Exception:
java.lang.AbstractMethodError
at org.jivesoftware.openfire.muc.MUCEventDispatcher.occupantLeft(MUCEventDispatcher.java:68)
at org.jivesoftware.openfire.muc.MUCRoom.removeOccupantRole(MUCRoom.java:1283)
at org.jivesoftware.openfire.muc.MUCRoom.destroyRoom(MUCRoom.java:1338)
at org.jivesoftware.openfire.admin.muc_002droom_002ddelete_jsp._jspService(muc_002droom_002ddelete_jsp.java:181)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:71)
Thanks for reporting this. I have not yet been able to reproduce this problem. Iām creating a new room in the admin console, then deleting it again. Are other steps needed?
Another potential cause for this issue is that you are using a plugin that implements org.jivesoftware.openfire.muc.MUCEventListener, which has not been updated to 4.7.x. Does that happen to be the case?