Changing from JDK 1.2 to JDK1.3

Hello,
I have JDK1.2, JDK1.3 and JDK 1.4 in my system. By default the version is taken as JDK 1.2.
I need to change this to 1.3. I have tried changing the registry settings which didn't work.
Any suggestions on this would be appriciated
Regards
V123

Maybe my question did not have the correct approach.
I need to develop a web service client which must run on java virtual machine 1.2
I ve tried with axis, glue and jax-rpc but all they need the java.lang.reflect.InvocationHandler interface available since jdk1.3
So the question is: What can I use to write that client without that interface?

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