My tomcat works without X11.

When I added an ability to view unit test results in Hudson, I was getting
Tomcat termination, with no clear indication what's wrong.

It turned out that since JFree chart triggers some AWT activity, and since I
don't have working X11, java was terminating, which is not good.

The solution that I have now is to start Tomcat with -Djava.awt.headless=true,
but maybe there is a way to do something in Hudson to eliminate this issue
altogether.