Comment by mmastrac: brett - we use OOPHM + Google's Eclispe plugin on Macs daily here. What we've done is create our own launch configs that reference the appropriate GWT libs rather than allowing the eclipse plugin to manage them.
The classpath in the target is (only include these exact items!): 1. source paths for project 2. binary path for project (used for any generators you might have) 3. gwt-oophm 4. "GWT SDK" from google's eclipse plugin If you are using FF3.5, the OOPHM available publicly won't work. We built our own FF3.5 OOPHM using an updated version of the xulrunner SDK. We're using this day-to-day with zero trouble. It's actually the same launch config we've used from GWT 1.4. When Google's eclipse plugin was released, we replaced the gwt-dev-mac with the automatic GWT SDK classpath entry. With trunk, we just added gwt-dev-oophm above the SDK classpath entry. One other thing to note: you might also have JVM args under Workspace > Prefs > Java > Installed JREs > ... > Default VM arguments. For more information: http://code.google.com/p/google-web-toolkit/wiki/OophmForMacBasedGwtContributors --~--~---------~--~----~------------~-------~--~----~ http://groups.google.com/group/Google-Web-Toolkit-Contributors -~----------~----~----~----~------~----~------~--~---