This has been implemented in the current SVN version of DrJava. It should make its way into a stable release soon. If you would be willing to help us test this feature, post a comment here.
Thanks,
The DrJava Team
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Or a line to demark when you've reached 80 characters (or some other user-defined limit).
This has been implemented in the current SVN version of DrJava. It should make its way into a stable release soon. If you would be willing to help us test this feature, post a comment here.
Thanks,
The DrJava Team
We now have a right margin line.