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Error Message

package models;

import com.avaje.ebean.Model;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class User extends Model {

    @Id
    public String email;
    public String name;
    public String password;

    public User(String email, String name, String password) {
        this.email = email;
        this.name = name;
        this.password = password;
    }

   public  Finder<String,User> find = new Finder<String,User>(
            String.class, User.class
    );

    public  User authenticate(String email, String password) {
        return find.where().eq("email", email)
                .eq("password", password).findUnique();
    }


}

package controllers;
import models.User;
import play.data.Form;
import play.mvc.Controller;
import play.mvc.Result;
import views.html.index;
import views.html.login;

public class Application extends Controller {


    public Result index() {


        return ok(index.render("hello"));
    }

    public Result login() {

        return ok(login.render(form(Login.class)));
    }


    public  Result authenticate() {
        Form<User> loginForm = Form.form(User.class).bindFromRequest();
        if (loginForm.hasErrors()) {
            return badRequest(login.render(loginForm));
        } else {
            session().clear();
            session("email", loginForm.get().email);
            return redirect(
                    routes.Application.index()
            );
        }
    }


    public class Login {
        public String email;
        public String password;
        public User user;

        public String validate() {
            user.authenticate(email, password);
            if (user == null) {
                return "Invalid user or password";
            }
            return null;
        }


    }
}

@(form: Form[Application.Login])
<html>
    <head>
        <title>Zentasks</title>
        <link rel="shortcut icon" type="image/png" href="@routes.Assets.at("images/favicon.png")">
        <link rel="stylesheet" type="text/css" media="screen" href="@routes.Assets.at("stylesheets/login.css")">
    </head>
    <body>
        <header>
            <a href="@routes.Application.index" id="logo"><span>Zen</span>tasks</a>
        </header>

        @helper.form(routes.Application.authenticate) {
            <h1>Sign in</h1>
            @if(form.hasGlobalErrors) {
                <p class="error">
                @form.globalError.message
                </p>
            }

            <p>
                <input type="email" name="email" placeholder="Email" value="@form("email").value">
            </p>
            <p>
                <input type="password" name="password" placeholder="Password">
            </p>
            <p>
                <button type="submit">Login</button>
            </p>
        }

    </body>
</html>

# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~

# Home page
GET     /                           controllers.Application.index()
GET     /login                  controllers.Application.login()
POST    /login                      controllers.Application.authenticate()
# Map static resources from the /public folder to the /assets URL path
GET     /assets/*file               controllers.Assets.at(path="/public", file)