Here is a list of tested versions or reported as working by users, before reporting a problem please make sure that you are using a compatible versions.
If you successfully installed JBoss portal on versions not listed here please let us know so we can add it here.
This is really important that you only use the JBoss version supported, for now we only support JBoss 4.0.0
MySQL is the database used for our testings, 4.0.22 is one version that has been fully tested. There is no reason why any other MySQL database would not work so give it a try.