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Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream

小胖教我的
eclipse開發時, 用本機無法寄mail
當出現下面exception時
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream


C:\Program Files\MyEclipse 6.5\myeclipse\eclipse\plugins\com.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806\data\libraryset\EE_5\javaee.jar

把javaee.jar裡的
javax\activation\
javax\mail\
刪掉

clean eclipse  , build eclipse