Calling Java Stored Procedure

I am experimenting with Java Stored Procedures and I would like to know if we can call Java Stored Procedures from within Java ?

Also, can we pass String datatypes to and from the Java Stored Proc to the calling programs (could be Java, PL/SQL etc.) ?

Can anyone suggest any good research material on Java Stored Proc ?

Thanks !!!

Check out http://otn.oracle.com/sample_code/te...r/hotelJsp.htm for an example. I would think all of the above is possible but can't say for sure as I haven't used them much yet.