peclements,
Sorry that you are seeing this issue with MyEclipse.
Can you answer some more questions for us to understand the issue better ?
1) Are you running the application on MyEclipse Tomcat ? Are you running Groovy on the server ?
2) Can you recheck if you have included the “jersey-server.jar“ in the classpath and under web-inf/lib ?
3) Also take a look at this thread which discusses the same issue :
http://www.myeclipseide.com/PNphpBB2-printview-t-26453-start-0.html
4) Clear the contents of the .log file which is located at <workspace dir>/.metadata/.log , replicate the issue and copy paste the entire contents of the .log file here for us to investigate it further.