本文个人博客地址：https://www.leafage.top/posts/detail/21622MARQ
【NoClassDefFoundError（GenericObjectPoolConfig|NoClassDefFoundError：GenericObjectPoolConfig 问题）】记录一个redis的异常，今天更新测试环境的服务，该服务中使用了 spring-boot-starter-data-redis 的依赖，在发布测试的时候报错了，很尴尬。为啥呢，我本地运行的好好的呀。。。（是不是你的日常？）。
这个错的具体信息如下：

62021-06-22 09:23:17,291 [application-name] [main] WARNo.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisConnectionFactory' defined in class path resource [org/springframework/boot/autoconfigure/data/redis/LettuceConnectionConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory]: Factory method 'redisConnectionFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig 72021-06-22 09:23:17,343 [application-name] [main] ERROR o.s.b.SpringApplication - Application run failed 8org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisConnectionFactory' defined in class path resource [org/springframework/boot/autoconfigure/data/redis/LettuceConnectionConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory]: Factory method 'redisConnectionFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig 9at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:657) 10at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:637) 11at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1341) 12at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1181) 13at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) 14at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) 15at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) 16at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) 17at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) 18at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) 19at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) 20at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) 21at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) 22at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) 23at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) 24at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) 25at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405) 26at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) 27at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) 28at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) 29at com.ichinae.imis.MgrApplication.main(MgrApplication.java:20) 30at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 31at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 32at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 33at java.lang.reflect.Method.invoke(Method.java:498) 34at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49) 35at org.springframework.boot.loader.Launcher.launch(Launcher.java:107) 36at org.springframework.boot.loader.Launcher.launch(Launcher.java:58) 37at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88) 38Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory]: Factory method 'redisConnectionFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig 39at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) 40at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:652) 41... 28 common frames omitted 42Caused by: java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig 43at org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration$LettucePoolingClientConfigurationBuilder.(LettucePoolingClientConfiguration.java:94) 44at org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration.builder(LettucePoolingClientConfiguration.java:51) 45at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$PoolBuilderFactory.createBuilder(LettuceConnectionConfiguration.java:159) 46at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.createBuilder(LettuceConnectionConfiguration.java:107) 47at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.getLettuceClientConfiguration(LettuceConnectionConfiguration.java:92) 48at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.redisConnectionFactory(LettuceConnectionConfiguration.java:74) 49at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 50at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 51at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 52at java.lang.reflect.Method.invoke(Method.java:498) 53at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) 54... 29 common frames omitted 55Caused by: java.lang.ClassNotFoundException: org.apache.commons.pool2.impl.GenericObjectPoolConfig 56at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 57at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 58at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151) 59at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 60... 40 common frames omitted

像往常一样，copy 异常信息，粘贴的google搜一下，然后介绍的都是价格以apache common pool2 的依赖，然后还有竟然说重建一个项目到。。。（兄弟你搞笑的吧）。

来说下这个异常的原因，报这个错的去看下你的配置文件中是不是配置了 lettuce.pool 的配置信息，
如果有那就对了，解决的方法有两个：

1. 因为启动时来加载器找不到common-pool2的相关类，那么就给它把相关类引入，添加依赖：
   

   org.apache.commons commons-pool2

   
   
2. 移除lettuce.pool的配置，如果你都用不到，或者都是复制过来的配置，就用默认的就可以，删除这个相关配置。

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