When some users on different nodes occur when operating the exception muc
Because there is no check event.getValue () is empty
The NullPointerException is in ClusterListener.java 474
Collection getHandlers(EntryEvent event) {
Object value = event.getValue();
Collection answer = new ArrayList();
for (DirectedPresence directedPresence : (Collection) value) {
answer.add(directedPresence.getHandler());
}
return answer;
}
I made the following changes to fix it.
Collection getHandlers(EntryEvent event) {
Object value = event.getValue();
Collection answer = new ArrayList();
if (value == null) {
return answer;
}
for (DirectedPresence directedPresence : (Collection) value) {
answer.add(directedPresence.getHandler());
}
return answer;
}
Doing right？