jpa/subsystem/src/main/java/org/jboss/as/jpa/container/SFSBCallStack.java
public static Map<String, ExtendedEntityManager> popCall() {
        ArrayList<Map<String, ExtendedEntityManager>> stack = currentSFSBCallStack();
        Map<String, ExtendedEntityManager> result = stack.remove(stack.size() - 1);
        stack.trimToSize();
        return result;
    }
public static Map<String, ExtendedEntityManager> popCall() {
        ArrayList<Map<String, ExtendedEntityManager>> stack = currentSFSBCallStack();
        Map<String, ExtendedEntityManager> result = stack.remove(stack.size() - 1);
        stack.trimToSize();
        return result;
    }
Pops the current SFSB invocation off the invocation call stack

@return the entity manager map