Error:(67, 51) java: diamond operator is not supported in -source 1.6 (use -source 7 or higher to enable diamond operator) : <p>I want to use <a href="https://github.com/guoguibing/librec" rel="nofollow">this</a> library, I cloned it and imported it into IntelliJ IDEA 14.0.3, with JDK 1.8.0_77, but when I want to run the main method I get this error:</p>

<pre><code>Error:(422, 50) java: diamond operator is not supported in -source 1.6
  (use -source 7 or higher to enable diamond operator)
</code></pre>

<p>what is going on here? how can I resolve it?</p>
