Redis 连接错误/连接池配置错误

【说明】：项目采用Redia在redis方面采用RedisTemplate进行方法调用，在配置中采用RedisConnectionFactory和redis连接池

【错误现象】

项目启动不开

Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled.
2020-11-11 17:53:58.782 ERROR 18680 — [ main] o.s.boot.SpringApplication : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘userController’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘userServiceImpl’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘redisService’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘redisTemplate’ defined in class path resource [com/neusiri/config/RedisConfig.class]: Unsatisfied dependency expressed through method ‘redisTemplate’ parameter 0; nested exception is 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
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:324) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]

【错误分析思路】

在通过错误报告中可以一点一点寻找，开始错误提示为Controller出错，但是查看错误原因[往后找]其实并不是在controller层，而是在RedisConfig.class中，再往下看错误可能出现在RedisConnectionFactory中，因此推断可能是在配置文件中redis的配置错误，但是检查后发现配置文件中并没有错误，因此推断问题可能出现在pom文件中依赖没有引入，通过问题可能出现在RedisConnectionFactory中推断一定是连接上出了问题因此查看连接的依赖。
最后发现未引入连接池依赖，因为在配置文件中redis是通过连接池配置的，因此没引入连接池redis配置不成功。

【解决方法】

引入连接池依赖

        <!--redis依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <!--连接池依赖-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>

【redis依赖】-pom文件

【配置文件中redis配置信息】

#配置redis信息
#redis服务器地址
spring.redis.host=localhost
#redis服务器端口
spring.redis.port=6379
#连接池最大连接数（使用负数表示没有限制）默认8
spring.redis.lettuce.pool.max-active=100
#连接池最大阻塞等待时间(使用负值表示没有限制)默认-1
spring.redis.lettuce.pool.max-wait=PT10S
#连接池最大空闲连接数（使用负值表示没有限制）默认8
spring.redis.lettuce.pool.max-idle=30
#连接池最小空闲连接数（使用负值表示没有限制）默认0
spring.redis.lettuce.pool.min-idle=1
#连接超时时间
spring.redis.timeout=PT10S

【注】刷新Maven=>重启