public Object invoke(Invocation mi) throws Exception 
{
      // Get context
      MessageDrivenContainer mdc = (MessageDrivenContainer) container;
      InstancePool pool = mdc.getInstancePool();
      EnterpriseContext ctx = null;
      try
      {
         ctx = pool.get();
      }
      catch (EJBException e)
      {
         throw e;
      }
      catch (Exception e)
      {
         throw new EJBException("Unable to get an instance from the pool", e);
      }
      // Set the current security information
      ctx.setPrincipal(mi.getPrincipal());
      // Use this context
      mi.setEnterpriseContext(ctx);
      // Set the JACC EnterpriseBean PolicyContextHandler data
      EnterpriseBeanPolicyContextHandler.setEnterpriseBean(ctx.getInstance());
      if (ejbTimeout.equals(mi.getMethod()))
         AllowedOperationsAssociation.pushInMethodFlag(IN_EJB_TIMEOUT);
      else
         AllowedOperationsAssociation.pushInMethodFlag(IN_BUSINESS_METHOD);
      // There is no need for synchronization since the instance is always
      // fresh also there should never be a tx associated with the instance.
      try
      {
         // Invoke through interceptors
         Object obj = getNext().invoke(mi);
         return obj;
      }
      catch (RuntimeException e) // Instance will be GC'ed at MI return
      {
         mi.setEnterpriseContext(null);
         throw e;
      }
      catch (RemoteException e) // Instance will be GC'ed at MI return
      {
         mi.setEnterpriseContext(null);
         throw e;
      }
      catch (Error e) // Instance will be GC'ed at MI return
      {
         mi.setEnterpriseContext(null);
         throw e;
      }
      finally
      {
         AllowedOperationsAssociation.popInMethodFlag();
         EnterpriseBeanPolicyContextHandler.setEnterpriseBean(null);
         // Return context
         if (mi.getEnterpriseContext() != null)
         {
            pool.free((EnterpriseContext) mi.getEnterpriseContext());
         }
         else
         {
            pool.discard(ctx);
         }
      }
}

 public Object invokeHome(Invocation mi) throws Exception 
{
      try
      {
         ejbTimeout = TimedObject.class.getMethod("ejbTimeout", new Class[]{Timer.class});
      }
      catch (Exception e)
      {
         throw new ExceptionInInitializerError(e);
      }
      throw new Error("Not valid for MessageDriven beans");
}

Message driven beans do not have homes.