Java 玩2.3.8：DataSource用户为空？ bindFromRequest() 无法正常工作

Question

我这周开始学习 Play。现在我正在尝试编写一个在用户登录时创建会话的代码。抱歉，post 看起来有点乱，因为我是新用户，不允许 post 图片。

我正在使用 Java play 2.3.8 和 eclipse 4.4.1（我已经尝试了我在这里看到的其他技巧）

目前我总是收到此错误消息：

play.api.Application$$anon: Execution exception[[RuntimeException: java.lang.reflect.InvocationTargetException]] at play.api.Application$class.handleError(Application.scala:296) ~[play_2.11-2.3.6.jar:2.3.6] at play.api.DefaultApplication.handleError(Application.scala:402) [play_2.11-2.3.6.jar:2.3.6] at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$$anonfun$applyOrElse.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.11-2.3.6.jar:2.3.6] at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$$anonfun$applyOrElse.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.11-2.3.6.jar:2.3.6] at scala.Option.map(Option.scala:145) [scala-library-2.11.1.jar:na] Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at play.data.Form.bind(Form.java:394) ~[play-java_2.11-2.3.6.jar:2.3.6] at play.data.Form.bindFromRequest(Form.java:221) ~[play-java_2.11-2.3.6.jar:2.3.6] at controllers.Application.authenticate(Application.java:70) ~[classes/:na] at Routes$$anonfun$routes$$anonfun$applyOrElse$$anonfun$apply.apply(routes_routing.scala:209) ~[classes/:na] at Routes$$anonfun$routes$$anonfun$applyOrElse$$anonfun$apply.apply(routes_routing.scala:209) ~[classes/:na] Caused by: java.lang.reflect.InvocationTargetException: null at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_31] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_31] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_31] at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_31] at play.data.Form.bind(Form.java:391) ~[play-java_2.11-2.3.6.jar:2.3.6] Caused by: java.lang.RuntimeException: DataSource user is null? at com.avaje.ebeaninternal.server.lib.sql.DataSourcePool.(DataSourcePool.java:204) ~[avaje-ebeanorm-3.3.4.jar:na] at com.avaje.ebeaninternal.server.core.DefaultServerFactory.getDataSourceFromConfig(DefaultServerFactory.java:419) ~[avaje-ebeanorm-3.3.4.jar:na] at com.avaje.ebeaninternal.server.core.DefaultServerFactory.setDataSource(DefaultServerFactory.java:385) ~[avaje-ebeanorm-3.3.4.jar:na] at com.avaje.ebeaninternal.server.core.DefaultServerFactory.createServer(DefaultServerFactory.java:163) ~[avaje-ebeanorm-3.3.4.jar:na] at com.avaje.ebeaninternal.server.core.DefaultServerFactory.createServer(DefaultServerFactory.java:125) ~[avaje-ebeanorm-3.3.4.jar:na]

这是我的方法，叫做：

public static Result authenticate() {

    Form<Login> loginForm = Form.form(Login.class);

    Login loginUser = loginForm.bindFromRequest().get();


    if (!usersList.getUsers().contains(loginForm)) {
        return ok(login.render("test"));
    } else {
        session().clear();
        session("email", loginForm.get().email);
        System.out.println("ich bin hier");
        return redirect(routes.Application.login());

    }


}

这是模型（也有 getter 和 setter）：

public class Login {

public Login(){

}
public String email;
public String password;

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

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

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

这里是 scala.html 文档：

<div class="Login">
   <br>
    <br>
     <br>
      <br>

      <h1>Login</h1>

<form action="@routes.Application.authenticate()" method="post">
 <p><input type="email" name="email" placeholder="Email" value=""></p>
 <p><input type="password" name="password" placeholder="Password" value=""></p>
 <p class="submit"><input type="submit" name="Login" value="Login"></p>
</form>

最后但同样重要的是，我的浏览器中的错误消息显示第 70 行抛出了异常：

[RuntimeException: java.lang.reflect.InvocationTargetException]

System.out.println("nach loginform"); 68 69 //System.out.println(loginForm.bindFromRequest().toString()); 70 Login loginUser = loginForm.bindFromRequest().get(); 71 72 System.out.println(loginForm.toString()); 73// Form loginForm = form(Login.class).bindFromRequest(); 74
75 if (!usersList.getUsers().contains(loginForm)) {

提前感谢您帮助我解决这个问题

Answer 1

你是不是漏了什么

@Entity 
public class Login extends Model {

并检查 ebean.default="models.*" 行是否在 application.conf

中取消注释

Java 玩2.3.8：DataSource用户为空？ bindFromRequest() 无法正常工作

Java Play 2.3.8: DataSource user is null? bindFromRequest() does not work properly

html

java

eclipse

scala

playframework-2.0