Eclipse项目中sun.misc.BASE64Encoder找不到jar包的解决方法

问题描述

        在MyEclipse中编写Java代码时，用到了BASE64Decoder，import sun.misc.BASE64Decoder；可是Eclipse提示：
Access restriction: The type BASE64Decoder is not accessible due to restriction on required library C:\Program\files\java\jre6\lib\rt.jar
Access restriction : The constructor BASE64Decoder() is not accessible due to restriction on required library C:\Program files\java\jre6\lib\rt.jar

解决办法

        在项目的Build path中先移除JRE System Library，再添加库JRE System Library，重新编译后就一切正常了。