Sun Java System Web Server 6.1 supports Java 2 Platform, Standard Edition (J2SE) 1.5, and has been certified with the following JDK versions:
Solaris (SPARC, x86, and AMD64): 1.5.0_11
Linux: 1.5.0_11
Windows: 1.5.0_11
HP-UX: 1.5.0.04
AIX: 1.5.0 20071025a (SR6b)