[jira] Updated: (LANG-544) ToStringStyle.registry ThreadLocal initialValue should return a Set that implements reference equality checking instead of object equality

["Henri Yandell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LANG-544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Henri Yandell updated LANG-544:
-------------------------------

    Fix Version/s:     (was: 3.0)
                   3.1

Moving to 3.1 as no activity on a patch and I don't have an itch for the builder package. I'd like to see us move to Java 6 in a later 3.x version so might be best implemented then.

> ToStringStyle.registry ThreadLocal initialValue should return a Set that implements reference equality checking instead of object equality
> ------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LANG-544
>                 URL: https://issues.apache.org/jira/browse/LANG-544
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.builder.*
>    Affects Versions: 2.4
>            Reporter: Michael Richards
>             Fix For: 3.1
>
>
> 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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