I have a predefined project in Eclipse that is empty, with the exception of a utility that parses the JNLP file and loads all the banks specified in the jnlp code base. If you wish, you can replace any banks with an updated code that you want to check here. It uses reflection to add all the banks to the class path (which is a hack), and then reflexively calls the main class method specified as the main class in JNLP, with any arguments.
Unfortunately, I cannot share the source for this, but it took me only one day to launch it.
Access to the hack class is available here: How can I load Jars dynamically at runtime?
Works well with any debugging.
S. fitch
source share