I recently wrote an article for IBM DeveloperWorks about Java development using Eclipse under Mac OS X. While the Java development environment is fully integrated into Mac OS X, the Eclipse integrated development environment (IDE) brings a fully integrated Java development environment to Mac OS X that provides a consistent cross-platform experience. The article shows developers how to: import existing Xcode projects into Eclipse, tweak key bindings, and integrate Eclipse with the Mac OS X-bundled Concurrent Versions System (CVS).

You can read the entire article here: Maximize your Mac OS X Java development experience using Eclipse