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Date: Wed, 9 Mar 2011 09:36:59 +0000 (UTC)
From: "Uwe Schindler (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] Resolved: (LUCENE-2953) PriorityQueue is inheriently broken
 if subclass attempts to use "heap" w/generic T bound to anything other then
 "Object"
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     [ https://issues.apache.org/jira/browse/LUCENE-2953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uwe Schindler resolved LUCENE-2953.
-----------------------------------

       Resolution: Fixed
    Lucene Fields: [New, Patch Available]  (was: [New])

Committed 3.x revision: 1079711 (only private heap and getter, initialize unchanged for backwards compatibility).

If we want to backport also the initialize() changes to 3.x (as PQ is a @lucene.internal class), we should reopen this issue.

> 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
>            Assignee: Uwe Schindler
>             Fix For: 3.2, 4.0
>
>         Attachments: BenchmarkArrayAccess.java, LUCENE-2953.patch, 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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