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https://issues.apache.org/jira/browse/LUCENE-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653321#action_12653321
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Michael McCandless commented on LUCENE-1473:
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bq. For classes that no one submits an Externalizable patch for, the
serialVersionUID needs to be added.
The serialVersionUID approach would be too simplistic, because we can't simply
bump it up whenever we make a change since that then breaks back compatibility.
We would have to override write/readObject or write/readExternal, and
serialVersionUID would not be used.
> Implement standard Serialization across Lucene versions
> -------------------------------------------------------
>
> Key: LUCENE-1473
> URL: https://issues.apache.org/jira/browse/LUCENE-1473
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Affects Versions: 2.4
> Reporter: Jason Rutherglen
> Priority: Minor
> Attachments: LUCENE-1473.patch
>
> Original Estimate: 8h
> Remaining Estimate: 8h
>
> To maintain serialization compatibility between Lucene versions,
> serialVersionUID needs to be added to classes that implement
> java.io.Serializable. java.io.Externalizable may be implemented in classes
> for faster performance.
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