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https://issues.apache.org/jira/browse/JCR-1251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549493
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Christoph Kiehl commented on JCR-1251:
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Well spotted! I observed another gain of about 7% on my machine with about 
100.000 documents using your patch. So definitely +1

> DescendantSelfAxisQuery creates too many object instances
> ---------------------------------------------------------
>
>                 Key: JCR-1251
>                 URL: https://issues.apache.org/jira/browse/JCR-1251
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: jackrabbit-core, query
>            Reporter: Christoph Kiehl
>            Assignee: Christoph Kiehl
>            Priority: Minor
>             Fix For: 1.4
>
>         Attachments: DescendantSelfAxisQuery-patch.txt, JCR-1251.patch
>
>
> In DescendantSelfAxisQuery.DescendantSelfAxisScorer.isValid() there is an 
> ArrayList and an Integer instance created on every call. Since this method 
> gets called really often during queries the object creation/gc affects 
> performance.

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