If you have downloaded GWT 2.8.2 from Maven, then the "colt" library (and lots of other libs) is not bundled into gwt-dev.jar. If your project does not use Maven then you need to add these libraries manually to your class path.--
Alternatively download GWT 2.8.2 from gwtproject.org, then all theses dependencies are bundled into gwt-dev.jar and things should just work as usual.
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