Trouble shooting and debugging Java[TM] Web Start Applications. 1.0) Tracing and getting additional trace output. 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