I have this at the beginning of a class:
@Grab(group = \'org.ccil.cowan.tagsoup\', module = \'tagsoup\', version = \'1.2\') class MyClass{...
Add the plugin snapshot update site for Kepler.
This seems to solve the "..no suitable classloader problem". Unfortunately, I still had to add the grape repo to the classpath for the project after this.