Openfire connection closed with internal error

Question

So i have this code to connect to openfire

XMPPTCPConnectionConfiguration.Builder config = XMPPTCPConnectionConfiguration.builder();  

      config.setUsernameAndPassword(loginUser, passwordUser);
      config.setSecurityMode(ConnectionConfiguration.SecurityMode.disabled);
      config.setServiceName(serverAddress);
      config.setHost(serverAddress);
      config.setPort(5222);
      config.setDebuggerEnabled(true);
      connection = new XMPPTCPConnection(config.build());
  ReconnectionManager.getInstanceFor(connection).enableAutomaticReconnection();

      System.out.println("Reconnection enabled : " + ReconnectionManager.getInstanceFor(connection).isAutomaticReconnectEnabled());

      ConnectionListener connectionListener = new XMPPConnectionListener();
      connection.addConnectionListener(connectionListener);

but when i try to connect i get this error :

org.jivesoftware.smack.XMPPException$StreamErrorException: internal-server-error You can read more about the meaning of this stream error at http://xmpp.org/rfcs/rfc6120.html#streams-error-conditions at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPConnection.java:1007) at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.access$300(XMPPTCPConnection.java:948) at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader$1.run(XMPPTCPConnection.java:963) at java.lang.Thread.run(Thread.java:744)

EDIT : Openfire's log :

Warn log :

2016.06.13 11:06:31 org.apache.mina.core.filterchain.DefaultIoFilterChain - Unexpected exception from exceptionCaught handler. 
java.lang.NoSuchMethodError:     java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView; 
at org.jivesoftware.openfire.roster.Roster.broadcastPresence(Roster.java:628) 
at org.jivesoftware.openfire.handler.PresenceUpdateHandler.broadcastUpdate(PresenceUpdateHandler.java:309) 
at org.jivesoftware.openfire.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:163) 
at org.jivesoftware.openfire.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:138) 
at org.jivesoftware.openfire.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:202) 
at org.jivesoftware.openfire.PresenceRouter.handle(PresenceRouter.java:144) 
at org.jivesoftware.openfire.PresenceRouter.route(PresenceRouter.java:80) 
at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:88) 
at org.jivesoftware.openfire.SessionManager$ClientSessionListener.onConnectionClose(SessionManager.java:1267) 
at org.jivesoftware.openfire.nio.NIOConnection.notifyCloseListeners(NIOConnection.java:266) 
at org.jivesoftware.openfire.nio.NIOConnection.close(NIOConnection.java:248) 
at org.jivesoftware.openfire.nio.ConnectionHandler.exceptionCaught(ConnectionHandler.java:162) 

i tried to connect to a local openfire server(windows), i succeded, but I fail when i try to connect to an ubuntu openfre server. Any help would be appreciated.

Answer 1

To be precise : openfire needs oracle jre 8 NOT Openjdk