what gwt libraries should be included in production build

do I need gwt-servlet and gwt-user library, in my pom.xml ?
I was uploading my gwt app on app engine, I got the error
saying gwt-user jar is too big, and I need to split it.
I decided to comment out gwt-user, and I didn't get any error or warning,
which made me wonder what dependencies I need to include in my build ?
and is there a library that need to be present in development mode, that should be excluded in final build ?

Thank You

        <dependency>
            <groupId>com.google.gwt</groupId>
            <artifactId>gwt-servlet</artifactId>
            <version>${gwt.version}</version>
        </dependency>

        <!--<dependency>-->
            <!--<groupId>com.google.gwt</groupId>-->
            <!--<artifactId>gwt-user</artifactId>-->
            <!--<version>${gwt.version}</version>-->
            <!--<scope>provided</scope>-->
        <!--</dependency>-->

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