title: Why does Eclipse complain that the project specifies compiler compliance 1.8 but a JRE 11 is used?
body: <p>I set an Eclipse project compiler compliance to 1.8 because I want to generate jar files that can be executed in computers with JRE 8 installs.</p>
  
  <p>However, in my development computer I only have JRE 11 installed. I assumed this to be ok because I expected a JRE 11 to be able to execute 1.8 files and above.</p>
  
  <p>However, Eclipse produces a warning about this (which I cannot find a way to disable), and the compiler preferences dialog says "When selecting 1.8 compliance, make sure to have a compatible JRE installed and activated (currently 11)", which makes is sound like a JRE 11 is not compatible with 1.8. Is that really the case?</p>
  
  <p>What wrong assumptions I am making here, exactly?</p>
  
  <p>Also, do I really need to have a JRE 8 installed in order to produce JRE 8-compatible code?</p>