Hello. I've followed serveral tutorials and read official docs at code.google.com, but still didn't manage to resolve this thing.

I am creating simple service that'll check if user can be logged.

CLIENT SIDE:

public interface LoginService extends RemoteService {

    /**
     * Checks, if user has valid login.
     * @param user User's login.
     * @return True if such a login is in the database.
     */
     boolean isValidUser(User user);
}

And here is Async interface:

public interface LoginServiceAsync {

    /**
     * Checks, if user has valid login.
     * @param user User's login.
     * @param callback the callback to return True if such a login is in the database.
     */
     void isValidUser(User user, AsyncCallback<Boolean> callback);
}

SERVER SIDE:

public class LoginServiceImpl extends RemoteServiceServlet implements LoginService {

    /**
     * serial version UID
     */
    private static final long serialVersionUID = 1044980345057997696L;

    /**{@inheritDoc} */
    @Override
    public boolean isValidUser(User user) {
        boolean success = true; //TODO change
    }

}

Now I have entry point class MailClient.java. I append here widget like:

CustomWidgets.getLoginWidget(this); // access rootPanel and append widget

Now I need to make actual call to my service, and here is problem:

LoginServiceAsync loginService = (LoginServiceAsync) GWT.create(LoginService.class);
                User user = new User(boxName.getText(), boxPassword.getText());
                AsyncCallback<Boolean> callback = new AsyncCallback<Boolean>() {

                    @Override
                    public void onFailure(Throwable caught) {
                        Window.alert(caught.getMessage()); //TODO change
                    }

                    @Override
                    public void onSuccess(Boolean result) {
                        Window.alert("success"); //TODO change
                    }
                };
                ((ServiceDefTarget) loginService).setServiceEntryPoint(GWT.getModuleBaseURL()+"login"); // dunno what should be here

So to recap, I don't know how to set service's entry point.

Here's my MailClient.gwt.xml file:

<module>
    <inherits name="com.google.gwt.user.User"/>
    <inherits name="com.google.gwt.user.theme.standard.Standard"/> 
    <entry-point class="com.xorty.mailclient.client.MailClient"/>
    <servlet path="/login"
        class="com.xorty.mailclient.server.servlets.LoginServiceImpl" />
    <inherits name="com.xorty.mailclient.MailClient"/>
    <inherits name="com.xorty.mailclient.MailClient"/>
    <inherits name="com.xorty.mailclient.MailClient"/>
    <inherits name="com.xorty.mailclient.MailClient"/>
    <inherits name="com.xorty.mailclient.MailClient"/>
</module>

My web.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
        xmlns="http://java.sun.com/xml/ns/j2ee" 
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
            http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <!-- Default page to serve -->
    <welcome-file-list>
        <welcome-file>MailClient.html</welcome-file>
    </welcome-file-list>
    <servlet>
        <servlet-name>LoginService</servlet-name>
        <servlet-class>com.xorty.mailclient.server.servlets.LoginServiceImpl</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>LoginService</servlet-name>
        <url-pattern>/com.xorty.mailclient.MailClient/login</url-pattern>
    </servlet-mapping>
</web-app>

And here is screenshot of project structure: