There is no good reason to create a new object to not do anything with it. Most of the time, this is due to a missing piece of code and so could lead to an unexpected behavior in production.

<h2>Noncompliant Code Example</h2>
<pre>
if (x &lt; 0)
  new IllegalArgumentException("x must be nonnegative");
</pre>

<h2>Compliant Solution</h2>
<pre>
if (x &lt; 0)
  throw new IllegalArgumentException("x must be nonnegative");
</pre>