Groovy in Eclipse

Download Eclipse: eclipse-java-helios-SR1-win32-x86_64

Copy and paste the following link into your Eclipse 'Install new software'
http://dist.springsource.org/release/GRECLIPSE/e3.6/

Error: Starting modern compiler while ANT execution

This error is because the eclipse uses a different JVM than the default one.

Solution
* Type java -version on the command prompt for windows
* Set the same java version in your eclipse.