我是如何在2年内逆袭成为BAT年薪40W的资深开发工程师的？   

2012-04-18 15:05:44,937 ERROR [org.springframework.web.context.ContextLoader] - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name '/emailm' defined in file [D:\workspace\v1.3_update\WebRoot\WEB-INF\classes\applicationContext-actions.xml]: Cannot resolve reference to bean 'Emailutil' while setting bean property 'emaUtil'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'Emailutil' defined in file [D:\workspace\v1.3_update\WebRoot\WEB-INF\classes\applicationContext-services.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: javax/mail/Authenticator
Caused by: 
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'Emailutil' defined in file [D:\workspace\v1.3_update\WebRoot\WEB-INF\classes\applicationContext-services.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: javax/mail/Authenticator
Caused by: 
java.lang.NoClassDefFoundError: javax/mail/Authenticator
	at java.lang.Class.getDeclaredConstructors0(Native Method)
	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
	at java.lang.Class.getConstructor0(Class.java:2699)
	at java.lang.Class.getDeclaredConstructor(Class.java:1985)
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:59)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:52)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:639)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:625)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:245)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:141)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:242)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:156)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:246)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:128)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:955)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:729)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:416)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:245)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:141)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:242)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:156)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:290)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:348)
	at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:156)
	at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:246)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:184)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3843)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4350)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
	at org.apache.catalina.core.StandardService.start(StandardService.java:516)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: java.lang.ClassNotFoundException: javax.mail.Authenticator
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1360)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)
	... 43 more
2012-4-18 15:05:44 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name '/emailm' defined in file [D:\workspace\v1.3_update\WebRoot\WEB-INF\classes\applicationContext-actions.xml]: Cannot resolve reference to bean 'Emailutil' while setting bean property 'emaUtil'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'Emailutil' defined in file [D:\workspace\v1.3_update\WebRoot\WEB-INF\classes\applicationContext-services.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: javax/mail/Authenticator
Caused by: org.springframework.beans.factory.BeanCreationException:

找了很久不知道是什么错了，望各位大神搭救一把。