Bundle update in karaf leads to frozen class exception of registered listener class

Robert Varga asked me to fill for this. Refer: https://lists.opendaylight.org/pipermail/controller-dev/2014-November/007428.html

I get a frozen class RuntimeExeception (full exeption attached) if i
do a bundle update in karaf. The problem only occurs if i had
registered a notificationListener in my application.

Steps to Reproduce (code attached):
1.) In Activator register a Listener

• Registration this.myLoggingEventListenerRegistration = notificationService.registerNotificationListener(new MyLoggingEventListener());
• MyLoggingEventListener implements SalFlowListener
  2.) mvn clean install on project while bundle:watch * in karaf shell to update the bundle

Actual Results:

The first time i start my bundle in helium karaf-shell everything works
as aspected. I get the flowAdded notification, even if i stop karaf via
logout, delete the data folder and restart karaf, my bundle works for
the first time.

But if i change something in myapp (add log message) and do a mvn clean
install while bundle:watch in karaf, i get a java.lang.RuntimeException:
java.lang.RuntimeException:
org.opendaylight.openflowplugin.mytest.MyLoggingEventListener$$Broker$ListenerInvoker:
frozen class (cannot edit).

I used the ofplugin distribution for this test
(https://git.opendaylight.org/gerrit/p/openflowplugin.git, did checkout
stable/helium and a mvn clean install) but i also get the same error
when i use the karaf distribution from integration repo and deploy my
bundle via the deploy folder.

Expected Results:
For testing it would be nice if i do not have to resart my karaf distribution if i use notifications.

Build Date & Hardware
Fresh git clone of repos, Build 2014-11-25 on Ubuntu 14.04.1 LTS