title: Java: dynamic properties
body: <p>Ladies &amp; Gentlemen,</p>
  
  <p>I´m new to Java, forgive me if it´s obvious, but I haven´t found much about it.</p>
  
  <p>I´d like to create dynamic properties (variables) for a class at runtime (define an object that can be altered at runtime by adding or changing properties and methods).</p>
  
  <hr>
  
  <p>Reason: I want to store a data model in GAE that can be extended dynamically after compilation  of the app (yes, the DataStore allows that). What properties should be added are stored in the DataStore as well (It´s like using Robots to built Robots...funny).</p>
  
  <p>Python allows me to add properties at Runtime. Groovy seems to allow that, too. The only thing  in the "pure" Java world indicating in that direction seems to be "Dynamic Proxies".</p>
  
  <p>But I couldn´t figure out yet if they do the trick.</p>