There is a mismatch in the classes present in both the commons-collections and the commons-beanutils jars in EAP 6.1.1.  This causes warnings of the form:

  JarClassLoader: Warning:
    org/apache/commons/collections/ArrayStack.class in
    lib/commons-beanutils-1.8.3.redhat-3.jar is hidden by
    lib/commons-collections-3.2.1-redhat-2.jar (with different bytecode)

Note, that this problem did not occur in EAP 6.1.0, which had a different version of commons-beanutils:

  commons-beanutils-1.8.3-redhat-2.jar

where the classes match those in commons-collections-3.2.1-redhat-2.jar.