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Editorial Team
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Asked: 2026-06-10T18:46:46+00:00

I am building a chat app and I have problem with the MultiUserChat class.

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I am building a chat app and I have problem with the MultiUserChat class. The library I am using is downloaded from the google codes.

After the XMPP connectoin is lost, I am automatically leaving all my joined groups

After the reconnection I am trying to use :

MultiUserChat.getJoinedRooms(xmpp, "1@test.server.com");

so I can all my joined rooms, but I get a NullPointerException.

Anyone have an idea how can rejoined all my joined rooms before I was disconnected?
I thought about storing all my joined in database and then re-joined it after selecting them. Any other idea?

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  1. Editorial Team

    Kamal is right. getJoinedRooms() only returns with a list of rooms if you are connected and joined to some MUC instances. I also recommend to store the MUC JIDs into a database (or just in memory) and rejoin the rooms after a reconnection. We do the same on GTalkSMS.

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