Absolutely! XML support is all over J2EE.
J2EE 1.4 includes support for JAXP, JAX-RPC,
SOAP, JAXR(XML Registries) all of which rely on the XML technology. J2EE1.4 comes bundled with Sun's XML parser Crimson, the default choice for XML parser and Apache's Xalan, the default choice for XSLT transformation engine.