eap 5.1 to eap 7.0 migration question

Our current web applications in JBoss EAP 5.1, there are following frameworks involved in: Hibernate 3.3.0, Spring 3.0.5.RELEASE and Icefaces 1.8, database is Oracle 11g. When migrating to EAP 7.0, we'd like to keep the existing configurations and codes, or minimize the change as much as possible, my question here is "is it feasible to keep the most without changing? We are facing a lot of issues, such as missing dependencies or ClassNotFound during our migration exercises, we googled but can't find good solutions.

Any suggestions on if we need to update frameworks in JBoss EAP7? If required, which versions?

Thanks in advance.