In order to make sure all JDT contributions go through a standard series of steps before they make it to bugzilla, we've updated the contributing to JDT/UI and the JDT/Core FAQ page. Please spend a few minutes reading through the steps and go ahead to submit a patch on bugzilla. Looking forward to more community participation in both JDT projects.
Also, whenever you start working on a bug, please drop a small comment on the bug page to say you intend to submit a patch, to avoid duplication of effort. Thanks! :)