After upgrading a Grails application from 2.2.0 to 2.2.1 I keep getting the following error when attempting to debug a Grails application from GGTS via Debug as... -> Grails
I have no explanation why it didn't work, but I found a workaround.
I had another run target configured for the same app, but with a -Dgrails.env=...
setting, which I could launch without problems. I simply copied this config and removed the parameter. That way, I basically recreated the simple launch config which previously kept failing.
Problem gone.