Server 

JDK 1.5.x or 1.6.x 

64-bit JVM on supported web containers 

Solaris virtual memory requirements. For Solaris systems, configure at least twice as much virtual memory as the JVM heap size, especially when the JVM is configured in 64–bit mode with over 4 GB for the heap size. Therefore, you might need to increase the operating system swap space.

Client (OpenSSO SDK) 

JDK 1.4.x, 1.5.x. or JDK 1.6.x