If you are developing Java on a Mac, chances are pretty high that you are using Eclipse for development. In addition you probably (or at least you better) have lots of RAM too, however, Eclipse is a bit conservative when allocating RAM. If you have tons of plugins installed, or the plugins are quite heavy (Android SDK, I am looking at you), then you can easily get in low memory situations.
The way to change the max amount of memory reserved for eclipse is somewhat buried and not trivial to find (unless you ask Google). The way to do it is to go into the eclipse folder, right click on Eclipse.app and then select „Show Package Contents“. Inside look for the eclipse.ini file (if you are running windows you can skip this step).
I just wanted to recommend Hudson to anyone who is in development (primarily Java) and uses continuous integration for their process. In my company we have been using various products from freeware to commercialware in the past. Recently I stumbled upon Hudson and was seriously impressed by it. It supports SVN, CVS out of the box and can run shell builds, ant builds and a few others right out of the box.
It supports plugins for a lot of other projects (FindBugs, PMD, Emma code coverage, checkstyle, Ruby, …) and is an awesome tool to monitor and improve the quality of your software. The most useful feature is that it can aggregate all results and present them in a timeline (trend). So you can see how your unit test code coverage has changed over time, …
The screenshot above illustrates some of the graphs and analysis that hudson can produce. I know that I have previously focused on mainly Mac projects but this one obviously also runs on a Mac, I use it at work and best of all: its open source!
For people who develop j2me applications on a regular basis this nifty tool might be able to be very useful. It basically is an ant task that can deploy a j2me application via bluetooth automatically. I am usually a little more conservative (and we do build multiple configurations where I keep switching between those) and I simply use Finder (select the JAD/JAR) and hit Apple-Shift-B.