Fedora > java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment

Problem 

The following exception was encountered when running a java program on Fedora:
java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment

Assumptions: you know what an xserver is.

Solution

Basically, the java program is trying to access the xserver, and can't.

If it should be accessing the xserver, make sure the xserver is started/running:

• e.g. ps -ef | grep Xvfb

If it shouldn't be accessing an xserver, make sure the "DISPLAY" environment variable is unset:

• unset DISPLAY

See also:
Fedora > install Xvfb as a service