got following msg from roller users email for same question,
gary
> It is possible that Roller 4 will not run on the new Java EE 6 app
> servers because it depends on one specific version of JPA 1.0 (Apache
> OpenJPA 0.9.7) and that version conflicts with the JPA implementation
> there.
>
> I've been testing Roller 5 against Glassfish 3, JBoss 6 and WebSphere
> 8 and hope to have a new Roller 5.0 RC3 build available for wider
> testing at the the end of the holiday break.
>
> - Dave