Here you can find the source of findField(Class clazz, String fieldName)
public static Field findField(Class<?> clazz, String fieldName) throws NoSuchFieldException
//package com.java2s; /******************************************************************************************* * The MIT License (MIT)//from ww w. j a v a2 s. c om * * Copyright (c) 2013 Erik R Serating * * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit * persons to whom the Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *********************************************************************************************/ import java.lang.reflect.Field; public class Main { public static Field findField(Class<?> clazz, String fieldName) throws NoSuchFieldException { Field field = null; try { field = clazz.getDeclaredField(fieldName); } catch (NoSuchFieldException e) { } if (field == null) { Class<?> superClazz = clazz.getSuperclass(); if (superClazz != null) { field = findField(superClazz, fieldName); } if (field == null) { throw new NoSuchFieldException("Field: " + fieldName); } else { return field; } } else { return field; } } }