SpringBoot遇到的一些問題

一、 找不到bean，提示required a bean of type 'xxx' that could not be found.

錯誤信息如下

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.


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APPLICATION FAILED TO START
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Description:

Field judgeService in com.demo.first.controller.judge.JudgesController required a bean of type 'com.demo.first.dao.judge.JudgeService' that could not be found.

The injection point has the following annotations:
	- @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.demo.first.dao.judge.JudgeService' in your configuration.

1. 可以看到 Field judgeService in com.demo.first.controller.judge.JudgesController required a bean of type 'com.demo.first.dao.judge.JudgeService' that could not be found.
   1. 提示 judgeService 在xx.xx.xxx.JudgesController中找不到

########### Controller 層#################
# 確實已經注入，進入下一層 service 層
@RestController
public class JudgesController extends BaseControl {

    @Autowired
    private JudgeService judgeService;
    ...
}


########### service 層#################
# service 層只是正常的接口，跳過，直接看實現層

########### serviceImpl 層#################
#發現是serviceImpl 未添加 @Service，到此問題原因找到

@Service
public class JudgeServiceImpl implements JudgeService {

    @Autowired
    private JudgesMapper judgesMapper;
    ...
}