打开电脑，发现应用启动出问题了，提示：java.lang.NoClassDefFoundError: javax/transaction/TransactionManager， 于是google了一下，原来是少了jta.jar。奇怪，原来好好的，今天怎么少了呢？Examda提示: 是不是Eclipse出问题了。
　　jta.jar 下载地址:
　　1,http://java.sun.com/products/jta/ 下载类文件 Class Files,然后自己打包成jar文件，或者直接修改后缀名zip为jar
　　2,CSDN下载 http://download.csdn.net/source/337356
　　具体出错信息如下：
　　Caused by:
　　java.lang.NoClassDefFoundError: javax/transaction/TransactionManager
　　at java.lang.Class.getDeclaredMethods0(Native Method)
　　at java.lang.Class.privateGetDeclaredMethods(Class.java:2365)
　　at java.lang.Class.getDeclaredMethods(Class.java:1763)
　　at java.beans.Introspector$1.run(Introspector.java:1265)
　　at java.security.AccessController.doPrivileged(Native Method)
　　at java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1263)
　　at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1129)
　　at java.beans.Introspector.getBeanInfo(Introspector.java:387)
　　at java.beans.Introspector.getBeanInfo(Introspector.java:159)
　　at org.springframework.beans.CachedIntrospectionResults.(CachedIntrospectionResults.java:142)
　　at org.springframework.beans.CachedIntrospectionResults.forClass(CachedIntrospectionResults.java:83)
　　at org.springframework.beans.BeanWrapperImpl.setIntrospectionClass(BeanWrapperImpl.java:239)
　　at org.springframework.beans.BeanWrapperImpl.setWrappedInstance(BeanWrapperImpl.java:197)
　　at org.springframework.beans.BeanWrapperImpl.setWrappedInstance(BeanWrapperImpl.java:180)
　　at org.springframework.beans.BeanWrapperImpl.(BeanWrapperImpl.java:133)
　　at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:535)
　　at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:375)
　　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.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:332)
　　at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:97)
　　at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:578)
　　at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:371)
　　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:850)
　　at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:624)
　　at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:411)
　　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:304)
　　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.ContextLoaderServlet.init(ContextLoaderServlet.java:83)
　　at javax.servlet.GenericServlet.init(GenericServlet.java:211)
　　at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1105)
　　at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:932)
　　at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3951)
　　at org.apache.catalina.core.StandardContext.start(StandardContext.java:4225)
　　at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
　　at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
　　at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
　　at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:608)
　　at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:535)
　　at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:470)
　　at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)
　　at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)
　　at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
　　at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)
　　at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
　　at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
　　at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
　　at org.apache.catalina.core.StandardService.start(StandardService.java:450)
　　at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
　　at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
　　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:585)
　　at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
　　at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)