tomcat启动出错，求助
出现错误：
2007-2-13   14:54:17   org.apache.catalina.core.StandardContext   start
严重:   Error   listenerStart
2007-2-13   14:54:17   org.apache.catalina.core.StandardContext   start
严重:   Context   startup   failed   due   to   previous   errors

日志如下：

2007-02-13   14:54:17   StandardContext[/bbs]Exception   sending   context   destroyed   event   to   listener   instance   of   class   com.laoer.bbscs.web.servlet.SysListener
java.lang.NoClassDefFoundError:   org/springframework/core/CollectionFactory
at   org.springframework.beans.factory.support.AbstractBeanFactory. <init> (AbstractBeanFactory.java:118)
at   org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory. <init> (AbstractAutowireCapableBeanFactory.java:109)
at   org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory. <init> (AbstractAutowireCapableBeanFactory.java:118)
at   org.springframework.beans.factory.support.DefaultListableBeanFactory. <init> (DefaultListableBeanFactory.java:87)
at   org.springframework.context.support.AbstractXmlApplicationContext.createBeanFactory(AbstractXmlApplicationContext.java:91)
at   org.springframework.context.support.AbstractXmlApplicationContext.refreshBeanFactory(AbstractXmlApplicationContext.java:61)
at   org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:226)
at   org.springframework.context.support.ClassPathXmlApplicationContext. <init> (ClassPathXmlApplicationContext.java:58)
at   com.laoer.bbscs.sys.AppContext. <init> (AppContext.java:32)
at   com.laoer.bbscs.sys.AppContext.getInstance(AppContext.java:25)
at   com.laoer.bbscs.web.servlet.SysListener.contextDestroyed(SysListener.java:98)
at   org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:3868)
at   org.apache.catalina.core.StandardContext.stop(StandardContext.java:4531)
at   org.apache.catalina.core.StandardContext.start(StandardContext.java:4371)
at   org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823)
at   org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)
at   org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)
at   org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:277)
at   org.apache.catalina.core.StandardHost.install(StandardHost.java:832)
at   org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:701)
at   org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:432)
at   org.apache.catalina.startup.HostConfig.start(HostConfig.java:983)
at   org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:349)
at   org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at   org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)
at   org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
at   org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
at   org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
at   org.apache.catalina.core.StandardService.start(StandardService.java:480)
at   org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
at   org.apache.catalina.startup.Ca