用eclipse写java程序时，提示：Access restriction: The type JPanel is not accessible due to restriction on required library C:\Program Files (x86)\Java\jre1.8.0_131\lib\rt.jar该怎么办呀？

用eclipse写java程序时，提示：Access restriction: The type JPanel is not accessible due to restriction on required library C:\Program Files (x86)\Java\jre1.8.0131\lib\rt.jar该怎么办呀？
我也有通过Project->Properties->Java build Path->Libraries->更改构建路径为rt.jar可是为什么还是会出现错误提示呢？程序调试又没问题...

更改路径：

先remove掉JRE System Library，然后再Add Library重新加入?
可以试试