java里的ClassNotFoundException

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【spring-security】nested exception is java.lang.ClassNotFoundException: org.springframework.security. 异常栈： Offending resource: class path resource [spring/applicationContext-security.xml]; nested exception is java.lang.ClassNotFoundException: org.springframework.security.web.FilterChainProxy a 阅读详情

1.Caused by: java.lang.ClassNotFoundException: org.springframework.security.oauth2.common.util.RandomValueStringGenerator

ClassNotFoundException是一个非运行时异常，且常常出现在项目启动时。它的意思简单明了，就是指项目启动时，或者执行某一个功能时，需要的Class找不到。这个错误非常常见，个人已经遇到过多次，但是每次的原因都不一定相同，

笔者这次遇到在使用springboot2.0的security相关配置时，启动时服务器报错，报错信息如下

Caused by: java.lang.NoClassDefFoundError: org/springframework/security/oauth2/common/util/RandomValueStringGenerator
	at org.cloudfoundry.identity.uaa.util.CachingPasswordEncoder.<init>(CachingPasswordEncoder.java:71)
	at com.sap.ngom.datamigration.configuration.WebSecurityConfig.passwordEncoder(WebSecurityConfig.java:45)
	at com.sap.ngom.datamigration.configuration.WebSecurityConfig$$EnhancerBySpringCGLIB$$7b6105f3.CGLIB$passwordEncoder$2(<generated>)
	at com.sap.ngom.datamigration.configuration.WebSecurityConfig$$EnhancerBySpringCGLIB$$7b6105f3$$FastClassBySpringCGLIB$$70546e9b.invoke(<generated>)
	at org.springframework.cglib.p