A couple of people pinged me to ask if it was possible to do a "Step-into" from a Java class into a PL/SQL stored procedure while debugging.
The answer is yes if you are using JDeveloper.
The trick is to use two debug sessions - one to remote debug the PL/SQL and the other to debug the Java file.
Here is a little demo and explanation of the setup to get this working.
(you might want to press F11 while watching to get see the full screen).
Update - the original video got removed - so this one might help = //cdn.app.compendium.com/uploads/user/e7c690e8-6ff9-102a-ac6d-e4aebca50425/f4a5b21d-66fa-4885-92bf-c4e81c06d916/File/4eaa7897cf9c184210259d7f065f9e4e/plsql_debug.html