title: Eclipse running with just JRE
body: <p>I am using Eclipse to build and run java web application(with Tomcat).
  If i go to </p>
  
  <p><code>Window &gt; Preferences &gt; Java &gt; Installed JRE</code> </p>
  
  <p>i note that i have just one "<code>JRE</code>" configured. </p>
  
  <p>My question is :
  If i only have one JRE configured , how is it possible to Eclipse compile my application ? everything compile and runs smoothly but how is it possible ?
  <code>Jre</code> is just the <code>JVM</code> , does not have the compiler i guess</p>
  
  <p>Thanks in advance
  Best regards </p>