solr-tomcat5.5: Solr app does not start: Exception starting filter SolrRequestFilter

Debugging apache-solr-1.2.0.jar, using tomcat 5.5 running on java 5, I found the problem comes from another hidden exception:
Caused by: java.lang.RuntimeException: XPathFactory#newInstance() failed to create an XPathFactory for the default object model...

Two solutions:

• Remove $TOMCAT_HOME/common/endorsed/xml-apis.jar (I mean mv xml-apis.jar xml-apis.jar.removed). So, the runtime libraries of java 5 will be used, not the tomcat endorsed.

Or:

• Add missing libraries (xalan.jar and serializer.jar) into $TOMCAT_HOME/common/endorsed/. I've got those libraries in xalan-j_2_7_0-bin-2jars.zip you can download from http://www.apache.org/dyn/closer.cgi/xml/xalan-j

Then, restart tomcat.

Ref del problema:
http://groups.google.com/group/linux.debian.bugs.dist/browse_thread/thread/f551fc6f05c48d17