Bonjour,
je suis debutant en spring,
j ai rencontré un probleme avec l'execution d'un application voila l'erreur:

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org.springframework.web.context.ContextLoader [ContainerBackgroundProcessor[StandardEngine[Catalina]]] Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactoryPER' defined in URL [jar:file:/D:/FatimaZahra/WorkspacePerNew/.metadata/.plugins/org.eclipse.wst.server.core/tmp2/wtpwebapps/perWeb/WEB-INF/lib/perDao-2.0.jar!/applicationContext-datasource.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/collections/SequencedHashMap
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1337)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:221)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:423)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:729)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:381)
	at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
	at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3461)
	at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1361)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1653)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1662)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1662)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1642)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/collections/SequencedHashMap
	at org.hibernate.mapping.Table.<init>(Table.java:33)
	at org.hibernate.cfg.Mappings.addTable(Mappings.java:165)
	at org.hibernate.cfg.annotations.TableBinder.fillTable(TableBinder.java:124)
	at org.hibernate.cfg.annotations.EntityBinder.bindTable(EntityBinder.java:330)
	at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:536)
	at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:452)
	at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:268)
	at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1121)
	at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:673)
	at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1368)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1334)
	... 25 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.SequencedHashMap
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
	... 37 more