Question

I am using Jboss5 and I’m trying to utilize Hibernate and Spring to load in a spring dao. I’m getting an exception which seems to point to an incompatibility in jars but I’m not quite sure what is going on. I’ve done quite a bit of searching and I can’t seem to find something specific to this besides change JBOSS versions. I am wanting to know if anyone has had any similar issues or found a way to get around this. Should I not be including the spring and hibernate jars in my ear?

Unexpected exception parsing XML
document from class path resource
[applicationContext.xml]; nested
exception is java.lang.LinkageError:
loader constraint violation: when
resolving method
“javax.xml.parsers.DocumentBuilder.setEntityResolver(Lorg/xml/sax/EntityResolver;)V”
the class loader (instance of
org/jboss/classloader/spi/base/BaseClassLoader)
of the current class,
org/springframework/beans/factory/xml/DefaultDocumentLoader,
and the class loader (instance of
) for resolved class,
javax/xml/parsers/DocumentBuilder,
have different Class objects for the
type org/xml/sax/EntityResolver used
in the signature

Answer 1

You probably have a copy of one of the XML API JARs in your WAR or EAR, like Xerces, xml-apis, or something like that. This will clash (violently) with JBoss’s own.

Make sure your WAR/EAR has none of its own copies of the javax.xml libraries in its lib directory.