Java EE (Java Enterprise Edition) General Discussion

I need to develop Webservice Application for our Client .

I dont know anything about WSDL4J

Hi from the net i found this


"The Web Services Description Language for Java Toolkit (WSDL4J) allows the creation, representation, and manipulation of WSDL documents.
Is the reference implementation for JSR110 'JWSDL' (jcp.org)."


But anybody please tell me why should we use WSDL for developing webservices ??
Is there any specific advantage we will get ??

And Can body please point me a link where to start for working with WSDL4j ?

Thank you very much