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https://issues.apache.org/jira/browse/LUCENE-1636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12709375#action_12709375
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Uwe Schindler commented on LUCENE-1636:
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What do you want to do with an filter without a delegate? Calling next() would
simply NPE, too!
> TokenFilters with a null value in the constructor fail
> ------------------------------------------------------
>
> Key: LUCENE-1636
> URL: https://issues.apache.org/jira/browse/LUCENE-1636
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 2.9
> Reporter: Wouter Heijke
> Attachments: LUCENE-1636.patch
>
>
> While migrating from 2.4.x to 2.9-dev I found a lot of failing unittests.
> One problem is with TokenFilters that do a super(null) in the constructor.
> I fixed it by changing the constructor to super(new EmptyTokenStream())
> This will cause problems and frustration to others while migrating to 2.9.
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