Hi i am recently converting from aSmack 3.X to aSmack 4.0. In aSmack 4.0 it seems that the
Those methods where moved out of smack-core into smack-extensions with Smack 4. You now need to use
JivePropertiesManager.getProperty(Packet, String) and
JivePropertiesManager.addProperty(Packet, String) to add and get those.
More info about the API changes from Smack 3 to Smack 4 can be found at the official "Smack 4.0 Readme and Upgrade Guide".