Eclipse 編譯錯誤 Access restriction:The type *** is no

Eclipse 編譯時報錯： 
        Access restriction:The type JPEGCodec is not accessible due to restriction on required library C:/Program Files/Java/jre6/lib/rt.jar 
        解決方法： 
        Project -> Properties -> libraries， 
        先 remove 掉 JRE System Library，而後再 Add Library 從新加入。 
原文連接：http://rxxluowei.iteye.com/blog/671893。