Here you can find the source of setField(Object object, String fieldName, Object newValue)
private static void setField(Object object, String fieldName, Object newValue)
//package com.java2s; /*// ww w .j a va 2 s . co m * RHQ Management Platform * Copyright (C) 2005-2008 Red Hat, Inc. * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ import java.lang.reflect.Field; public class Main { private static void setField(Object object, String fieldName, Object newValue) { try { Field f = object.getClass().getDeclaredField(fieldName); if (f != null) { // try to set the field this way f.setAccessible(true); f.set(object, newValue); } } catch (NoSuchFieldException e) { // ignore this } catch (IllegalAccessException e) { // ignore this } } }