Java tutorial
//package com.java2s; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; public class Main { private static DocumentBuilder db = null; static synchronized DocumentBuilder db() { if (null != db) return db; try { db = DocumentBuilderFactory.newInstance().newDocumentBuilder(); } catch (ParserConfigurationException e) { e.printStackTrace(); } return db; } }