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https://issues.apache.org/jira/browse/LUCENE-1998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768118#action_12768118
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Uwe Schindler commented on LUCENE-1998:
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I tested it here, we have no backwards problem (at least with "normal" usage).
The dynamic linker of Java when running old Java 1.4 code against the new enum
classes has no problem with the replaced superclass: Old code compiled against
Field.Store.XXX against lucene-core-2.9.jar with superclass Parameter works
perfectly with the new lucene-core-3.0.jar. This works because we only use the
parameter class as a type safe enumeration an did not call any methods (only
maybe toString()) of it. So the linker has no problem.
I would simply apply this ptach to trunk. I would also remove the Parameter
class completely, as it breaks no code (only if somebody has used that class
for own enums). Maybe we should deprecate Parameter in 2.9.1 and say that it
will be removed in 3.0 as this version uses Java5's enum. But it also does not
hurt if we keep it and mark it deprecated as in the patch.
To your patch: I only added the license header back in the Version class. It
must be there.
> Use Java 5 enums
> ----------------
>
> Key: LUCENE-1998
> URL: https://issues.apache.org/jira/browse/LUCENE-1998
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 3.0
> Reporter: DM Smith
> Priority: Minor
> Fix For: 3.0
>
> Attachments: LUCENE-1998_enum.patch
>
>
> Replace the use of o.a.l.util.Parameter with Java 5 enums, deprecating
> Parameter.
> Replace other custom enum patterns with Java 5 enums.
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