue is discussed here in detail:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4479578
A possible work-around is to use an IdentityHashMap instead of a Set. This
class is available in Java 1.4 and later.
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