[Java-gnome-developer] Debugging Java/JNI applications

[Mariot C. <mar...@gm...>]

Hi all,

I am a student who takes part this year to the google summer of code for the
Eclipse project (My mentors are Philippe Ombredanne and Francois Granade).
The purpose of my project is to provide seamless debugging of Java/Jni
applications in Eclipse. Since April I am working to improve the "user
experience" for developers who work on java projects using JNI and native
code.

A version 0.0.2 is available to download. Concretely this version adds an
entry in the Debug dialog, which allow you to launch a JNI debug session.
After creating a new configuration with the correct settings, if you launch
it, the JVM will be launched and gdb attached to its pid and the two targets
will be displayed.

Then you can follow the call of native functions into native code. For
instance, regarding this Java line :

new JNITest().native_doubleInt(42);

If you choose to step into, then you will go into native code :

JNIEXPORT jint JNICALL Java_JNITest_native_1doubleInt (JNIEnv *pEnv,
jobject  obj, jint  value) {

If you choose to step over, or step return, you will simply go on the next
Java code line.

The same behavior is available to follow java call from native code. For
instance regarding this C line :

(*pEnv)->CallVoidMethod(pEnv,obj,mid);

If you choose to step into, then you will go into the java method. Otherwise
if you choose to step over, or step return, you will simply go on the next
native code line.

More technical infos can be found on my blog :
http://eclipse-soc-mariot.blogspot.com
Some structured documentation is available on the following wiki page :
http://wiki.eclipse.org/index.php/Support_seamless_debugging
_between_JDT_and_CDT

To install it an update site is available :
http://eclipse-incub.svn.sourceforge.net/viewvc/*checkout*/eclipse-incub/jni_seamless_debugging/update-site/site.xml


I that you use JNI, so I am think this functionnality could help us in your
work. I will appreciate any feedback/comments that will help me to improve
this plug-in.

You will surely find a lot of bugs/problems, please report them on the
eclipse bugzilla. There is a " org.eclipse.soc.jni" component in SOC which
is in Technology category (please add me in CC).

Regards,

Mariot
-- 
Mariot Chauvin