OIM API To Modify User Details

package com.massiveGaze.users;

import com.massiveGaze.connection.Platform;
import java.util.HashMap;
import oracle.iam.identity.exception.NoSuchUserException;
import oracle.iam.identity.exception.SearchKeyNotUniqueException;
import oracle.iam.identity.exception.UserModifyException;
import oracle.iam.identity.exception.ValidationFailedException;
import oracle.iam.identity.usermgmt.api.UserManager;
import oracle.iam.identity.usermgmt.vo.User;
import oracle.iam.identity.utils.Constants;
import oracle.iam.platform.authz.exception.AccessDeniedException;


public class ModifyUserDetails {
    public static void main(String[] args) {
  modify();
 }
 
     public static void modify(){
   UserManager userManager = (UserManager) Platform.getService(UserManager.class);
   HashMap<String, Object> modifyAttributes=null;
   long MANAGERKEY = 28;
   for(int i=15;i <20;i++){
    modifyAttributes = new HashMap<String, Object>();
    modifyAttributes.put(Constants.MANAGERKEY,MANAGERKEY);
   User user= new User("TUSER_Manager" + i,modifyAttributes);
   try {
   userManager.modify("User Login", "TUSER_Manager" + i, user);
                        
  } catch (ValidationFailedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (UserModifyException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (NoSuchUserException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SearchKeyNotUniqueException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (AccessDeniedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
   }
  } 
}