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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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