title: Concurrent access to a utility static method
body: <p>We have a scenario in which several threads call a static method like the following one:</p>
  
  <pre><code>public static boolean isEmpty(final String s) {
      return s == null || s.length() &lt; 1;
  }
  </code></pre>
  
  <p>Could it cause a problem of inconsistence if 100 threads call it?</p>