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记录一个 redis 的异样，明天更新测试环境的服务，该服务中应用了 spring-boot-starter-data-redis 的依赖，在公布测试的时候报错了，很难堪。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：
6 2021-06-22 09:23:17,291 [application-name] [main] WARN o.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
7 2021-06-22 09:23:17,343 [application-name] [main] ERROR o.s.b.SpringApplication - Application run failed
8 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
9 at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:657)
10 at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:637)
11 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1341)
12 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1181)
13 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556)
14 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516)
15 at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324)
16 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
17 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322)
18 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
19 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897)
20 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879)
21 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551)
22 at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
23 at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
24 at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
25 at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405)
26 at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
27 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
28 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
29 at com.ichinae.imis.MgrApplication.main(MgrApplication.java:20)
30 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
31 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
32 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
33 at java.lang.reflect.Method.invoke(Method.java:498)
34 at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
35 at org.springframework.boot.loader.Launcher.launch(Launcher.java:107)
36 at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
37 at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)
38 Caused 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
39 at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
40 at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:652)
41 ... 28 common frames omitted
42 Caused by: java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig
43 at org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration$LettucePoolingClientConfigurationBuilder.<init>(LettucePoolingClientConfiguration.java:94)
44 at org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration.builder(LettucePoolingClientConfiguration.java:51)
45 at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$PoolBuilderFactory.createBuilder(LettuceConnectionConfiguration.java:159)
46 at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.createBuilder(LettuceConnectionConfiguration.java:107)
47 at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.getLettuceClientConfiguration(LettuceConnectionConfiguration.java:92)
48 at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.redisConnectionFactory(LettuceConnectionConfiguration.java:74)
49 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
50 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
51 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
52 at java.lang.reflect.Method.invoke(Method.java:498)
53 at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
54 ... 29 common frames omitted
55 Caused by: java.lang.ClassNotFoundException: org.apache.commons.pool2.impl.GenericObjectPoolConfig
56 at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
57 at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
58 at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151)
59 at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
60 ... 40 common frames omitted像平常一样，copy 异样信息，粘贴的 google 搜一下，而后介绍的都是价格以 apache common pool2 的依赖，而后还有居然说重建一个我的项目到。。。（兄弟你搞笑的吧🙄）。
来说下这个异样的起因，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，解决的办法有两个：
-
因为启动时来加载器找不到 common-pool2 的相干类，那么就给它把相干类引入，增加依赖：
<dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool2</artifactId> </dependency> - 移除 lettuce.pool 的配置，如果你都用不到，或者都是复制过去的配置，就用默认的就能够，删除这个相干配置。
正文完
