multithreading - JGroups RPC: NoSuchMethodException -

have view consisting of 3 server nodes (american samoa, alaska, alabama) , 1 client node (voterclient). whenever try invoke vote method in first server within view in below case american samoa, nosuchmethodexception. here list of nodes in view shown below: (ping_dest american samoa, pingable_mbrs=[american samoa, alaska, alabama, voterclient]). when call

// call vote method on state. voteresult = dispatcher.callremotemethod(address1, "vote",     new object[] { obj.id, obj.candidate },     new class[] { string.class, string.class },     new requestoptions(responsemode.get_all,    50000)); 

where address1 address of "american samoa", , obj.id , obj.candidate string parameters of remote vote method, nosuchmethodexception.

here log , exception:

 1644 debug [main]         org.jgroups.protocols.fd_sock     - view_change received: [american samoa, alaska, alabama, voterclient, voterclient] 1664 debug [fd_sock pinger,stateservergroup,voterclient]         org.jgroups.protocols.fd_sock     - ping_dest american samoa, pingable_mbrs=[american samoa, alaska, alabama, voterclient, voterclient] 1664 debug [main]   org.jgroups.protocols.pbcast.stable     - [ergonomics] setting max_bytes 20mb (5 members) should occuring right????? state server address: american samoa. java.lang.nosuchmethodexception: vote     @ org.jgroups.blocks.methodcall.invoke(methodcall.java:312)     @ org.jgroups.blocks.rpcdispatcher.handle(rpcdispatcher.java:326)     @ org.jgroups.blocks.requestcorrelator.handlerequest(requestcorrelator.java:456)     @ org.jgroups.blocks.requestcorrelator.receivemessage(requestcorrelator.java:363)     @ org.jgroups.blocks.requestcorrelator.receive(requestcorrelator.java:238)     @ org.jgroups.blocks.messagedispatcher$protocoladapter.up(messagedispatcher.java:543)     @ org.jgroups.jchannel.up(jchannel.java:716)     @ org.jgroups.stack.protocolstack.up(protocolstack.java:1026)     @ org.jgroups.protocols.pbcast.state_transfer.up(state_transfer.java:178)     @ org.jgroups.protocols.frag2.up(frag2.java:181)     @ org.jgroups.protocols.flowcontrol.up(flowcontrol.java:418)     @ org.jgroups.protocols.flowcontrol.up(flowcontrol.java:400)     @ org.jgroups.protocols.pbcast.gms.up(gms.java:889) ...     @ org.jgroups.protocols.tp$incomingpacket.handlemymessage(tp.java:1728)     @ org.jgroups.protocols.tp$incomingpacket.run(tp.java:1710)     @ java.util.concurrent.threadpoolexecutor.runworker(unknown source)     @ java.util.concurrent.threadpoolexecutor$worker.run(unknown source)     @ java.lang.thread.run(unknown source) failed on dispatcher voteaction. 

here vote method:

 public class evoterserver extends receiveradapter implements runnable{     private static final string serverproperties = null; // default properties     private static logger logger = logger.getlogger(evoterserver.class);     private jchannel channel = null;     private string statename = null;         private static final string serverproperties = null; // default properties     private static final string channelname = "stateservergroup";     private boolean isrunning = true;      @override     public void run() {         try {                channel = new jchannel(serverproperties);             channel.setname(statename);             @suppresswarnings("unused")             rpcdispatcher dispatcher = new rpcdispatcher(channel, this, this, this);             channel.connect(channelname);             channel.getstate(null, 0);              logger.info(statename + " server started @ " + new date() + ".");             logger.info(statename + " joined channel '" + channelname + "' (" + channel.getview().size() + " members).");             logger.info(statename + " server ready serve requests.");             logger.info(statename + " server's channel address " + channel.getaddress() + ".");              isrunning = true;              while(isrunning) {                 util.sleep(10000);             }         }         catch(exception e) {             logger.error("evoterserver.run(); state: " + statename + "; " + e.getmessage(), e);         }                 {             util.close(channel);         }     }      public boolean vote(string voterid, string candidatename)     {          system.out.println("vote " + candidatename + " " + voterid + ".");          return true;     } } 

here driver class' (main method snippet); how initialize servers each state.

 string [] state_names = {"alabama", "alaska", "american samoa"};        (int = 0; < 3; i++) {            try {               evoterserver server = new evoterserver(state_names[i]);               new thread(server).start();             } catch (throwable t) {                logger.error(t.getmessage(), t);             }        } 

i think has coordinator elected gms. client can't vote when coordinator same voting server state. below shows how coordinator american samoa elected:

 1401 debug [main]             org.jgroups.protocols.udp     - created unicast receiver thread  1401 debug [main]             org.jgroups.protocols.udp     - created multicast receiver thread  1411 debug [main]      org.jgroups.protocols.pbcast.gms     - election results: {american samoa=2} 1411 debug [main]      org.jgroups.protocols.pbcast.gms     - sending join(voterclient) american samoa 1523 debug [main]   org.jgroups.protocols.pbcast.nakack     -  [setdigest()] 

java.lang.nosuchmethodexception: vote

jgroups throws exception methodcall.invoke() if unable find method in question. see number of reasons why happening:

• you mentioned working on other servers. 1 running older version of software? maybe vote() method updated recently?
• any chance evoterserver handler object has not been registered appropriately?
• i'm curious error message failed on dispatcher voteaction. voteaction? chance registered instead of evoterserver? maybe that's different channel accident attached wrong group?

hope here helps.