jumperserver redis是干什么的 redis/clients/jedis/util/pool

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1.问题

近期遇到的一个异常问题如题所示，下面是完整的异常内容，原景重现：

PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'redisFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: redis/clients/jedis/util/Pool

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Disconnected from the target VM, address: '127.0.0.1:60159', transport: 'socket'
Exception in thread "main" java.lang.ExceptionInInitializerError
	at xxx.xxx.xxx.lifecycle_calc.source.KafkaSource.<init>(KafkaSource.java:14)
	at xxx.xxx.xxx.lifecycle_calc.LifecycleCalcStartup.main(LifecycleCalcStartup.java:31)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisHelper' defined in URL [file:/D:/Java/Workplace/fargo-crm-backend/fargo-lifecycle-calc/target/classes/config/spring-redis.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'redisFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: redis/clients/jedis/util/Pool
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1736)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1444)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
	at xxx.xxx.xxx.lifecycle_calc.factory.ApplicationContextFactory.<clinit>(ApplicationContextFactory.java:9)
	... 2 more
Caused by: org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'redisFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: redis/clients/jedis/util/Pool
	at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:122)
	at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:77)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1732)
	... 15 more

Process finished with exit code 1

异常提示：在方法调用redisFactory时，因找不到路径redis/clients/jedis/util/Pool的这个类，而导致的报错！

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2.原因

先说一下我的本地项目环境情况：spring-boot版本2.2.5.RELEASE，jedis使用的版本是2.9.3

2.1 分析一

既然提示找不到这个包，那么先看看我们的项目中，依赖包中是否能从指定路径找到这个类？？？

从路径结构，发现pool确实不是在jedis下面，而是在与jedis同级的util目录下，所以才报错找不到该类！！！

2.2 换依赖包

通过了解，得知jedis1.x版本与2.x版本有所差别，与springboot的版本有相对应的依赖关系！

spring-data-redis版本	jedis版本
2.1.x	2.9.x
2.2.x	3.x

于是把jedis版本换成了3.1.0版本：

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>3.1.0</version>
</dependency>

再看指定的目录是否有对应的类？果然，下面这个目录结构是可以找到的：

重新启动，本以为胜利的曙光就在眼前了！怎料，控制台出现如下显示：

但是程序并没有退出提示，说明此时程序已经启动了，只是日志没有正常打印出来而已！

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3.解决

通过上面的分析处理，其实在上述V2.2换依赖包时，我们主要的问题已经解决啦（也就是如题的问题）！！！但是，控制台却没有日志打印，这多少让人觉得好像还是没能正常启动~~~

所以，我们需要再看看日志为啥子没有打印出来！因为主要问题已经找出来了，所以这个日志为啥没打印的问题，我就直接给出我的解决方式吧 ！

通过查看包依赖问题，我们发现是依赖里缺少了log日志的包依赖，导致日志没有正常打印！所以加上之后，包依赖情况如下：

<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-redis</artifactId>
</dependency>
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>3.1.0</version>
</dependency>
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
</dependency>

其实上述依赖，改成如下情况，也是ok的：

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
	<groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
</dependency>

因为spring-boot-starter-data-redis中已经包含了相对应的依赖包了，所以只是依赖包的结构不同而已！！！