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https://issues.apache.org/jira/browse/LUCENE-1636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711933#action_12711933
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Wouter Heijke commented on LUCENE-1636:
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I'm on holiday now, but as far as I recollect (as I was not the author of the
code) it was done on some filters that would be used in another situation
(similar to a filter) to use the filter's functionality. Also it was used with
filters that could not be extended, so a new filter was created, also here the
orignal filter's public methods would be called.
In a way it doesn't matter, it could be done with the api without any problems
with the latest few releases that i know of.
A more elegant way if one would like to introduce this new behaviour is to at
least log some kind of error message in the 2.9 release so users would be
alarmed that they use the Lucene api in a way that is not supported anymore.
> 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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