Access restriction: The type BASE64Decoder is not accessible due to restriction on required

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sun.misc.BASE64Encoder找不到jar包的解决方法

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

解决办法：

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

在Eclipse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
搞不懂是为什么，最后在http://forums.dzone.com/eclipse/384-access-restriction- problems.html找到答案，只需要在project 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。但是我仍然很疑惑是为什么。。。
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还有人说是按照下面的解决办法，但是个人觉得这样不是很靠谱……
Windows -> Preferences -> Java -> Compiler -> Errors/Warnings ->
Deprecated and trstricted API -> Forbidden reference (access rules): -> change to warning

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