java - 返回类型与 RequestHandler 不兼容.handleRequest(Object, Context) 在 JAVA 中

Question

我试图运行下面的代码，源代码中提到的类已经定义除了authenticateUser，在突出显示的行错误消息“返回类型与 RequestHandler<Object,String>.handleRequest(Object, Context) 不兼容”是显示在下面加粗的代码行中。

请建议如何纠正这个问题。我正在尝试使用https://aws.amazon.com/blogs/developer/building-a-serverless-developer-authentication-api-in-java-using-aws-lambda-amazon-dynamodb-开发一个简单的用户身份验证系统和-amazon-cognito-part-1/作为参考。

package aws.java.lambda.demo;

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;

public class Authenticate_User implements RequestHandler<Object,  String> {

    @Override
    ERROR FACE-->public AuthenticateUserResponse handleRequest(Object input, Context context)<--ERROR FACED {
          
        AuthenticateUserResponse authenticateUserResponse = new AuthenticateUserResponse();
        @SuppressWarnings("unchecked")
        LinkedHashMap inputHashMap = (LinkedHashMap)input;
        User user = authenticateUser(inputHashMap);
        if(user!=null){
            authenticateUserResponse.setUserId(user.getUserId());
            authenticateUserResponse.setStatus("true");
            authenticateUserResponse.setOpenIdToken(user.getOpenIdToken());
        }else{
            authenticateUserResponse.setUserId(null);
            authenticateUserResponse.setStatus("false");
            authenticateUserResponse.setOpenIdToken(null);
        }
            
        return authenticateUserResponse;
    }

}