Summary: OXF + Struts on JBoss

[Julien Mercay]

For public record, here is the summary of a question I have been asked 
recently.

Problem:

The OXF/Struts example shipped with OXF 1.5.1 does not work on JBoss 
3.0.6 + Tomcat 4.1.18. The following exception is thrown:

java.lang.NoSuchMethodError:
    org.exolab.castor.xml.Marshaller.(Lorg/xml/sax/ContentHandler;)V
Solution:

This error comes from a class conflict between the castor.jar (the bean 
marshaller) we are shipping with OXF and an older one bundled in JBoss.

JBoss, per default, follows the Java 2 delegation model, which
specifies that classes from the webapp have a lower priority than the
system classes. This is contrary to the Servlet 2.3 specification
(section 9.7.2) which says the webapp classes should be loaded
first (with the exception of the J2SE classes).
Fortunately, there is a way to change that behavior. Edit the
server/default/deploy/tomcat41-service.xml file in your JBoss
directory. Under the <mbean> element, add a new <attribute> :
     <attribute name="Java2ClassLoadingCompliance">false</attribute>

If the modification is successful, you should see a line like the
following next time you start JBoss:
12:24:00,072 INFO  [EmbeddedCatalinaService41] Using Java2 parent
classloader delegation: false
Julien