Estimate was ridiculous. Work is under way to emulate JSR 303 Bean Validation in GWT, should land in M4
Can I please know if this was resolved for Roo 1.1.3 as discussed here - https://jira.springsource.org/secure/ReleaseNote.jspa?projectId=10340&version=11486
Client side validation is in slow but steady development in GWT trunk, and hasn't been included in a public release yet.
Please track http://code.google.com/p/google-web-toolkit/issues/detail?id=343