Fetching OU's from Active Directory but displaying only 1000 OU's

Question

Fetching OU's from Active Directory but displaying only 1000 OU's. I want more than 2000 OU's can any one help me?. I have tried this code but i am unable to fetch more than 1000 OU's.

      System.out.println("Début du test Active Directory");

      Hashtable<String, String> ldapEnv = new Hashtable<String, String>(11);
      ldapEnv.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");         
      ldapEnv.put(Context.PROVIDER_URL,  "ldap://1.25.25.25:389");
      ldapEnv.put(Context.SECURITY_AUTHENTICATION, "simple");
      ldapEnv.put(Context.SECURITY_PRINCIPAL, "cn=administrateur,cn=users,dc=societe,dc=fr");
      ldapEnv.put(Context.SECURITY_CREDENTIALS, "password");
      ldapContext = new InitialDirContext(ldapEnv);

      // Create the search controls         
      SearchControls searchCtls = new SearchControls();

      //Specify the attributes to return
      String returnedAtts[]={"sn","givenName", "samAccountName"};
      searchCtls.setReturningAttributes(returnedAtts);

      //Specify the search scope
      searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);

      //specify the LDAP search filter
      String searchFilter = "(&(objectClass=organizationalUnit))";

      //Specify the Base for the search
      String searchBase = "dc=demo,dc=com";
      //initialize counter to total the results
      int totalResults = 0;

      // Search for objects using the filter
      NamingEnumeration<SearchResult> answer = ldapContext.search(searchBase, searchFilter, searchCtls);
      //Loop through the search results
      while (answer.hasMoreElements())
      {
        SearchResult sr = (SearchResult)answer.next();

        totalResults++;

        System.out.println(">>>" + sr.getName());
        Attributes attrs = sr.getAttributes();
        System.out.println(">>>>>>" + attrs.get("samAccountName"));
      }

      System.out.println("Total results: " + totalResults);
      ldapContext.close();
    }