design-patterns: The package com.sun.java.swing.plaf.windows is not accessible

jeudi 11 avril 2019

I have open an Java project and the error is

Multiple markers at this line
    - The import java.io is never used
    - The package com.sun.java.swing.plaf.windows is not accessible

So why it happend?

My Java version is:

java version "12" 2019-03-19 Java(TM) SE Runtime Environment (build 12+33) Java HotSpot(TM) 64-Bit Server VM (build 12+33, mixed mode, sharing)

design-patterns