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https://issues.apache.org/jira/browse/LUCENE-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653869#action_12653869
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Doug Cutting commented on LUCENE-1473:
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> How to write a unit test for multiple versions?
We can save, in files, serialized instances of each query type from the oldest
release we intend to support. Then read each of thes queries and check that it
s equal to a current query that's meant to be equivalent (ssuming all queries
implement equals well). Something similar would need to be done for each class
that is meant to be transmitted cross-version.
This tests that older queries may be processed by newer code. It does not test
that newer queries can be processed by older code. Documentation is a big part
of this effort, that should be completed first. What guarantees to we intend
to provide? Once we've documented these, then we can begin writing tests. For
example, we may only guarantee that older queries work with newer code, and
that newer hits work with older code. To test that we'd need to have an old
jar around that we could test against. This will be a trickier test to
configure.
> 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, 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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