NoSuchBeanDefinitionException:No qualifying bean of type 解决方法
2017-01-15 22:43
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最近在给团队里面的新成员做培训,发现有些问题新成员特别容易犯,其中一条就是通过spring的AnnotationConfigApplicationContext去获取依赖注入的实例对象的时候, 经常会报类似这种的异常:
为什么会出现这种异常呢,主要是现在的spring早就已经摆脱了之前一堆xml配置文件的情况,都是通过注解配置的方式进行依赖注入了,通常情况下,我们会有一个配置类,然后通过AnnotationConfigApplicationContext进行加载:
然后再通过AnnotationConfigApplicationContext去获取实例对象:
通常出现异常的情况也是这个阶段,原因就在于忘记在配置项中申明扫描哪个包的类了,比如这就是一个错误的配置项类:
如何解决这个问题?我们只需要通过ComponentScan申明即可:
Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [di.UseFunctionService] is defined
为什么会出现这种异常呢,主要是现在的spring早就已经摆脱了之前一堆xml配置文件的情况,都是通过注解配置的方式进行依赖注入了,通常情况下,我们会有一个配置类,然后通过AnnotationConfigApplicationContext进行加载:
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(DiConfig.class);
然后再通过AnnotationConfigApplicationContext去获取实例对象:
UseFunctionService useFunctionService = context.getBean(UseFunctionService.class);
通常出现异常的情况也是这个阶段,原因就在于忘记在配置项中申明扫描哪个包的类了,比如这就是一个错误的配置项类:
package di; import org.springframework.context.annotation.Configuration; /** * 配置项,忘记申明扫描哪个包 */ @Configuration public class DiConfig { }
如何解决这个问题?我们只需要通过ComponentScan申明即可:
package di; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; /** * 通过ComponentScan申明扫描di包下面的类 */ @Configuration @ComponentScan("di") public class DiConfig { }
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