I tried to translate your example plugin and finally put it to work with Spark 2.5.8. As I start modifying the code at the ContextMenuListener to get the
JID of the currently selected user, the plugin abort execution.
As I changed the libraries from the Sparkplug Kit, to the one shiped with Spark 2.5.8, the plugin don't crash any more and worked fine...
may someone should update the "Sparkplug Kit"