Eclipse 编译错误 Access restriction:The type *** is not accessible due to restriction on... 解决方案

Eclipse 编译错误 Access restriction:The type *** is notaccessible due to restriction on... 解决方案

        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，然后再 Add Library 重新加入。