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项目启动报错怎么办？看看你Spring自动注入用对了嘛?@Autowired XxxService注入问题解...

 3 years ago
source link: https://segmentfault.com/a/1190000041213159
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项目启动报错怎么办？看看你Spring自动注入用对了嘛?@Autowired XxxService注入问题解决

  • 在Controller层使用 @Autowired注入Service时,提示Bean中没有Service

  • 在Service接口中使用 @Component注入后,启动项目问题提示:

    The web application [ROOT] appears to have started a thread named [DubboClientReconnectTimer-thread-2] but has failed to stop it.
This is very likely to create a memory leak

  • 提示Bean中没有Service:

    • 因为没有将Service注入到Spring容器中,可以通过 @Component或者 @Service注解注入

  • 在Service中使用注解注入到容器后,启动项目会报错:

    • 因为在Service接口注入,同时注入了两个Bean

    • 在Service接口注入,会将实现Service接口的子类也注入到容器中,所以会导致Dubbo重复性线程错误

  • 在Service的实现类ServiceImpl上,使用 @Component或者 @Service注解将Service注入到Spring容器中

  • 如果是使用Dubbo的SpringBoot项目,可以在Service实现类使用如下注解

    @com.alibaba.dubbo.config.annotation.Service
@org.springframework.stereotype.Service

  • 注意: 要将Service实现类注入到容器,而不是Service接口

  • Spring容器注入规则

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