title: Can't find resource for bundle java.util
body: <p>I have tow properties files :</p>
  
  <p>config-app.properties</p>
  
  <p>config-dev.properties</p>
  
  <p>and i try to read from the fist witch read also from the second like that :</p>
  
  <p><strong><em>the java code:</em></strong></p>
  
  <pre><code>String smtpHostName = ResourceBundle.getBundle("config-app").getString("smtp.host.name");
  </code></pre>
  
  <p><strong><em>config-app.properties</em></strong></p>
  
  <pre><code>smtp.host.name  =${smtp.host.name.env}
  </code></pre>
  
  <p><strong><em>config-dev.properties</em></strong></p>
  
  <pre><code>smtp.host.name.env  =smtp.gmail.com
  </code></pre>
  
  <p>but i have that message :</p>
  
  <pre><code>Can't find resource for bundle java.util.PropertyResourceBundle
  </code></pre>
  
  <p>Edit: Code formatting.</p>