title: Modify a class definition's annotation string parameter at runtime
body: <p>Imagine there is a class:</p>
  
  <pre><code>@Something(someProperty = "some value")
  public class Foobar {
      //...
  }
  </code></pre>
  
  <p>Which is already compiled (I cannot control the source), and is part of the classpath when the jvm starts up.  I would like to be able to change "some value" to something else at runtime, such that any reflection thereafter would have my <em>new value</em> instead of the default "some value".</p>
  
  <p>Is this possible?  If so, how?</p>