Certain versions of openjdk contains a broken version of apache xmlsec which causes signatures to fail on xml documents with more than 23 namespace declarations:
- http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6696582
- https://issues.apache.org/bugzilla/show_bug.cgi?id=38655
If you run into this problem you will get an ArrayIndexOutOfBoundsException when you try to reference certain entities through the MDX interface.
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