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java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream java.lang.noclassdeffounderror http://hi.baidu.com/jonw000/blog/item/d38221eed966c818fdfa3cb5.html
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream
如果你用myEclipse进行开发的话,运行时可能会出现以下的错误:
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream
原因是jar包版本不统一,解决方法如下:

删除Java EE 5 Libraries/javaee.jar/mail里的包有东西.

具体方法如下:
用rar打开X:/Program Files/MyEclipse 6.0/myeclipse/eclipse/plugins/com.genuitec.eclipse.j2eedt.core_6.0.1.zmyeclipse601200710/data/libraryset/EE_5/javaee.jar
,然后删除mail,一切就ok了.
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory java.lang.noclassdeffounderror: org/apache/commons/logging/logfactory
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
缺少两个jar包
log4j.jar
common-logging.jar
加到lib里面就OK了
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