yes, it can. From your code, you can call the 'PDF Object' (both in the ABAP and the Java world, there is one for each) directly to execute the appropriate actions on the PDF form.
However, Web Dynpro provides a number of capabilities 'out of the box' (I hate this expression...), for example, the return of data entered into a form to the system via the WD context.
yes, you can do what you would like to do with standard Java procedures. As they are standard Java procedures, they are not documented anywhere with a specific reference to Interactive Forms.
The PDFObject is a documented Java method you can call from your Java code, and thus tell the ADS what you want to do with the PDF.
The JavaDoc for the PDFObject is in the documentation of the Developer Studio and in SDN on the JavaDoc page. It is a Web Dynpro method.
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