JOE aborts due a failed cairo Assertion

Users reported to run into problems when using JOE and creating a new job. JOE aborts and the following error message appears:

java: cairo-misc.c:380: _cairo_operator_bounded_by_source: Assertion 'NOT_REACHED' failed.

This behaviour has been stated for JobScheduler release 1.7 with CentOS 6.6 but might not be restricted to that release or os version.

The recommended solution is to 

• rename ./user_bin/jobeditor_environment_variables.sh-example to ./user_bin/jobeditor_environment_variables.sh
• insert the following line at the end of ./user_bin/jobeditor_environment_variables.sh

JAVA_OPTIONS=-Dorg.eclipse.swt.internal.gtk.cairoGraphics=false