JAVA Control Panel and trace folder location in Linux

Newbie & Debugging Questions
#1

I have installed Linux on a machine to be able to debug a JAVA JNLP application especially for Linux (it runs under Windows but not under Linux). The game window is opened, but then killed, and I need to know what is going on.

I need to “enable tracing” from the JAVA Control Panel, in order to see what the problem is. Thing is that I was unable to locate the JAVA Control Panel. I found on another forum that it has the filename “ControlPanel”, but when I do a search on the Linux machine, I can’t find it. I’m using OpenSUSE 11.1 with Gnome.

Also if I would enable tracing, I still would need to know where these “.trace” files are put. On a windows machine they are put in the “Application data” folder. Any ideas?

#2

The control panel is accessed by running jcontrol. I assume that Suse puts a symlink to it in /usr/bin.

I don’t know what this tracing is, though, so I can’t help there. However, assuming that it isn’t to stdout you could always run updatedb and locate.

#3

Hmmm, jcontrol is not present in this version. Could I ask what distribution you are using? Or did you install JAVA manually? Then maybe I should give that a try, in order to know where the Control Panel is getting installed at.

#4

I use Debian lenny, but I installed Java myself because I want a moderately recent version. However, I’m pretty sure that Debian set up the symlink in /usr/bin because I wouldn’t have bothered using the alternatives system.

#5

In your home directory, you should find a directory called “.java/deployment”.

#6

Thanks for all the feedback. I have discovered that the game does run under Linux when I turn of the sound. But that doesn’t do me any good for debugging.

Thing is that I do have a “.java” directory in my home directory, but it does not contain “deployment”. And I’m still not any closer to finding the control panel…

#7

It’s called ControlPanel, and it’s found in the bin directory of the jre installation (which, on my Ubuntu system, is /usr/lib/jvm/java-6-sun). When I installed the JRE that bin directory was put into my path so all I have to do is type ControlPanel to get it to appear. From there it’s just a case of Advanced->Enable Tracing/Logging, and then there should be something appears in the aforementioned deployment directory.

Cas :slight_smile: