现象

如题，启动项目时，报错如下：

***************************
APPLICATION FAILED TO START
***************************

Description:

Field messageTemplateService in com.xxx.XxxxxController required a bean of type 'com.xxx.XxxxxService' 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.xxx.XxxxxService' in your configuration.

代码

• 代码1

    //引用的地方
    @Autowired
    private MessageTemplateService messageTemplateService;

• 代码2

@Configuration
@ConditionalOnClass(XxxxxService.class)
public class XxxxxServiceAutoConfiguration {
    
    @Bean
    @ConditionalOnMissingBean(XxxxxService.class)
    public XxxxxService uploadService(TokenConfigService tokenConfigService) {
        log.info("XxxxxService build start");
        XxxxxService xxxxxService = new XxxxxService();
        xxxxxService.setTokenConfigService(tokenConfigService);
        log.info("XxxxxService build end");
        return xxxxxService;
    }
}

• 代码3

@Configuration
@ConditionalOnClass(UploadService.class)
public class UploadServiceAutoConfiguration {
    
    @Bean
    @ConditionalOnMissingBean(UploadService.class)
    public UploadService uploadService(TokenConfigService tokenConfigService) {
        log.info("UploadService build start");
        UploadService uploadService = new UploadService();
        uploadService.setTokenConfigService(tokenConfigService);
        log.info("UploadService build end");
        return uploadService;
    }
}

分析

1. 本质是对象XxxxxService在spring容器不存在。
2. 删除【代码2】，恢复正常
3. 分析【代码2】与【代码3】互相影响，比对发现@Bean修饰的方法名称重复了，改成不一样的解决~