could not be registered. A bean with that name has already been defined in file

今天在使用SpringBoot中的拦截器的功能是遇到了如下的BUG,为了让屏幕前的您尽快排雷,特此记录一下 ,报错信息如下:

Description:

The bean 'noLoginInterceptor', defined in class path resource [com/zwl/crm/config/MyConfig.class], could not be registered. A bean with that name has already been defined in file [E:\workplace\MyProject\crm\target\classes\com\zwl\crm\Interceptor\NoLoginInterceptor.class] and overriding is disabled.

Action:

Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true

简单看一下报错信息,说“could not be registered”,注入失败”?我的代码如下图:

could not be registered. A bean with that name has already been defined in file_第1张图片

首先想到的是@Bean没有被识别,于是改变写法使用IOC注入:

could not be registered. A bean with that name has already been defined in file_第2张图片

项目成功的运行起来了,很纳闷,这是怎么回事?仔细阅读报错信息“ A bean with that name has already been defined in file”,说明Bean被重复注册了,通过查找资料得知:

在启动类上加@MapperScan("需要扫描的包路径"),在项目启动时会自动将扫描到的Bean进行注册,我的是在配置拦截器时加了@Component

could not be registered. A bean with that name has already been defined in file_第3张图片

这个和配置类中的@Bean重复的为一个Bean进行注册,到此彻底明白了。

could not be registered. A bean with that name has already been defined in file_第4张图片

解决方案总结:

1.删除拦截器类级别的@Component注解

2.将配置类中的@Bean改为IOC自动注入

3.application配置文件里加一行:spring.main.allow-bean-definition-overriding: true 。当遇到同样名字的时候,是否允许覆盖注册

第三种方案我没试,有兴趣的可以尝试一下。

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