Tracing Javaws launch

java jnlp java-web-start
PhilDin picture PhilDin · Dec 15, 2010 · Viewed 13.7k times · Source

I have a Java application which is launched via Java Webstart. Occasionally, following a new deployment of the application, it will happen that launching the application results in it being downloaded twice on every launch. I haven't got to the bottom of this but I think it may be related to our squid proxy which seems to interact badly with Java. What I would like, in order to investigate this further, is to see a trace of what javaws is doing. Is there any such option available to javaws?

Just a minor update, if Java is configured to show the console then hitting "5" when focussed on the console will set the logging level to 5 which is the most verbose logging level. This can be useful but it doesn't address cases where the application doesn't get this far.

Answer

jansohn picture jansohn · Oct 27, 2016

To enable full trace mode issue the following commands in a command line:

"C:\Program Files (x86)\Java\jre8\bin\javaws.exe" -userConfig deployment.trace true
"C:\Program Files (x86)\Java\jre8\bin\javaws.exe" -userConfig deployment.trace.level all

The trace files will be placed in %USERPROFILE%\AppData\LocalLow\Sun\Java\Deployment\log.

To disable full trace mode again:

"C:\Program Files (x86)\Java\jre8\bin\javaws.exe" -userConfig deployment.trace
"C:\Program Files (x86)\Java\jre8\bin\javaws.exe" -userConfig deployment.trace.level

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