Harden JAXB XML unmarshalling against XXE explicitly#1311
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Parse holiday XML through an XMLInputFactory with SUPPORT_DTD and IS_SUPPORTING_EXTERNAL_ENTITIES disabled instead of unmarshalling the raw InputStream directly. Previously the absence of DTD/external-entity processing relied entirely on the defaults of whichever StAX/JAXB provider was on the classpath, which would silently disappear if a consumer swapped or downgraded that provider. Add a regression test asserting that XML containing a DOCTYPE declaration is rejected. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Parse holiday XML through an XMLInputFactory with SUPPORT_DTD and IS_SUPPORTING_EXTERNAL_ENTITIES disabled instead of unmarshalling the raw InputStream directly. Previously the absence of DTD/external-entity processing relied entirely on the defaults of whichever StAX/JAXB provider was on the classpath, which would silently disappear if a consumer swapped or downgraded that provider.
Add a regression test asserting that XML containing a DOCTYPE declaration is rejected.