RMI Java server and client will not communicate -

rmiclient, client

package rmiclient;  import java.rmi.rmisecuritymanager; import java.rmi.registry.locateregistry; import java.rmi.registry.registry; import java.util.*;  public class rmiclient {   public static void main(string[] args) {     rmiclient client = new rmiclient(); system.setsecuritymanager(new rmisecuritymanager());     if(args.length == 0)     {     system.out.println("please enter correct server, exiting.");     system.exit(0);     }     client.runmenu(args); }//end main()  public void runmenu(string[] args) {     while (true) {         int commandtorun = 0;         int numberofthreads;         scanner commandscanner = new scanner(system.in);         scanner threadscanner = new scanner(system.in);     system.out.println();         system.out.println("enter number command wish execute.");         system.out.println("1. date & time \n"                 + "2. server uptime \n"                 + "3. memory usage \n"                 + "4. netstat \n"                 + "5. current users \n"                 + "6. running processes \n"                 + "7. exit");         commandtorun = commandscanner.nextint();         system.out.println();         if (commandtorun == 7) {             system.out.println("exiting");             system.exit(0);         } else if(commandtorun > 7 || commandtorun < 1) {             system.out.println("enter valid command");         }         /* else {     if(commandtorun == 1 || commandtorun == 4)     {             system.out.println("enter number of threads run");             numberofthreads = threadscanner.nextint();             clientthreads thread[] = new clientthreads[numberofthreads];             (int = 0; < numberofthreads; i++) {                 thread[i] = new clientthreads(args, commandtorun);             }             (int = 0; < numberofthreads; i++) {                 thread[i].start();         try{         thread[i].join();         }         catch(exception e){}     }     }     else{     numberofthreads = 1;             clientthreads thread[] = new clientthreads[numberofthreads];             (int = 0; < numberofthreads; i++) {                 thread[i] = new clientthreads(args, commandtorun);             }             (int = 0; < numberofthreads; i++) {                 thread[i].start();         try{         thread[i].join();         }         catch(exception e){}}             }*/         }      } }   class clientthreads extends thread {  int commandtorun; string host;  public clientthreads(string[] args, int commandtorun) {     this.commandtorun = commandtorun;     this.host = args[0]; }  public void run() {     string serverresponse = "";     try {         registry registry = locateregistry.getregistry(1225);         rmiinterface stub = (rmiinterface)registry.lookup("runcommand");         serverresponse = stub.runcommand(commandtorun);     } catch (exception e) {         system.out.println(e);     } system.out.println();     system.out.println(serverresponse); } 

}

rmiinterface, interface

package rmiclient; import java.rmi.remote; import java.rmi.remoteexception;  public interface rmiinterface extends remote { string runcommand(int commandtorun) throws remoteexception; 

}

rmiserver, server

package rmiserver;  import java.rmi.registry.registry; import java.rmi.registry.locateregistry; import java.rmi.remoteexception; import java.rmi.server.unicastremoteobject; //import java.rmi.rmisecuritymanager; import java.io.*;   public class rmiserver implements rmiinterface {  public rmiserver() {}  public static void main(string[] args) {   try {         rmiserver obj = new rmiserver();      //   system.setsecuritymanager(new rmisecuritymanager());         rmiinterface stub = (rmiinterface) unicastremoteobject.exportobject(obj, 0);         registry registry = locateregistry.getregistry(1225);         registry.rebind("runcommand", stub);         system.out.println("server starting");     } catch (exception e) {         system.out.println(e);     } }  public string runcommand(int commandtorun) throws remoteexception {     runtime runtime = null;     process process = null;     string command = "";     string output = "";     string newline = "";     bufferedreader inp = null;      try {         if (commandtorun == 1) {             system.out.println("running command: date , time");             runtime = runtime.getruntime();             command = "date";             process = runtime.exec(command);             inp = new bufferedreader(new inputstreamreader(process.getinputstream()));             output = inp.readline();         } else if (commandtorun == 2) {             system.out.println("running command: uptime");             runtime = runtime.getruntime();             command = "uptime";             process = runtime.exec(command);             inp = new bufferedreader(new inputstreamreader(process.getinputstream()));             output = inp.readline();         } else if (commandtorun == 3) {             system.out.println("running command: memory use");             runtime = runtime.getruntime();             command = "free";             process = runtime.exec(command);             inp = new bufferedreader(new inputstreamreader(process.getinputstream()));             while ((newline = inp.readline()) != null) {                 output = output + "\n" + newline;             }         } else if (commandtorun == 4) {             system.out.println("running command: netstat");             runtime = runtime.getruntime();             command = "netstat";             process = runtime.exec(command);             inp = new bufferedreader(new inputstreamreader(process.getinputstream()));             while ((newline = inp.readline()) != null) {                 output = output + "\n" + newline;             }         } else if (commandtorun == 5) {             system.out.println("running command: current users");             runtime = runtime.getruntime();             command = "who";             process = runtime.exec(command);             inp = new bufferedreader(new inputstreamreader(process.getinputstream()));             while ((newline = inp.readline()) != null) {                 output = output + "\n" + newline;             }         } else if (commandtorun == 6) {             system.out.println("running command: running processes");             runtime = runtime.getruntime();             command = "ps -e";             process = runtime.exec(command);             inp = new bufferedreader(new inputstreamreader(process.getinputstream()));             while ((newline = inp.readline()) != null) {                 output = output + "\n" + newline;             }         }     } catch (exception e) {         system.out.println(e);     }     return output; } 

}

please help, feel i'm pretty close getting client , server. pretty close getting them connected utilizing ssh secure shell. after client , server start communicating should easy finish program, when finished able take input client (a number 1-10) , based off number give response server.