protected SystemProcess getSystemProcessFromEventContext(final NexusTaskEventStarted<?> evt) {
   return (SystemProcess) evt.getEventContext().get(SystemProcess.class.getName());
 }
 protected void putSystemProcessFromEventContext(
     final NexusTaskEventStarted<?> evt, final SystemProcess prc) {
   evt.getEventContext().put(SystemProcess.class.getName(), prc);
 }