Error creating bean with name 'stringRedisTemplate' defined in...

小渣渣

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'stringRedisTemplate' defined in class path resource [org/springframework/boot/autoconfigure/data/redis/RedisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'stringRedisTemplate' 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

环境：

spring-boot-starter-data-redis 2.1.1.RELEASE版本

spring-boot-starter-parent 2.1.1.RELEASE版本

jdk 1.8

POM.XML配置

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启动项目报错，错误原因分析：

springboot 2.X 版本使用lettuce连接池来替换jedis。Lettuce和Jedis都是连接Redis Server的客户端程序，Jedis在实现上是直连redis server，多线程环境下非线程安全，除非使用连接池，为每个Jedis势力增加物理连接。Lettuce基于Netty的势力连接，可以再多个线程间并发访问，且线程安全，满足多线程环境下的并发访问，同时它是可伸缩的设计，一个连接实例不够的情况也可以按需增加连接实例。

解决办法：

springboot2.X默认使用lettuce连接池，需要引入commons-pool2

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题外话，如果出现如下错误：

Consider defining a bean of type 'org.springframework.data.redis.core.RedisTemplate' in your configuration.

The injection point has the following annotations:
        - @org.springframework.beans.factory.annotation.Autowired(required=true)

请参考：

SpringBoot中注入RedisTemplate实例异常解决
https://www.itsvse.com/thread-7224-1-1.html
(出处: 架构师_程序员)