I work on an application released on jboss 4.2.3GA + jdk 1.6

I need to upgrade jdk at least to 1.7, is it possible to do it with the same jboss version ?

Is it possible to use jBoss 4.2.3GA with jdk 1.7 ?

I know it is better to migrate to jBoss 5.1, but it is possibile continue to work with jboss 4.2.3GA + jdk 1.7 ?

Witch modification to jboss I have to do if it possible to work with the same ?

Regards

Vittorio