title: How to find cause of exception if type is Throwable
body: <p>Give this method here:</p>
  
  <pre><code>public SomeClass(Throwable stackTrace) {
      super();
      this.stackTrace = stackTrace;
  }
  </code></pre>
  
  <p>How can I find out what class type <code>stacktrace</code> originally was before being passed in?</p>