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https://issues.apache.org/jira/browse/JDO-598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608631#action_12608631
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Craig Russell commented on JDO-598:
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I think that an implementation of compareTo that always returns zero would
effectively disallow the class from being used for keys of Map or entries of
Collection. The second entry would compare equal with the first entry and be
disallowed. This might be confusing to the user.
I think better would be to throw an exception if the key instance did not
implement Comparable. This would allow the known good cases to work correctly
and give a reasonable error message ("The key class Foo does not implement
Comparable").
> Make SingleFieldIdentity classes implement Comparable
> -----------------------------------------------------
>
> Key: JDO-598
> URL: https://issues.apache.org/jira/browse/JDO-598
> Project: JDO
> Issue Type: Improvement
> Components: api2
> Reporter: Andy Jefferson
> Fix For: JDO 2 maintenance release 2
>
> Attachments: SingleFieldIdentity_Comparable.patch
>
>
> Would be preferable for javax.jdo.identity classes to implement Comparable so
> that we can store them in a TreeSet etc
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