Hi Thanks to venkat .. for the Java Object calling solution
.Having known this, My mind thinks of devilish plans to give away most of the Business Logic or complex calculations to Java and receive it in the XSL end and continue with display as usual. Would this kind of Java object invocation lead to any performance issues??

You write "business logic"... combining business logic
and presentation is often considered a bad idea. The
usual suggestion is a pipelined approach: get the data,
apply your business logic, generate an XML which is your
abstract result, use XSLT to generate the representation
you want. It depends, of course, what you mean by
"business logic".