What's the exception trace? Did you talk to your vendor or group that built Charts about this issue?
Chart vendor suggested to set the headless to true. works fine on Jboss 3.2.3
this is the exception: 07/03/27;13:13:07;207; ERROR logging.util.LoggerStream;:(LoggerStream.java:write():152) - java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it.