Using Eclipse
Eclipse can benefit for several plugins for improving code quality, in both adherence to the project's coding standard and in removing bugs.
Using Checkstyle
The Short Story
If you are already familiar with the Checkstyle Eclipse plugin, just configure it to use the checkstyle.xml at the root of the nuxeo sources: http://hg.nuxeo.org/nuxeo/file/5.2/checkstyle.xml.
Longer Story: installation and Configuration
Notes on Reported Issues
Using TPTP
Using FindBugs
Profiling with NetBeans Profiler
IDEA doesn't provide an integrated profiler and Eclipse's profiler, provided by the TPTP project, doesn't currently work on Mac OS, one can use NetBeans to profile the Nuxeo platform.