Question

Can anyone guide on how to debug a JNI code on Linux using GDB debugger(if possible please suggest other options).

    -My JNI project when running on Linux is leading to a JVM crash.
    -The CPP code has been compiled into .so files.
    -I run the project like  this : *java xyz.jar -commandline_args_to_project*.

I have the Gdb installed but am not getting how we can debug the project using it.
Also do I necessarily need to compile the .cpp files with -g option t debug .so files?

Answer 1

1. Start your java application
2. Look up the pid using top, ps, …
3. Start gdb with this pid
4. Attach your program code
5. Debug as usual using gdb

This blog post explains the whole thing.