报错：Consider defining a bean of type 'xxx' in your configuration.

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报错：Consider defining a bean of type 'xxx' in your configuration.

今天在做多模块项目demo时启动子模块时报错

2018-09-17 16:26:42.756 WARN 8640 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'testController': Unsatisfied dependency expressed through field 'commonMethod'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.demo1.helper.CommonMethod' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 2018-09-17 16:26:42.758 INFO 8640 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat] 2018-09-17 16:26:42.861 INFO 8640 --- [ main] ConditionEvaluationReportLoggingListener : Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2018-09-17 16:26:43.028 ERROR 8640 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter : *************************** APPLICATION FAILED TO START *************************** Description: Field commonMethod in com.example.demo2.controller.TestController required a bean of type 'com.example.demo1.helper.CommonMethod' that could not be found. Action: Consider defining a bean of type 'com.example.demo1.helper.CommonMethod' in your configuration. Process finished with exit code 1

错误原因和解决方案也给出了提示：expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

原因分析：在默认情况下使用 @Autowired 注释进行自动注入时，Spring 容器中匹配的候选 Bean 数目必须有且仅有一个。当找不到一个匹配的 Bean 时，Spring 容器将抛出 异常，并指出必须至少拥有一个匹配的 Bean。

所以只要将 @Autowired 改成 @Autowired(required=true) 就可以了

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