Use a jar with source as source for jdb?

Question

I have a executable jar with source compiled in and I want to debug it using jdb (no other debugger available in this environment unfortunately).

I am able to debug it with

jdb -classpath "${JAR_FILE}:${CLASS_PATH}" ${MAIN_CLASS} ${ARGS}

How can I get jdb to use the source that is built into the jar file?

Notes: Java 6, AIX, ksh

score 8 · Answer 1 · answered Nov 12 '10 at 15:26

If jdb is ignoring *.jar and *.zip entries for sourcepath, maybe you can whip up a batchfile to expand the source from the target jar into a temp directory and point sourcepath to that.

Something like this

MYDEBUGDIR=/temp/source/mydebug
jar -xf target.jar -C $MYDEBUGDIR
jdb -sourcepath ${MYDEBUGDIR} -classpath "${JAR_FILE}:${CLASS_PATH}" ${MAIN_CLASS} ${ARGS}
rmdir -r $MYDEBUGDIR

That way the debug source is in sync with the jar and it cleans up after itself.

score 5 · Accepted Answer · answered Sep 08 '10 at 16:53

5

It may not be possible, as stated in this (very old) post on the forums.

answered Sep 08 '10 at 16:53

C. Ross

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Nice. Source code for jdb appears to explicitly ignore *.jar and *.zip entries for `sourcepath`. – kschneid Sep 08 '10 at 20:19
@kschneid, Thanks for checking. Stick around, we need more like you. – C. Ross Sep 08 '10 at 20:59
@kschneid Now that Oracle has taken over Sun, I'm having difficulty locating a link for the jdb source code :-(, but I'll take you at your word. Lame. – Ogre Psalm33 Oct 13 '11 at 20:07
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And apparently Oracle saw fit to purge their very old forum posts. Link is now broken. :'( – Ogre Psalm33 Oct 13 '11 at 20:14

LIU YUE · Answer 3 · 2019-10-29T10:38:21.733

actually I managed to debug into a jar file without source code today, the steps are as follows:

unzip jar file
jdb -sourcepath [unzipped source folder] -classpath [the path for your main class]
after jdb initializing, excute:

stop at <package>.<yourclass>:<linenunmber>
run <your main class, for example org.springframework.boot.loader.JarLauncher>

after breakpoint triggered, you can step by step debug using jdb command

score 0 · Answer 4 · answered Sep 08 '10 at 14:41

0

Haven't tried this personally, but perhaps the sourcepath option will allow JAR files: jdb -sourcepath ${JAR_FILE} ...

answered Sep 08 '10 at 14:41

kschneid

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Use a jar with source as source for jdb?

4 Answers4