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https://issues.apache.org/jira/browse/XERCESJ-1751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17605519#comment-17605519
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Michael Glavassevich commented on XERCESJ-1751:
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There were some improvements made for special cases, but in general large
maxOccurs can cause an OOM and is a known limitation, tracked by this issue in
JIRA issue: https://issues.apache.org/jira/browse/XERCESJ-1227. Your choices to
work around this are to use maxOccurs="unbounded" or use the JAXP secure
processing feature / Xerces SecurityManager to block XML Schemas that would
result in an OOM. Using the assertion feature from XML Schema 1.1 may also
perform better.
> Changing maxOccurs=unbounded to some finite number throws OOM in JVM
> --------------------------------------------------------------------
>
> Key: XERCESJ-1751
> URL: https://issues.apache.org/jira/browse/XERCESJ-1751
> Project: Xerces2-J
> Issue Type: Bug
> Affects Versions: 2.12.2
> Environment: Linux
> Reporter: Partha Pratim Paul
> Priority: Major
>
> Changing maxOccurs=unbounded to some finite number throws OOM in JVM. The
> finite number we have used is from 1000 to 5500 but the creates a memory
> starvation or resource exhaustion in all JVMs processing XMLs.
> The ask to let us know if -
> # Is there any boundary value that we can use for maxOccurs in our schema to
> overcome this issue?
> # Is there any fix available in the latest Xerces versions that we can
> upgrade to and that does not create this OOM exception? Our current version
> is 2.12.2
> # Is there any setting in the JVM (like Heap/Memory) that you recommend for
> us to use? The current heap size is 6GB for our JVMs
> # Is there any attribute that can be added to the schema to fix this issue
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