CreateTodoServlet.java

import java.io.IOException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;

@SuppressWarnings("serial")
public class CreateTodoServlet extends HttpServlet {

    public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {

        System.out.println("Creating new Todo");
        User user = (User) req.getAttribute("user");

        if(user == null) {

            UserService userService = UserServiceFactory.getUserService();
            user = userService.getCurrentUser();
        }

        String summary = checkNull(req.getParameter("summary"));
        String description = checkNull(req.getParameter("description"));
        String url = checkNull(req.getParameter("url"));

        Dao.INSTANCE.add(user.getUserId(), summary, description, url);
        resp.sendRedirect("/TodoApplication.jsp");

    }

    private String checkNull(String s) {

        if(s == null) {
            return "";
        }

        return s;
    }
}