Any host on which you intend to deploy the Sun Java Enterprise System Application Server plug-in must meet the following requirements:
The Sun Java Enterprise System Application Server plug-in runs on the following operating systems:
Solaris 8 for SPARC
Solaris 9 for SPARC
Solaris 10 for SPARC
Solaris 9 for x86
Solaris 10 for x86
Redhat Enterprise Linux 2.1 Update 2
Redhat Enterprise Linux 3.0 Update 1
On Solaris you must have at least 250 MB of free disk space (500 MB recommended). On Redhat Enterprise Linux you must have at least 220 MB of free disk space (300 MB recommended).
512 MB minimum; 1 GB recommended
J2SE 1.4.2_06 or J2SE 5.0