Debugging rpg called from java

Not sure if this is the right list, but...

How do you debug an rpgle called from java?

I'm flying blind here. I've written the RPG web service programs and the
java guy is in another city and we're communicating by email - this is
really all the info have - he's using the rational development tool. he
sent me this:

Toolbox for Java - Open Source Software, JTOpen 7.8, codebase 5770-SS1
V7R1M0.08 built=20130103 @H5
java.home=/QOpenSys/QIBM/ProdData/JavaVM/jdk60/32bit/jre
java.vm.version=2.4 java.version=1.6.0 os.name=OS/400 os.version=V6R1M0

and

Thread[HttpServer : 0,5,main] Wed Sep 11 09:33:33:329 EDT 2013 Invocation
of program failed.
AS400Message (ID: CEE9901 text: Application error. RNX1216 unmonitored by
WS119 at statement 2100000001, instruction
X'0000'.):com.ibm.as400.access.AS400Message@365e365e

he's getting the CEE9901/RNX1216 when he calls, and according to him he
knows he's starting the program.

I know his jobs are running in QHTTPSVR but I can't find a job log with any
errors.

I've searched the archives and the web for any number of combinations of
java/rpg/rational/debug/ etc, but can't find anything that's helping.

I don't need a long answer, just give me the first clue as to where to
look. A link to the right documentation, where to find a job log, or a way
to start debug via a service job or something.... anything....

Thanks!

Rick