Java SE (Java Platform, Standard Edition)

Hi everybody,

I wonder if this is the right forum for this purpose, but hope that you could help me!
I am in charge to find a way how to developp a modular application using Java so each "module" can stand alone as good as it can operate with the others
if there is a kind of technique way to do so with Java please I am all ears for your Guidance (books, urls, examples ...)

Thanks in adavance!