java.lang.NoClassDefFoundError: org/apache/commons/collections/map/LRUMap

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Caused by: java.lang.NoClassDefFoundError: org/apache/commons/collections/map/LRUMap
at org.hibernate.util.SimpleMRUCache.init(SimpleMRUCache.java:71)
at org.hibernate.util.SimpleMRUCache.<init>(SimpleMRUCache.java:55)
at org.hibernate.util.SimpleMRUCache.<init>(SimpleMRUCache.java:50)
at org.hibernate.engine.query.QueryPlanCache.<init>(QueryPlanCache.java:69)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:189)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1385)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:954)
at org.springframework.orm.hibernate3.SessionFactoryBuilderSupport.newSessionFactory(SessionFactoryBuilderSupport.java:607)
at org.springframework.orm.hibernate3.SessionFactoryBuilderSupport.doBuildSessionFactory(SessionFactoryBuilderSupport.java:467)
at org.springframework.orm.hibernate3.SessionFactoryBeanDelegate.afterPropertiesSet(SessionFactoryBeanDelegate.java:110)
at org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean.afterPropertiesSet(AnnotationSessionFactoryBean.java:121)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1479)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1417)
... 27 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.map.LRUMap
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)

... 40 more

今天在整合SSH的时候遇到了这个错误，自己查了很久的原因，也在网上查了相应的资料，功夫不负有心人，总算让我找到了：把commons-collections-2.1.1.jar换成commons-collections-3.1.jar问题解决了。