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https://issues.apache.org/jira/browse/LUCENE-1529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699012#action_12699012
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Michael Busch commented on LUCENE-1529:
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Good catch! Thanks for fixing this, Shai and Mike!
> back-compat tests ("ant test-tag") should test JAR drop-in-ability
> ------------------------------------------------------------------
>
> Key: LUCENE-1529
> URL: https://issues.apache.org/jira/browse/LUCENE-1529
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Build
> Affects Versions: 2.9
> Reporter: Michael McCandless
> Assignee: Michael Busch
> Priority: Minor
> Fix For: 2.9
>
> Attachments: lucene-1529.patch
>
>
> We now test back-compat with "ant test-tag", which is very useful for
> catching breaks in back compat before committing.
> However, that currently checks out "src/test" sources and then
> compiles them against the trunk JAR, and runs the tests. Whereas our
> back compat policy:
> http://wiki.apache.org/lucene-java/BackwardsCompatibility
> states that no recompilation is required on upgrading to a new JAR.
> Ie you should be able to drop in the new JAR in place of your old one
> and things should work fine.
> So... we should fix "ant test-tag" to:
> * Do full checkout of core sources & tests from the back-compat-tag
> * Compile the JAR from the back-compat sources
> * Compile the tests against that back-compat JAR
> * Swap in the trunk JAR
> * Run the tests
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