Accidently deleted JRE from my Eclipse project

eclipse, java, project

Solution

Oh ofcourse, I missed the "Add library" Button.

Right click project->Properties->Java Build Path->Libraries Tab (JRE is missing!)->Add Library->Choose a library.

How the hell did I miss that.

Problem

I have opened a new Java project, wrote a lot of code, added a few external jars. I wanted to delete one external jar, accidently deleted the JRE library. Can't figure out how to re-add the JRE to the project.

Original source