<p>I'm finding a couple for Java in general but no plugins for netbeans that I can see.</p>

<p>Thanks</p>

I've used the
PMD NetBeans plugin
, and
here
are the installation instructions (may be a little outdated, due to the speed of NetBeans development, but I got them to work).
Here's a list of
tools for static analyisis
.  Maybe you can cross-check for others that offer NetBeans support.
EDIT:
Those instruction are a little bit old, so I put a more up-to-date set
here
(links to my blog).