java.lang.NoClassDefFoundError 異常解決方法

org.springframework.beans.factory.BeanCreationException:
 Error creating bean with name 'docket' defined in class path resource [com/XXX/XXX/config/SwaggerConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [springfox.documentation.spring.web.plugins.Docket]: Factory method 'docket' threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/http/MediaType

今天在想項目裏添加swagger的時候，發現跑不起來，bean組件一直失敗，提示java.lang.NoClassDefFoundError: org/springframework/http/MediaType

後來一看傻眼了，忘記加spring-boot-starter-web，怪不得跑不起來。

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異常：java.lang.NoClassDefFoundError: org/springframework/XXX/XXX
解決：找到對應的包，導入maven依賴就可。