JConsole and Webstart

Question

I would like to JConsole my webstart application. I tried adding com.sun.management.jmxremote as a system property to JNLP file, but I could not find a way to make webstart applications run through the JDK's JRE (which is what JConsole needs).
So is there a nice way to JConsole webstart applications?

Answer 1

It is possible to attach a debugger to a JVM started by Web Start. I got the following batch file from another thread and I made it to work for me.
@echo off
setlocal
rem *** The following parameters must come from the JNLP file ***
set VM_ARGS=-ea -Xincgc -Xmx96m -Dcom.sun.management.jmxremote
set URL=http://mywebsite/downloads/myapp.jsp
rem *** This path must be absolute because javaws uses a simple string-compare against the expected path ***
set JAVAW_PATH=C:\Program Files\java\jdk1.5.0_04\bin\javaw.exe
rem *** Enable the following line to have Webstart dump all possible logs ***
rem set WS_DEBUG=-XX:TraceBasic=true -XX:TraceNetwork=true -XX:TraceCache=true -XX:TraceTemp=true -XX:TraceSecurity=true -XX:TraceExtensions=true
rem *** Enable the following line create a JNLP session on startup ***
set JDPA=-Xrunjdwp:transport=dt_socket,address=8888,server=y,suspend=n
set DEBUG=-Xdebug -Xnoagent -Djava.compiler=NONE %JDPA% -Dcom.sun.management.jmxremote
set WS_OPTS="-Xbootclasspath/a:%JAVA_HOME%\jre\lib\javaws.jar;%JAVA_HOME%\jre\lib\deploy.jar" "-Djnlpx.vmargs=%DEBUG%" "-Djnlpx.jvm=%JAVAW_PATH%" "-Djnlpx.splashport=-1" "-Djnlpx.home=%JAVA_HOME%\jre\bin" "-Djnlpx.remove=false" "-Djnlpx.offline=false" "-Djnlpx.heapsize=NULL,NULL" "-Djava.security.policy=file:%JAVA_HOME%\jre\lib\security\javaws.policy" "-Djnlpx.deployment.system.home=C:\WINDOWS\Sun\Java\Deployment" "-Djnlpx.deployment.user.home=C:\Documents and Settings\hxue.FRACTAL\Application Data\Sun\Java\Deployment" -DtrustProxy=true -Xverify:remote
echo on
"%JAVA_HOME%\jre\bin\java.exe" %VM_ARGS% -esa  %WS_OPTS% -classpath "%JAVA_HOME%\jre\lib\javaws.jar" com.sun.javaws.Main %WS_DEBUG% %URL%Save the content in a .bat file (I assume you use Windows) and run it from the command line. After your web start app starts running, attach your debugger to port 8888.