Access restriction: The type SupplementaryCharacterData is not accessible due to restriction on requ

Access restriction: The type SupplementaryCharacterData is not accessible due to restriction on required library D:\Java\jdk1.7.0_71\jre\lib\rt.jar

解决方法：

①：Project -> Properties -> libraries， 先 remove 掉 JRE System Library，然后再 Add Library 重新加入。

②：Eclipse 默认把这些受访问限制的API设成了ERROR。只要把Windows-Preferences-Java-Complicer- Errors/Warnings里面的Deprecated and restricted API中的Forbidden references(access rules)选为Warning就可以编译通过。