Subj : Problems debugging shared object code called from Java JNI
To   : comp.os.linux.development,comp.os.linux
From : Exits Funnel
Date : Wed Dec 01 2004 08:28 pm

Hello,

I'm currently working a project which comprises a Java API layer and a 
native C++ piece (which I'll call the driver).  Only the java API is 
exposed to our clients.  Internally, the java makes calls to the C++ 
through JNI.  We port the native stuff to several platforms including 
RedHat linux on which we generate from it a shared object.  I'm trying 
to figure out how to use gdb to debug the driver but having no luck.  I 
want to be able to set a breakpoint in one of the native source files 
and then launch the java process on some java test code which results in 
calls into the shared object - thereby letting me do source level 
debugging in the shared object.  Just to be clear, I'm not trying to 
debug the java code, just the shared object.  I can do this in the 
developer studio on Windows so I'd be surprised if I couldn't do it with 
gdb but I can't figure it out.

I've tried this:

gdb --args java MyTest

run

but gdb complains about 'no debugging symbols found' and also that it 
'Cannot find user-level thread for LWP 4494: generic error.'

Does anyone have any suggestions.  Thanks in advance for any help.

-exits

.