RE: code falls apart when add this to idl: string getClient1Name();

Question

I have a counter object that has at most two clients connected to it.
I do not want the same two clients in the regClients String[]. Since restriction is that we only want two registered clients we can just check position one of array. Note array starts from position 0.
When I add function getClient1Name(), results in error
All other code works.
module Cbackcom
  interface Cback
  { void callback(in long par);
  interface Counter
  { void regist(in Cback objRef, in string client);
    void finish(in string client);
    void action(in long num);
    long  getClientNo();
    string getClient1Name();  //
here is my servant class in the server class
class CounterServant extends _CounterImplBase
{ private int      actclient;
  private Cback [] clients;
  private String[] regclients;
  private int      number;
  // constructor
  CounterServant()
  { number    = 0;
    actclient = 0;
    clients   = new Cback[2];
    regclients= new String[2];
    System.out.println("SERVER SIDE");
    System.out.println("counter servant started");
  ///return the current number of clients
  public int getClientNo()
   return actclient;
  public String getClient1Name() {
    String returnString = ""; //null string
   if (regclients[0] !=null)
     returnString = regclients[0];
    return returnString;
here is the client class:
class CbackServant extends _CbackImplBase
{ public void callback(int num)
  { System.out.println("CLIENT SIDE");
    System.out.println("counter's current value = " + num);
public class CbackcomClient
  public static void main(String args[])
  { try
    { // create and initialize the ORB
      //note client is read from command prompt
      //it is read at execution time
       String client = new String(args[2]);
      // get the root naming context
      // resolve the Object Reference in Naming
      Counter countRef = CounterHelper.narrow(ncRef.resolve(path));
      CbackServant cbackRef = new CbackServant();
      int clientNO = countRef.getClientNo();
      if (clientNO <= 1)
          System.out.println("current client number is: " + clientNO );
          System.out.println("check if already a registered client");
   /********* problem occurs here please help ******/      
          String client1 = ""; //null value string
       if(clientNO == 1)
          client1 = countRef.getClient1Name();
          if (client.equals(client1) )
              System.out.println("sorry your already a registered client");
       orb.connect(cbackRef);
                 countRef.regist(cbackRef, client);
     catch (Exception e)
     { System.out.println("ERROR : " + e) ;
       e.printStackTrace(System.out);
here is the error:
java CbackcomClient -ORBInitialPort 1030 Sid
making first check
current client number is: 0
check if already a registered client
ERROR : org.omg.CORBA.BAD_PARAM:   minor code: 1 completed: Maybe
org.omg.CORBA.BAD_PARAM:   minor code: 1 completed: Maybe
        at java.lang.Throwable.fillInStackTrace(Native Method)
        at java.lang.Throwable.<init>(Throwable.java:94)
        at java.lang.Exception.<init>(Exception.java:42)
        at java.lang.RuntimeException.<init>(RuntimeException.java:47)
        at org.omg.CORBA.SystemException.<init>(SystemException.java:49)
        at org.omg.CORBA.BAD_PARAM.<init>(BAD_PARAM.java:74)
        at org.omg.CORBA.BAD_PARAM.<init>(BAD_PARAM.java:50)
        at org.omg.CORBA.BAD_PARAM.<init>(BAD_PARAM.java:39)
        at java.lang.Class.newInstance0(Native Method)
        at java.lang.Class.newInstance0(Compiled Code)
        at java.lang.Class.newInstance(Compiled Code)
        at com.sun.CORBA.iiop.ReplyMessage.getSystemException(ReplyMessage.java:75)
        at com.sun.CORBA.iiop.ClientResponseImpl.getSystemException(ClientResponseImpl.java:85)
        at com.sun.CORBA.idl.RequestImpl.doInvocation(Compiled Code)
        at com.sun.CORBA.idl.RequestImpl.invoke(RequestImpl.java:219)
        at Cbackcom._CounterStub.getClient1Name(_CounterStub.java:66)
        at CbackcomClient.main(Compiled Code)Please help

Answer 1

Please reply...
I have programmes block
I do not know what I am doing wrong.
To me the answer seems logical to me..
Here is the idl:
module Cbackcom
//here is the code that goes wrong
string getClient1Name();
here is my servant class in the server class
                             class CounterServant extends _CounterImplBase
                             { private int actclient;
                             private Cback [] clients;
                             private String[] regclients;
                             private int number;
                             // constructor
                             CounterServant()
                             { number = 0;
                             actclient = 0;
                             clients = new Cback[2];
                             regclients= new String[2];
                             System.out.println("SERVER SIDE");
                             System.out.println("counter servant started");
                             ///return the current number of clients
                             public int getClientNo()
                             return actclient;
                             public String getClient1Name() {
                        **** simple returning of client returned at position 0 of array
perhaps should change code here *****
                             here is the client class:
                             class CbackServant extends _CbackImplBase
                             { public void callback(int num)
                             { System.out.println("CLIENT SIDE");
                             System.out.println("counter's current value = " + num);
                             public class CbackcomClient
                             public static void main(String args[])
                             { try
                             { // create and initialize the ORB
                             //note client is read from command prompt
                             //it is read at execution time
                             String client = new String(args[2]);
                             // get the root naming context
                             // resolve the Object Reference in Naming
                             Counter countRef = CounterHelper.narrow(ncRef.resolve(path));
                             CbackServant cbackRef = new CbackServant();
                             int clientNO = countRef.getClientNo();
                             if (clientNO <= 1)
                             System.out.println("current client number is: " + clientNO );
                             System.out.println("check if already a registered client");
                             /********* problem occurs here please help ******/
                             String client1 = ""; //null value string
                             if(clientNO == 1)
                             client1 = countRef.getClient1Name();
plz help...