Socket Listener does not give callbacks

Client Libraries
1

Hello!
I’m currently working on a Match system, like Among Us, where you enter a code to join a lobby. To do this I wanted to use the onMatchPresence Event call. I used the code of this documentation, but I get an ‘onMatchPresence’ overrides nothing error, when I try to compile.

Here’s the java code of the documentation:

@Override
public void onMatchPresence(MatchPresenceEvent e) {
    if (e.getJoins() != null) {
        e.getJoins().forEach(presence -> {
            //joins
        });
    }

    if (e.getLeaves() != null) {
        e.getLeaves().forEach(presence -> {
            if (players.containsKey(presence.getSessionId())) {
                //leaves
            }
        });
    }
}

And I converted the code to Kotlin:

override fun onMatchPresence(e: MatchPresenceEvent) {
    if (e.joins != null) {
        e.joins.forEach { presence ->
            //joins
            recview.addGuest(presence.userId, getDisplayName(presence.userId, presence.username))
        }
    }
    if (e.leaves != null) {
        e.leaves.forEach { presence ->
            //leave
        }
    }
}

Should work the same but I get the error. Can anybody help me out here?

Nakama 3.13
Windows
Java SDK 2.1.4

!!
EDIT:
!!
I’ve now implemented them correctly, but still to not get callbacks when a user joins the lobby!
Does anybody know why this happens?

2

Hi Liam, maybe this could solve your problem:

" By default, Java void is mapped to Unit type in Kotlin . This means that any method that returns void in Java when called from Kotlin will return Unit."

Best,
Michal

3

Unfortunately this doesn’t solve my problem, as Kotlin automatically uses Unit return type when not specified

4

Has anybody else an idea why this is happening? I’m really stuck on this one

5

I solved it. I had to use the AbstractSocketListener, not the SocketListener

For detailed solution check my Stackoverflow post about this

1 Like