We just need to use Xalan 2.5.2 (for better performances) with our application. If we substitute the xalan.jar (2.4.1 I think) file in $JBOSS_HOME/server/my_instance/lib, we have an error while JBoss is parsing our datasource XML file.
The only solution that we have founded is to put our Xalan-2.5.2.jar in another directory, and to use the "-Xbootclasspath/p:/.../xalan.jar" option with the JVM.
Is there another better solution? Can't JBoss 3.2.1 (or 3.2.3) run with Xalan 2.5.2 ?