JAVA入门大坑：expected at least 1 bean which qualifies as autowire candidate. Dependency annotations

最新推荐文章于 2025-05-12 18:38:20 发布

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#java #jvm #开发语言 #mysql

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本文探讨了SpringBoot项目中出现的依赖注入失败问题，具体表现为在启动过程中遇到的TestDao注入错误。文章分析了异常原因，并给出了相应的解决办法，包括正确配置@SpringBootApplication注解和确保相关Bean已定义。

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Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloWord': Unsatisfied dependency expressed through field 'testMapper': Error creating bean with name 'testMapperImpl': Unsatisfied dependency expressed through field 'testDao': No qualifying bean of type 'com.example.myspringboot.Dao.TestDao' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

Description:

Field testDao in com.example.myspringboot.Service.TestMapperImpl required a bean of type 'com.example.myspringboot.Dao.TestDao' 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.example.myspringboot.Dao.TestDao' in your configuration.

不要用这个注释：

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})

只用：

@SpringBootApplication

//@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
//@MapperScan()
@SpringBootApplication
//@EnableScheduling
public class MySpringBootApplication {
    public static void main(String[] args) {
        SpringApplication.run(MySpringBootApplication.class, args);
    }
}

dao层无法注入service