Redis配置问题——细节问题

缺乏、安全感 2021-12-14 18:13 383阅读 0赞

## 前述 ##

这几天在学习Redis的相关内容，在用spring进行整合配置时，出现了一些问题，很无脑的问题，在ApplicationContext.xml配置文件时，将类名首字母小写导致不断出现错误，着实有些无脑了。

## 错误信息 ##

org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.springframework.data.redis.serializer.jdkSerializationRedisSerializer] for bean with name 'jdkSerializationRedisSerializer' defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: org.springframework.data.redis.serializer.jdkSerializationRedisSerializer
    	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1328)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:622)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:591)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1397)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:968)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:742)
    	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    	at step_2.Demo.main(Demo.java:14)
    Caused by: java.lang.ClassNotFoundException: org.springframework.data.redis.serializer.jdkSerializationRedisSerializer
    	at java.net.URLClassLoader.findClass(Unknown Source)
    	at java.lang.ClassLoader.loadClass(Unknown Source)
    	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    	at java.lang.ClassLoader.loadClass(Unknown Source)
    	at org.springframework.util.ClassUtils.forName(ClassUtils.java:249)
    	at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:395)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1349)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1320)
    	... 10 more
    
    Exception in thread "main" org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.springframework.data.redis.serializer.jdkSerializationRedisSerializer] for bean with name 'jdkSerializationRedisSerializer' defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: org.springframework.data.redis.serializer.jdkSerializationRedisSerializer
    	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1328)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:622)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:591)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1397)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:968)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:742)
    	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    	at step_2.Demo.main(Demo.java:14)
    Caused by: java.lang.ClassNotFoundException: org.springframework.data.redis.serializer.jdkSerializationRedisSerializer
    	at java.net.URLClassLoader.findClass(Unknown Source)
    	at java.lang.ClassLoader.loadClass(Unknown Source)
    	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    	at java.lang.ClassLoader.loadClass(Unknown Source)
    	at org.springframework.util.ClassUtils.forName(ClassUtils.java:249)
    	at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:395)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1349)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1320)
    	... 10 more

出现Caused by: java.lang.**ClassNotFoundException**: org.springframework.data.redis.serializer.**jdkSerializationRedisSerializer**

而我的applicationContext.xml配置文件是这样的  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxOTk5NDU1_size_16_color_FFFFFF_t_70]  
再我将jdkSerializationRedisSerializer改为JdkSerializationRedisSerializer后错误消失。

***总结：***  
**如果出现错误提示ClassNotFoundException，表明类未加载，这时我们需要去看包下是否存在该类，若存在我们需要去看一下配置文件中的类名及路径是否存在问题**。**（出现大小写错误着实有点无脑操作。。）**

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