So, I was working on my summer of code project, and I have groovy code along side my java code. I needed to add the groovyc ant task. While i assumed that groovy-all-1.5.6.jar, (note the all) contained everything that was needed, guess what folks, it doesn't! I spent the greater part of the evening tracking down this problem, and then i added the ant-1.7.0.jar and ant-launcher.jar jars, after that suddenly everything worked. That begs the question though, why isn't everything included in the groovy jar?
The problem: NoClassDefFoundError on MatchingTask class.
I figured I would put this out there for others in case they too experience what I did.