Eclipse 编译错误 Access restriction:The type *** is no

Eclipse 编译时报错： 
        Access restriction:The type JPEGCodec is not accessible due to restriction on required library C:/Program Files/Java/jre6/lib/rt.jar 
        解决方法： 
        Project -> Properties -> libraries， 
        先 remove 掉 JRE System Library，而后再 Add Library 从新加入。 
原文连接：http://rxxluowei.iteye.com/blog/671893。