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Preview Server FAQ
When I deploy my applications, I get a HTTP 503 error SERVICE_UNAVAILABLE?
You probably deployed java utility module as a stand alone applications. The current support in the Preview Server, is very limited and doesn't support Java Utility modules deployed as a stand alone. [bug 305519]
When I deploy my Web module, I get NoClassDefFoundError when loading the serlvet.
Check if you Web Application has servlets in default packages. If it does, change them to named packaged.