How to use

MarshalInstanceOutput

in

net.jini.io

/**
 * 
 * @param obj Object to be marshaled.
 * @param context
 * @param factory MarshalFactory used to create MarshalIntstanceOutput
 * @param bout ByteArrayOutputStream to write object serial form.
 * @param lout ByteArrayOutputStream to write code-base annotation to.
 * @return byte array of location.
 * @throws IOException 
 */
private static byte[] writeOutRetLocAnnotation(Object obj, Collection context, MarshalFactory factory,
  ByteArrayOutputStream bout, ByteArrayOutputStream lout) throws IOException
{
if (context == null) throw new NullPointerException();
if (factory == null) throw new NullPointerException();
MarshalInstanceOutput out = null;
try {
  out = factory.createMarshalOutput(bout, lout, context);
  out.writeObject(obj);
  out.flush();
  // locBytes is null if no annotations
  return out.hadAnnotations() ? lout.toByteArray() : null;
} finally {
  try {
  if (out != null) out.close();
  } catch (IOException e){} // Ignore
}
}