If you used the webAppCreator wizard (I see that you used the Eclipse plugin, but maybe they both used the same code inside), you should have ant script ( build.xml) generated for you. With it, you can run the GWT application through targets, therefore:
ant hosted - run placement mode (or development mode, I'm looking at a pretty old ant script)ant gwtc - compile JSant war, ant buildetc.
See what's in this file ( build.xml) for a better understanding of what is available and what you can do.
Update: see here for documentation on webAppCreator and available ant targets.
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