Access restriction: The type 'FtpProtocolException' is not API (restriction on required library 'C:\Program Files\Java\jdk1.8.0_171\jre\lib\rt.jar')

报错：
Access restriction: The type 'FtpProtocolException' is not API (restriction on required library 'C:\Program Files\Java\jdk1.8.0_171\jre\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。

具体移除、加入：

$Access restriction: The type 'FtpProtocolException' is not API (restriction on required library 'C:\Program Files\Java\jdk1.8.0_171\jre\lib\rt.jar')$

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