早上上班開啟電腦，發現應用啟動出問題了，提示：java.lang.NoClassDefFoundError: javax/transaction/TransactionManager， 於是google了一下，原來是少了jta.jar。奇怪，原來好好的，今天怎麼少了呢？ 是不是我Eclipse出問題了。

jta.jar 下載地址:

具體出錯資訊如下：

1. Caused by: 
2. java.lang.NoClassDefFoundError: javax/transaction/TransactionManager
3.     at java.lang.Class.getDeclaredMethods0(Native Method)
4.     at java.lang.Class.privateGetDeclaredMethods(Class.java:2365)
5.     at java.lang.Class.getDeclaredMethods(Class.java:1763)
6.     at java.beans.Introspector$1.run(Introspector.java:1265)
7.     at java.security.AccessController.doPrivileged(Native Method)
8.     at java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:
   1263)
9.     at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1129)
10.     at java.beans.Introspector.getBeanInfo(Introspector.java:387)
11.     at java.beans.Introspector.getBeanInfo(Introspector.java:159)
12.     at org.springframework.beans.CachedIntrospectionResults.<init>(CachedIntrospectionResults.java:
    142)
13.     at org.springframework.beans.CachedIntrospectionResults.forClass(CachedIntrospectionResults.java:83)
14.     at org.springframework.beans.BeanWrapperImpl.setIntrospectionClass(BeanWrapperImpl.java:239)
15.     at org.springframework.beans.BeanWrapperImpl.setWrappedInstance(BeanWrapperImpl.java:197)
16.     at org.springframework.beans.BeanWrapperImpl.setWrappedInstance(BeanWrapperImpl.java:180)
17.     at org.springframework.beans.BeanWrapperImpl.<init>(BeanWrapperImpl.java:133)
18.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:535)
19.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:375)
20.     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:245)
21.     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:141)
22.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:242)
23.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:156)
24.     at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:246)
25.     at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:128)
26.     at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:332)
27.     at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:97)
28.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:578)
29.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:371)
30.     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:245)
31.     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:141)
32.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:242)
33.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:156)
34.     at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:246)
35.     at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:128)
36.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:850)
37.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:624)
38.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:411)
39.     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:245)
40.     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:141)
41.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:242)
42.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:156)
43.     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:304)
44.     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:348)
45.     at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:156)
46.     at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:246)
47.     at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:184)
48.     at org.springframework.web.context.ContextLoaderServlet.init(ContextLoaderServlet.java:83)
49.     at javax.servlet.GenericServlet.init(GenericServlet.java:211)
50.     at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1105)
51.     at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:932)
52.     at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3951)
53.     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4225)
54.     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
55.     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
56.     at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
57.     at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:608)
58.     at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:535)
59.     at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:470)
60.     at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)
61.     at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)
62.     at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
63.     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)
64.     at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
65.     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
66.     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
67.     at org.apache.catalina.core.StandardService.start(StandardService.java:450)
68.     at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
69.     at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
70.     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
71.     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
72.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
73.     at java.lang.reflect.Method.invoke(Method.java:585)
74.     at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
75.     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)