Eclipse bug: This project has the JPA facet, but no JPA project could be created

After restarting Eclipse, I get the following error in my project:

This project has the JPA facet, but no JPA project could be created. See the error log for more details.

Nothing I've done (clean project, maven update, etc) will get rid of the error. My JPA Content icon remains greyed out.

It looks like this was a resolved bug at Eclipse bugs...but then why am I still getting it? Should I submit a bug report to Eclipse?