title: "SecurityException: sealing violation" when starting Derby connection
body: <p>I need do start the derby server from my java application using "<code>org.apache.derby.drda.NetworkServerControl</code>" class.<br>
  When I try to start the server it throws an exception.</p>
  
  <p>Code:  </p>
  
  <pre><code>NetworkServerControl server = null; 
  server=new NetworkServerControl(InetAddress.getLocalHost(),1527,"user","123")
  server.start(new PrintWriter(System.out));
  </code></pre>
  
  <p>Error:  </p>
  
  <pre><code>Caused by: java.lang.SecurityException: sealing violation: package org.apache.derby.impl.store.raw.xact is sealed
  </code></pre>
  
  <p>Can anybody tell me the reason for this error?</p>