得到“无可用消息". Spring Boot + REST应用程序出错 [英] Getting "No message available" error with Spring Boot + REST application

问题描述

我创建了演示Spring Boot项目并实现了Restful服务，如下所示

I have created demo Spring Boot project and implemented Restful services as shown here

@RestController
public class GreetingsController {
    @RequestMapping(value="/api/greetings", method=RequestMethod.GET, produces=MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<String> getGreetings(){
        return new ResponseEntity<String>("Hello World", HttpStatus.OK);
    }
}

当我尝试使用URL为 http://localhost:8080/api/greetings的Postman工具调用该服务时"作为请求方法GET，我收到以下错误消息

When I tried to invoke the service with Postman tool with url "http://localhost:8080/api/greetings" as request method GET, I am getting below error message

{
  "timestamp": 1449495844177,
  "status": 404,
  "error": "Not Found",
  "message": "No message available",
  "path": "/api/greetings"
}

对于每个Spring Boot应用程序，我不必在web.xml中配置Spring Dispatcher servlet.

Per Spring Boot application, I don't have to configure the Spring Dispatcher servlet in web.xml.

有人可以帮我找出这里的缺失点吗?

Can someone help me to find out the missing point here?

推荐答案

您可能缺少@SpringBootApplication:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class, args);
    }
}

@SpringBootApplication包括@ComponentScan，该文件扫描其所在的程序包和所有子程序包.您的控制器可能不在其中任何一个中.

@SpringBootApplication includes @ComponentScan which scans the package it's in and all children packages. Your controller may not be in any of them.

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