java.lang.NoClassDefFoundError解决

打开电脑发现应用启动有问题。提示:Java . lang . noclasdefaunderror:javax/transaction/transaction manager。所以我谷歌了一下，结果发现jta.jar不见了。奇怪，以前还好好的。今天怎么少了？Examda提示:Eclipse有问题吗？
jta.jar下载地址:
1、http://java.sun.com/products/jta/download类文件，然后自己打包成jar文件，或者直接修改后缀zip为jar
2、 http://download.csdn.net/source/337356 CSDN下载
具体错误信息如下:
原因by:
Java . lang . noclassdeffundererror:javax/transaction/transaction manager
at Java . lang . class . getdeclaredmethods 0(Native Method)
at Java . lang . class . privategetdeclaredmethods(class . Java:2365)
at Java . lang . class . getdeclaredmethods(class . Java:1763)
在org . spring framework . beans . factory . support . abstractbeanfactory . get bean(abstractbeanfactory . Java:242)
在org . spring framework . beans . factory . support . abstractbeanfactory . get bean(abstractbeanfactory . Java:156)
在org . spring framework . beans . factory . support . bean definitionvalueresolver . resolver reference(bean definitionvalueresolver . Java:246)
在org . spring framework . beans . factory . support . bean definition