15 September 2015

WebLogic Server XML Parsers

Many times there are question in WebLogic Server about parser factories:

java.lang.AbstractMethodError: javax.xml.parsers.DocumentBuilderFactory.setFeature

  java.lang.ClassCastException: weblogic.xml.jaxp.RegistryXMLInputFactory cannot be cast to javax.xml.stream.XMLInputFactory
    Error weblogic.xml.jaxp.RegistryXMLInputFactory cannot be cast to javax.xml.stream.XMLInputFactory

 java.lang.NoSuchMethodError: javax.xml.parsers.DocumentBuilderFactory.newInstance(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljavax/xml/parsers/DocumentBuilderFactory;




Because the classpath retrieve from different parts these implemenations, including the JDK6 which bundles in it now.

This is how you can change by system properties the implementation, using xerces:

-Djavax.xml.parsers.SAXParserFactory=org.apache.xerces.jaxp.SAXParserFactoryImpl -Djavax.xml.parsers.DocumentBuilderFactory=org.apache.xerces.jaxp.DocumentBuilderFactoryImpl -Djavax.xml.parsers.SAXParser=org.apache.xerces.jaxp.SAXParserImpl

maybe you'll need to add xercesImpl.jar to your classpath. 



More info: 
https://docs.oracle.com/cd/E57014_01/wls/WLACH/pagehelp/Corexmlregistryxmlregistryconfigtitle.html



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The views expressed on this blog are my own and do not necessarily reflect the views of Oracle.