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It would be great to have checkstyle implemented in NB. Our company uses it, but since nbcheckstyle seems not to work with nb 5.5.1 and 6.0 I have to switch to eclipse for this task -> http://eclipse-cs.sourceforge.net/screen_shots.html
checkstyle module should be available http://checkstyle.sourceforge.net/
I also think, checkstyle should be a standard part of the IDE. The formatting should respect the checkstyle configuration.
Until this is a standard part, it might be a good idea to add the following update center by default: http://deadlock.netbeans.org/hudson/job/sqe/lastStableBuild/artifact/build/full-sqe-updatecenter/updates.xml (from project Software Quality Environment: http://kenai.com/projects/sqe/pages/Home )
It is supported at least for maven projects. Open the properties of a maven project and there is a category "Formatting/Checkstyle Formatting". (Tested in 7.3)