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Date: Wed, 18 Sep 2013 09:54:13 -0400
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Subject: Route HANGS processing XML with external DOCTYPE declaration
From: Dale King <dalewking@gmail.com>
To: users@camel.apache.org
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I've used xpath routes previously and had no problem. I tried doing a split
with xpath on an XHTML document however and the route just hangs. It
doesn't throw an exception or simply fail to find a match for the XPath, it
just hangs.

After 4-5 hours of debugging the issue, I have discovered it is because the
XHTML contains an external DTD declaration (a DOCTYPE) as it should. When
converting the XML content to a DOM it tries to load the external DTD which
never completes, causing the route to hang.

The solution I have found is to add the following class and declare it as a
bean in the Spring configuration and Spring will autowire it into the
XmlConverter, but I would be interested in knowing anything better to avoid
the lockup:

@SuppressWarnings("restriction")
public class NoExternalDtdDocumentBuilderFactory extends
DocumentBuilderFactoryImpl
 {
    public NoExternalDtdDocumentBuilderFactory() throws
ParserConfigurationException
    {
        setValidating(false);
        setNamespaceAware(true);
        setFeature("http://xml.org/sax/features/namespaces", false);
        setFeature("http://xml.org/sax/features/validation", false);
        setFeature("
http://apache.org/xml/features/nonvalidating/load-dtd-grammar", false);
        setFeature("
http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
    }
}


-- 
Dale King

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