Here you can find the source of getJAXBContext(Class> clazz)
private static JAXBContext getJAXBContext(Class<?> clazz) throws JAXBException
//package com.java2s; /*// w w w . java2 s . c o m * 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 java.util.HashMap; import java.util.Map; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; public class Main { private static final ThreadLocal<Map<String, JAXBContext>> threadLocal = new ThreadLocal<Map<String, JAXBContext>>() { @Override protected Map<String, JAXBContext> initialValue() { return new HashMap<String, JAXBContext>(); } }; private static JAXBContext getJAXBContext(Class<?> clazz) throws JAXBException { Map<String, JAXBContext> cache = threadLocal.get(); JAXBContext jc = cache.get(clazz.getName()); if (jc == null) { jc = JAXBContext.newInstance(clazz); cache.put(clazz.getName(), jc); } return jc; } }