Description Resource Path Location Type Unbound classpath container: 'JRE System Library [JavaSE-11]' in project 'FirstProj' FirstProj Build path Build Path Problem

Right click on Project - build path - left click on JRE - Remove - Add Library - JRE System and choose that's available.

Right click on Project - build path - left click on JRE - Remove - Add Library - JRE System and choose that's available