title: Fastest possible j2objc integration
body: <p>I just want to share our j2objc setup with you guys, as it took us some time to fine-tune it in one of our projects. We're currently compiling 400+ files using j2objc, have classname duplicates in packages, have to be able to debug java code in xcode so that we can put breakpoints and step thru java code directly (not objc). The last tweak we made to improve build times saved us 50% of the build time on CI, which is a great help compared to the original (officially suggested) way of doing it.</p>