I have some information about using Java on most of the HP machines in the CS department that may be useful to people that haven't used Java before:
On the SWW, there are two versions of Java installed for HPUX: Java 1.0 and Java 1.0.2. Java 1.0.2, which is the default, requires HPUX 10, which is not installed on most machines. If you try to run Java 1.0.2 on a machine which doesn't support it, you get an error message like
 % java crt0: ERROR couldn't open /usr/lib/dld.sl errno:000000002
To use the right version of Java, add
to the front of your path.