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https://issues.apache.org/jira/browse/LUCENE-2953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003876#comment-13003876
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Uwe Schindler commented on LUCENE-2953:
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bq. Or a protected getter method that would do the cast (why bother with having
two fields)
Good idea, I am currently fixing the whole stuff (I was the one who added the
generics in Lucene 3.0). But I am now also removing initialize(int), this
construct is very broken. In trunk we can break backwards for this.
> PriorityQueue is inheriently broken if subclass attempts to use "heap"
> w/generic T bound to anything other then "Object"
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2953
> URL: https://issues.apache.org/jira/browse/LUCENE-2953
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Hoss Man
> Attachments: BenchmarkArrayAccess.java, LUCENE-2953.patch
>
>
> as discovered in SOLR-2410 the fact that the protected "heap" variable in
> PriorityQueue is initialized using an Object[] makes it impossible for
> subclasses of PriorityQueue to exist and access the "heap" array unless they
> bind the generic to Object.
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