When using the JDK 1.4+ assert keyword, it’s nice in Eclipse to enable them for all your launch configurations at once. The easiest way to do this is to specify a default VM argument for your installed JDK. You can do this by going to
Windows -> Preferences -> Java -> Installed JREs. Then select your JDK and click the Edit… button. In the “Default VM Arguments” box, add
That’s it! Now you’re assertion enabled for all java launch configurations (Run as JUnit, Run as Java App, etc). This is also a useful technique if you’ve got some testing infrastructure that needs special system properties to customize the launch configs to your local environment – just add your -D parameters in the same box.