Hi,
the SQE suite which contains many debugging and code inspection tools for NetBeans has been updated lately. You can install plugins for FindBugs and more by simply adding the SQE update center to your update center list (Tools->Plugins->Settings).
The URL is:
http://deadlock.netbeans.org/hudson/job/sqe/lastStableBuild/artifact/build/full-sqe-updatecenter/updates.xml
Cheers,
Normen