在项目中用到这两个Jar包，但是程序报错。
Access restriction: The type BASE64Decoder is not accessible due to restriction on required library C:Program
filesjavajre7lib
t.jar
Access restriction : The constructor BASE64Decoder() is not accessible due to restriction on required library C:Program filesjavajre7lib
t.jar
解决方法：
右键项目 -> Build Path -> Configure Build Path -> Libraries -> 选中 JRE System Library -> Remove
接着： Add Library -> JRE System Library 重新编译后，就没有问题了。