i am using maven to build cassandra. i didnt have in mind to contribute
build system because you are not interested in maven. In maven you just
call findbugs plugin, nothing special to contribute. I had in mind patch
fixing various FB discovered problems. but because its difficult to post
it as many JIRA tickets, it will not be much useful. Maybe post report
to list?
you can create exlude list for FB with list of known false positives,
its an xml file.
<?xml version="1.0" encoding="UTF-8"?>
<FindBugsFilter>
<Match>
<Bug pattern="SWL_SLEEP_WITH_LOCK_HELD" />
</Match>
</FindBugsFilter>