I have loaded Fedora 8 into a virtual machine, and am attempting to run JasperServer 2.1 on this machine. Everything works fine until I attempt to run a report. Then I get the following error in the catalina.out file, and JasperServer consequently falls over. java: xcb_xlib.c:50: xcb_xlib_unlock: Assertion `c->xlib.lock' failed. When I checked the version of Java I get the following: [tellis@abrams ~]$ java -version java version "1.7.0" IcedTea Runtime Environment (build 1.7.0-b21) IcedTea Client VM (build 1.7.0-b21, mixed mode) I am not sure how to get JasperServer look for the installed JRE and not this one.