I know this seems odd, given GWT doesn't support reflection, but in the scala-library there are a few places that throw this exception even though it's not reflection-related.
We can patch around that, but given that, in theory anyway, other users could use this exception for non-reflection purposes as well, it doesn't seem like a big deal to include it in the emulated java lang. http://gwt-code-reviews.appspot.com/1529807/ -- http://groups.google.com/group/Google-Web-Toolkit-Contributors
