java - Increase Maximum Room Occupants count smack api -

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how increase deafult maximum room occupants count '30' desired count. possible smack api?

so far researched, submitform.setanswer("muc#roomconfig_maxusers", 20000); not working thorws exception in thread "main" java.lang.illegalargumentexception: since type 'list-single'

how set value muc#roomconfig_maxusers?

thanks in advance.

i solved problem giving maximum users count in arraylist follows,

 arraylist oarraylist = new arraylist();  oarraylist.add("0")  submitform.setanswer("muc#roomconfig_maxusers", oarraylist);

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