Servlet - tableau et StringTokenizer

 import java.util.StringTokenizer;
 
public class decoupchaine {
 public static void main(String[] args) {
String bl="usr;local;java;";
    StringTokenizer st =  new StringTokenizer(bl, ";");
    while (st.hasMoreTokens()) {
      System.out.println(st.nextToken());
    }
  }
  
}

	

package com.mine.web;
import com.mine.model.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
 //import java.util.StringTokenizer;

public class CoffeeSelect extends HttpServlet {

    @Override
  public void doPost( HttpServletRequest request,
                      HttpServletResponse response)
                      throws IOException, ServletException {
//bl devient ici dciR
String dciR = request.getParameter("dciR ");
String[] dciR1=null;       
Integer i=0;

    StringTokenizer st = new StringTokenizer(dciR, ";");
    while (st.hasMoreTokens()) {
      dciR1[i]=st.nextToken();
      i++;
    }
    request.setAttribute("dciR", dciR );
    RequestDispatcher view = request.getRequestDispatcher("result.jsp");
    view.forward(request, response);
  }
}

java.lang.NullPointerException
	java.util.StringTokenizer.<init>(StringTokenizer.java:182)
	java.util.StringTokenizer.<init>(StringTokenizer.java:204)
	com.example.web.CoffeeSelect.doPost(CoffeeSelect.java:45)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)

  String[] dci= (String[]) request.getAttribute("dciR");
    for (int i=0 ; i < dci.length ; i++)
                System.out.println (dci[i]);