sun.misc.BASE64Decoder 導入錯誤

import="sun.misc.BASE64Decoder"
出現錯誤提示爲：Access restriction: The type BASE64Decoder is not accessible due to restriction
on required library D:\ProgramFiles\MyEclipse\jre\lib\rt.jar
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安裝國外論壇的方法解決了，如下：
1. Open project properties.
2. Select Java Build Path node.
3. Select Libraries tab.
4. Remove JRE System Library.
5. Add Library JRE System Library.