Is it the existing system the "bad" kind of Java (J2EE 1.4/EJB 1/xml hell/Abstract Factory madness) or the nicer and more modern RESTy/Dependency Injected/JEE6

Is it the existing system the "bad" kind of Java (J2EE 1.4/EJB 1/xml hell/Abstract Factory madness) or the nicer and more modern RESTy/Dependency Injected/JEE6 (or Spring) variant? And I recall that one of the trickier requirements is correctly sending and acking enrollment info (EDI?) to and from the many (dozens?) of insurance companies involved. Is that piece looking ok?