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https://issues.apache.org/jira/browse/XERCESJ-1687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16324194#comment-16324194
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Stephan Trebels commented on XERCESJ-1687:
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Validator must be used on one thread, only. Schema is thread safe, in
principle. So, a created schema can be used by as many validators as wanted,
once it is created. SchemaFactory - unless I misremember my test - is only
used to create the schema once, and then you merely create validators.
>From my debugging sessions, it does not even matter if you use separate schema
>factories, schemas, and validators, as the issue is deep inside Eclipse XPath.
Either way, I did get legal permission to submit the patch to Eclipse, it just
is a bit harder to get to build properly than Xerces ;-)
> XSD 1.1 validation with xs:assert is not thread safe
> ----------------------------------------------------
>
> Key: XERCESJ-1687
> URL: https://issues.apache.org/jira/browse/XERCESJ-1687
> Project: Xerces2-J
> Issue Type: Bug
> Components: JAXP (javax.xml.validation)
> Environment: java 8 / java 9
> Reporter: Stephan Trebels
> Priority: Critical
> Attachments: parallel-test.zip
>
>
> The XSD 1.1 validation code uses eclipse webtools xpath to validate
> assertions. The PsychoPath XPath 2.0 engine has a bug in
> ResultSequenceFactory, which invalidates correct execution in all parallel
> invocation of XSD 1.1 validation.
> This issue affects completely unrelated schemas and input XML, as long as
> both use assertions. The effect is a lot of spurious assert violations. The
> issue is visible even if only two threads are used in parallel.
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=527812
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