Difficulty to run simple GWT application on tomcat server.

I am creating a gwt application as following steps:
First install gwt plugin in my eclipse(Helios).
Create GWT project
Add Dynamic web plugin
going to property page of the project
project Facets tab
Select Dynamic Web Module and java
ok to apply changes.
Write code
and i try to run on server tomcat7 then it shows resources not
available.But when i run as internal server of gwt as just right
clicking on project and selecting run as web application.
then it run successfully. so please help to run my application on
tomcat server.
Thanks
Rahul

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