java 找不到jar怎么办

java 找不到jar怎么办？找不到jar包的解决方法

1.右键项目-》属性-》Java bulid path-》jre System Library-》access rules-》resolution选择accessible，下面填上** 点击确定即可！！！

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2.在MyEclipse中编写Java代码时，用到了某个jar，import sun.misc.BASE64Decoder.*；可是MyEclipse提示：

Access restriction: The type *Decoder is not accessible due to restriction on required library C:\Program 
files\java\jre7\lib\rt.jar 
Access restriction : The constructor *BASE64Decoder() is not accessible due to restriction on required library C:\Program files\java\jre7\lib\rt.jar

解决方案1：

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。

解决方案2：

Windows -> Preferences -> Java -> Compiler -> Errors/Warnings -> 
Deprecated and trstricted API -> Forbidden reference (access rules): -> change to warning