Automated build of J2EE app using Ant for WebSphere 4

[Val . Danukarjanto]

I have started to use Ant, and have been able to run simple tasks.
Now I am faced with a big task to automate code-generation -> build -> 
deploy process involving the whole thing, Java code, EJBs, Servlets into 
WebSphere 4.0.3. 
Any help, pointers, examples, especially a sample (or samples of) 
build.xml (s) to build the key parts (EJBs, etc.), will be much 
appreciated.
Best regards,
Val.