title: Eclipse is not showing "Run as Java Application" option. Only shows "Run Configurations"
body: <p>My friend and myself are working on a java assignment and we are using github for version control.<br>
  We have a main file which has the correct syntax:<br>
     <code>public static void main(String args[]) { 
    //code 
  }</code><br>
  Yesterday, I was able to run the main file as a java application. But today my friend made changes to some other files and I updated my repository. Now however I am unable to run the main file even though no changes have been made to it.   </p>
  
  <p>What can I do? Even the syntax highlighting is gone.<br>
  I am using Eclipse Version: Neon.3 Release (4.6.3)</p>