title: Repeatable not found when using Spring 4 PropertySource
body: <p>we are using Spring 4.0.1.RELEASE in combination with jdk6 (this is fixed).
  Of course we have done the config in Java with usage of the <code>@PropertySource</code> annotation. This leads to an annoying warning message(s) when we compile the project with gradle:</p>
  
  <blockquote>
    <p>org\springframework\context\annotation\PropertySource.class(org\springframework\context\annotation:PropertySource.class):
    warning: Cannot find annotat ion method 'value()' in type
    'java.lang.annotation.Repeatable': class file for
    java.lang.annotation.Repeatable not found</p>
  </blockquote>
  
  <p>This is caused by the usage of not (in jdk6) existing Repeatable class and I am glad that it's just a warning.
  I love the clean output of gradle and this is just annoying because it may obfuscate other "real" warnings (like checkstyle...).</p>
  
  <p>Maybe anyone faced the same problem and got a (not so much hack) solution for this situation. I just want to see a clean output again.</p>