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This is a fairly common problem that newbies using Google Web Kit within Eclipse encounter with their the Java Runtime Environment. Chances are you just upgraded your JRE to 1.6.0_31.
The solution is to add an extra parameter in your virtual machine run configuration using either:
-Dappengine.user.timezone=UTC
If that does not work, try this.
-Dappengine.user.timezone.impl=UTC
To go to the run configuration, do the following:
- Right click project name
- Go to Run As > Run Configurations
- Go to Arguments tab
- Under VM Arguments, add the extra parameter, then click Run button
There you go! That should get you back into development mode!

Any particular reason this would only apply to “newbies”? Not taking offence or anything, just curious.
@john: hi. i said newbies because i believe it is common for programmers starting out with gwt to encounter this problem.
@tech Fair enough. Anyway, this post helped a lot - thanks
@john: no harm done. glad it helped you. please don’t forget to +1 and like the post. thank you