java.lang.NoSuchMethodException : userAuth. User.()

Question

我有带验证的类(class):

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;
    }

}

当我验证值时，我收到了消息:

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

问题出在哪里？

Answer 1

消息java.lang.NoSuchMethodException: userAuth.User.<init>()意味着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该可以解决这个问题:

public class User {

    public User() {

    }

    ..
}