java.lang.NoSuchMethodException：userAuth.User。< init>（） [英] java.lang.NoSuchMethodException: userAuth.User.<init>()

问题描述

我的课程有验证：

public class User {
    @Size(min=3, max=20, message="User name must be between 3 and 20 characters long")
    @Pattern(regexp="^[a-zA-Z0-9]+$", message="User name must be alphanumeric with no spaces")
    private String name;

    @Size(min=6, max=20, message="Password must be between 6 and 20 characters long")
    @Pattern(regexp="^(?=.*[0-9])(?=.*[a-zA-Z])([a-zA-Z0-9]+)$", message="Password must contains at least one number")
    private String password;

    public User(String _name, String _password){
        super();
        name = _name;
        password = _password;
    }

    public String getName(){
        return name;
    }

    public String getPassword(){
        return password;
    }

    public void setPassword(String newPassword){
        password = newPassword;
    }

}

当我验证价值时，我得到了消息：

when I validate values, I got the message:

SEVERE: Servlet.service() for servlet osAppServlet threw exception
java.lang.NoSuchMethodException: userAuth.User.<init>()

问题出在哪里？

推荐答案

消息 java.lang.NoSuchMethodException：userAuth.User。< init>（）表示有人试图在没有任何参数的情况下调用构造函数。添加默认构造函数应解决此问题：

The message java.lang.NoSuchMethodException: userAuth.User.<init>() means that someone tried to call a constructor without any parameters. Adding a default constructor should solve this problem:

public class User {

    public User() {

    }

    ..
}

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