This was mentioned at this year's JavaOne: http://www.cs.umd.edu/~pugh/MistakesThatMatter.pdf , page 33 How do we find this issues? Or, who's gonna run FindBugs on 5.1? Could we do this as part of some build report? Paul? Probably useful for all projects, to issue some warning about bad code usage, as reported by Findbugs.