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。
报错： The type ByteInputStream is not accessible due to restriction on required library
原文：http://www.cnblogs.com/hyq0002013/p/5485441.html