Sun Java System Web Server 6.1 supports Java 2 Platform, Standard Edition (J2SE) 1.6, and has been certified with the following JDK versions:
Solaris (SPARC, x86, and AMD64): 1.6.0_03
Linux: 1.6.0_03
Windows: 1.6.0_03
HP-UX: 1.6.0.00
AIX: 1.6.0 20071123_01