I'm trying to change and extend the palette of activiti designer. I have followed the user guide, used the examples and successfully created the jar file. But if I put this jar file to the Activiti Designer Extensions user library nothing is happen at the activiti designer, the palette doesn't changed. I use the activiti designer 5.15 with Eclipse classic 4.2.2 and Eclipse Indigo . I tried re-opening diagram as well as restarting Eclipse.