title: Upgrade Eclipse java compiler
body: <p>I started using Ant, that ships with Eclipse. It annoys me, that I get hundreds of warnings in the lines of:</p>
  
  <blockquote>
    <p>[javac] warning:
    java\io\BufferedInputStream.class(java\io:BufferedInputStream.class):
    major version 51 is newer than 50, the
    highest major version supported by
    this compiler.<br>
        [javac] It is recommended that the compiler be upgraded.</p>
  </blockquote>
  
  <p>How do I upgrade compiler?</p>