The Liberty server cannot load web modules where the web.xml deployment descriptor has a namespace value that does not match the defined version. Web modules at version 2.4 must use the http://java.sun.com/xml/ns/j2ee namespace. Web modules at version 2.5 or 3.0 must use the http://java.sun.com/xml/ns/java namespace. Web modules at version 3.1 or later must use the http://xmlns.jcp.org/xml/ns/javaee namespace.