title: @RequestParam defaultvalue does not accept enum value as a default value
body: <p>I am using spring rest controller.</p>
  
  <p>Here is the code.</p>
  
  <pre><code>@RequestParam(value = "status", required = false, defaultValue = StatusEnum.STATUS.toString())
  </code></pre>
  
  <p>If i use enum as a defaultValue i am getting The value for annotation attribute RequestParam.defaultValue must be a constant expression.</p>
  
  <p>As per my understanding it should accept enum as a default value.</p>
  
  <p>Please advice.</p>