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https://issues.apache.org/jira/browse/LUCENE-1636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762387#action_12762387
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Uwe Schindler commented on LUCENE-1636:
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This change is also noted in the backwards compatibility section of Lucene 2.9.
The assignment of filter in the ctor is totally useless, as the super ctor does
it already, so it the problem of this third party software that used the API in
an undocumented way. I am sorry for your problems, but the author of lucene-ja
should provide a fix, if you have the source code available, it is a less
important problem, if it is closed source, you have to ask the author to fix it
soon.
> 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
> Assignee: Michael McCandless
> Fix For: 2.9
>
> 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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