Here you can find the source of transformer()
public static Transformer transformer() throws TransformerConfigurationException
//package com.java2s; /*/*from w w w . j ava2 s .c om*/ * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import javax.xml.transform.Source; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerConfigurationException; import javax.xml.transform.TransformerFactory; public class Main { private static final ThreadLocal<TransformerFactory> TRANSFORMER_FACTORY = new ThreadLocal<TransformerFactory>(); public static Transformer transformer() throws TransformerConfigurationException { TransformerFactory tf = TRANSFORMER_FACTORY.get(); if (tf == null) { tf = TransformerFactory.newInstance(); TRANSFORMER_FACTORY.set(tf); } return tf.newTransformer(); } private static Transformer transformer(Source xsltSource) throws TransformerConfigurationException { TransformerFactory tf = TRANSFORMER_FACTORY.get(); if (tf == null) { tf = TransformerFactory.newInstance(); TRANSFORMER_FACTORY.set(tf); } return tf.newTransformer(xsltSource); } }