remote debugging a jnlp application with eclipse

java eclipse debugging jnlp
Jill picture Jill · Nov 3, 2009 · Viewed 9.9k times · Source

I'm debugging a jnlp application, and I used to be able to remote debug it through eclipse, but not anymore.

the command to start it is:

 /usr/java/jdk1.6.0_14/jre/bin/java -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=1445 -Djnlpx.heapsize=64m,512m -DtrustProxy=true -Xverify:remote -Djava.security.policy=/lib/security/javaws.policy -Dfile.encoding=UTF-8 -Xbootclasspath/a:/usr/java/jdk1.6.0_14/jre/lib/deploy.jar:/usr/java/jdk1.6.0_14/jre/lib/javaws.jar:/usr/java/jdk1.6.0_14/jre/lib/plugin.jar -classpath /usr/java/jdk1.6.0_14/jre/lib/deploy.jar com.sun.javaws.Main launch.jnlp
Listening for transport dt_socket at address: 1445

and the problem is that when I attach the eclipse debugger, it shuts down and restarts; so the debugger attaches to the first process; and when that dies so does the debugger.

the debugger script actually doesn't matter; as the jnlp process re-starts on its own before the debugger ever gets launched if suspend=n .

I've tried tracing it, but the option -XX:TraceSupport=true (and other variations I have tried) causes a jvm error.

I'm using fedora 11, Eclipse Java EE IDE for Web Developers. (Build id: 20090621-0832)

I'm asking if anyone knows how to fix this, or at least how to turn on better logging (ie, capture all the console output to a log; so that I can take a look at the first console that flashes up on my screen for a millisecond)

thanks!

Answer

Andrew Niefer picture Andrew Niefer · Nov 4, 2009

This blog post has environment variables you can set to debug jnlp. This has always worked for me.

  set JAVAWS_TRACE_NATIVE=1

  set JAVAWS_VM_ARGS=-Xdebug -Xnoagent -Djava.compiler=NONE 
            -Xrunjdwp:transport=dt_socket,address=8989,server=y,suspend=y
  javaws http://server:port/descriptor.jnlp

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