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From "Timo Boehme (JIRA)" <...@uima.apache.org>
Subject [jira] [Created] (UIMA-6064) External DTD usage in XML descriptors disabled during build revision upgrade
Date Wed, 12 Jun 2019 10:04:00 GMT
Timo Boehme created UIMA-6064:

             Summary: External DTD usage in XML descriptors disabled during build revision
                 Key: UIMA-6064
                 URL: https://issues.apache.org/jira/browse/UIMA-6064
             Project: UIMA
          Issue Type: Bug
          Components: Core Java Framework
    Affects Versions: 2.10.2SDK
            Reporter: Timo Boehme

Between version 2.10.1 and 2.10.2 the XMLParser configuration was changed (fixed, without
the possibility to adjust it) to not allow for DTD and its loading from external file.

This is done in XMLUtils.createSAXParserFactory() which sets the DISALLOW_DOCTYPE_DECL and
LOAD_EXTERNAL_DTD feature. Before the SAXParserFactory was created without adjusting these

While I understand that this was done to prevent malicious XML from doing nasty things, the
kind how it was done is problematic:
 * the change happened in a revision build, no major or minor number change
 * it was not documented
 * one cannot simply change it back like using an environment variable, method call etc. -
the only workaround is to do a problematic sub-classing of XMLParser_impl with additional
configuration etc.

We use the DTDs for CPE descriptors white a lot to have the descriptor in modular chunks using
entities etc. Thus it is quite important (for the time being) to use DTD there - and we know
that the XML is not problematic.

Because this feature (DTD) is crucial I have marked this as a BUG since such changes should
not occur in a build upgrade or it should at least be possible to get the old behavior easily


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