Just set the following parameter:
set JAVAWS_VM_ARGS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8200
where address specifies the port on which you can connect for remote debugging. Then launch your application using javaws yourfile.jnlp
Outra alternativa:
1.1) Using version 1.5.0 or 1.6.0.
Use the Java[TM] Control Panel to turn
on console and tracing to a file. By default the file will be put in log directory under $deployment.user.home. (for per-platform definition of $deployment.user.home see the Deployment Guide )
Turn on additional tracing messages by adding the following property to the deployment.properties file:
deployment.trace.level=all.
You can also use specific options delimited by "|", all is the same as:
deployment.trace.level=basic|cache|net|temp|security|ext|liveconnect.
The last 2 in the above may only apply to Java[TM] Plug-in and have no effect on Java Web Start apps.
