Spring 引导未找到 RestController

Question

So I've got a simple spring boot app, @SpringBootApplication, a stub @Configuration and a @RestController all in the same package. Spring-boot-web-starter is there and the webserver comes up fine, actuator endpoints and all. But I cannot for the life of me get the app to pick up the @RestControllers.

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Main.class:

package com.iglossolalia.munin;

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

@SpringBootApplication
public class Main {
    public static void main(String[] args) {
        SpringApplication.run(MuninContext.class, args);
    }
}

MuninContext.class:

package com.iglossolalia.munin;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableAutoConfiguration
public class MuninContext {

}

MuninService.class:

package com.iglossolalia.munin;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class MuninService {
    private static final Logger LOG = LoggerFactory.getLogger(MuninService.class);

    public MuninService() {
        LOG.info("Started MuninService");
    }

    @GetMapping("/health")
    public String healthCheck() {
        return "pong";
    }
}

Tried explicitly adding the rest controller to the component scan with no luck there.

Answer 1

You have no @ComponentScan annotation in your MuninContext . Actually you can write SpringApplication.run(Main.class, args) in main method as Spring Initializr generate by default, you don't really need your context, because @SpringBootApplication work as configuration and contains @EnableAutoConfiguration, @ComponentScan, and some other annotations. Otherwise, as you pass your config class as argument in SpringApplication.run method, annotation @SpringBootApplication in Main class has no effect