title: Add a Configurable Variable in a @Builder Class
body: <p>I have a @Builder class and one of the variables used in that class needs to be configurable. I've tried </p>
  
  <pre><code>@Value("${string.propertiesFile}")  
  private String stringValue;
  </code></pre>
  
  <p>where I'm inserting the a value defined in application.properties file into my <code>stringValue</code> variable. However, <code>stringValue</code> is always null. 
  How can I add a inject a literal value into my @Builder Class?</p>
  
  <p>Thanks so much!</p>