The JarDeployer refuses to add jars to the classpath if there is a META-INF/.xml pattern seen. This is overly restrictive as it excludes jars like the myfaces jar which includes a META-INF/faces-config.xml. If the JarDeployer had a descriptor list attribute which defines the list of META-INF/.xml names that should cause the JarDeployer to ignore the jar rather than ignoring all jars with META-INF/*.xml files this would simplify use of existing jar packages.