springboot整合redis后出現: Unsatisfied dependency expressed through field 'redisTemplate';

異常:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'redisController': 
Unsatisfied dependency expressed through field 'redisTemplate'; 
nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'redisTemplate' defined in class path resource 
[org/springframework/boot/autoconfigure/data/redis/RedisAutoConfiguration.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
    

解決方案:

因為springboot2.x以后用得是lettuce,添加連接池依賴

     <!-- lettuce pool -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>