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https://issues.apache.org/jira/browse/XERCESJ-1684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16268853#comment-16268853
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Stephan Trebels commented on XERCESJ-1684:
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Please note, that the sitation is worse. This is not just about memory being
retained, as the DefaultRSFactory retains references, this also makes the whole
usage of XPath 2.0 non-thread safe. Two validations using xs:assert in
different XSD schemas of two different XML files cannot execute in parallel.
https://bugs.eclipse.org/bugs/show_bug.cgi?id=527812
A fix is proposed, replacing the pooling DefaultRSFactory with a
SimpleRSFactory, which would also remove the memory reference kept. This truly
makes the usage of the old unpatched XPath a critical issue, as it is not
possible to run any validations in parallel. Let's re-open this, and not wait.
> Very high memory usage validating XSD 1.1 (+memory leak)
> --------------------------------------------------------
>
> Key: XERCESJ-1684
> URL: https://issues.apache.org/jira/browse/XERCESJ-1684
> Project: Xerces2-J
> Issue Type: Bug
> Components: JAXP (javax.xml.validation)
> Environment: windows java 1.8
> Reporter: Simon Sprott
> Priority: Critical
> Fix For: 2.12.0
>
> Attachments: SAFTPT_1_04_01_XSD11_Full.zip, tmp.zip
>
>
> using the 1.1 code branch built from
> http://svn.apache.org/repos/asf/xerces/java/branches/xml-schema-1.1-dev
> Using the built in sample validator
> java jaxp.SourceValidator -xsd11 -a "SAFTPT_1_04_01_XSD11_Full.xsd" -i
> "tmp.xml"
> The validation consumes huge amounts of memory (breaks at 10 GB on my
> system), on smaller sample files validation does complete, but still consumes
> a very large quantity of memory.
> Furthermore it seems to retain the memory allocated via a reference in
> org.eclipse.wst.xml.xpath2.processor.internal.DefaultRSFactory._factory after
> the validator has completed (this is not evident in the cmd line sample as
> the process ends, but I have observed in in my own code).
> If I was to guess I would say that the results of the XPath queries are being
> cached via DefaultRSFactory and never released.
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