Java Architecture for XML Binding (JAXB) is a Java API that allows Java developers to map Java classes to XML representations.

jaxb-api-2.3.1.jar is the JAR file for the JAXB API 2.3 specification. You can download and use it directly without any building process as shown in the last tutorial.

If you want to rebuild the JAR file, you can download the source code at JAXB API Maven Website.

You can also browse the source code below:

⏎ javax/xml/bind/ServiceLoaderUtil.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2015-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package javax.xml.bind;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.ServiceLoader;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Shared ServiceLoader/FactoryFinder Utils shared among SAAJ, JAXB and JAXWS
 * - this class must be duplicated to all those projects, but it's
 * basically generic code and we want to have it everywhere same.
 *
 * @author Miroslav.Kos@oracle.com
 */
class ServiceLoaderUtil {

    private static final String OSGI_SERVICE_LOADER_CLASS_NAME = "org.glassfish.hk2.osgiresourcelocator.ServiceLoader";
    private static final String OSGI_SERVICE_LOADER_METHOD_NAME = "lookupProviderClasses";

    static <P, T extends Exception> P firstByServiceLoader(Class<P> spiClass,
                                                           Logger logger,
                                                           ExceptionHandler<T> handler) throws T {
        // service discovery
        try {
            ServiceLoader<P> serviceLoader = ServiceLoader.load(spiClass);

            for (P impl : serviceLoader) {
                logger.fine("ServiceProvider loading Facility used; returning object [" +
                        impl.getClass().getName() + "]");

                return impl;
            }
        } catch (Throwable t) {
            throw handler.createException(t, "Error while searching for service [" + spiClass.getName() + "]");
        }
        return null;
    }

    static Object lookupUsingOSGiServiceLoader(String factoryId, Logger logger) {

        try {
            // Use reflection to avoid having any dependendcy on ServiceLoader class
            Class serviceClass = Class.forName(factoryId);
            Class target = Class.forName(OSGI_SERVICE_LOADER_CLASS_NAME);
            Method m = target.getMethod(OSGI_SERVICE_LOADER_METHOD_NAME, Class.class);
            Iterator iter = ((Iterable) m.invoke(null, serviceClass)).iterator();
            if (iter.hasNext()) {
                Object next = iter.next();
                logger.fine("Found implementation using OSGi facility; returning object [" +
                        next.getClass().getName() + "].");
                return next;
            } else {
                return null;
            }
        } catch (IllegalAccessException |
                InvocationTargetException |
                ClassNotFoundException |
                NoSuchMethodException ignored) {

            logger.log(Level.FINE, "Unable to find from OSGi: [" + factoryId + "]", ignored);
            return null;
        }
    }

    static void checkPackageAccess(String className) {
        // make sure that the current thread has an access to the package of the given name.
        SecurityManager s = System.getSecurityManager();
        if (s != null) {
            int i = className.lastIndexOf('.');
            if (i != -1) {
                s.checkPackageAccess(className.substring(0, i));
            }
        }
    }

    static Class nullSafeLoadClass(String className, ClassLoader classLoader) throws ClassNotFoundException {
        if (classLoader == null) {
            return Class.forName(className);
        } else {
            return classLoader.loadClass(className);
        }
    }

    // Returns instance of required class. It checks package access (security)
    // unless it is defaultClassname. It means if you are trying to instantiate
    // default implementation (fallback), pass the class name to both first and second parameter.
    static <T extends Exception> Object newInstance(String className,
                                                    String defaultImplClassName,
                                                    final ExceptionHandler<T> handler) throws T {
        try {
            return safeLoadClass(className, defaultImplClassName, contextClassLoader(handler)).newInstance();
        } catch (ClassNotFoundException x) {
            throw handler.createException(x, "Provider " + className + " not found");
        } catch (Exception x) {
            throw handler.createException(x, "Provider " + className + " could not be instantiated: " + x);
        }
    }

    static Class safeLoadClass(String className,
                               String defaultImplClassName,
                               ClassLoader classLoader) throws ClassNotFoundException {

        try {
            checkPackageAccess(className);
        } catch (SecurityException se) {
            // anyone can access the platform default factory class without permission
            if (defaultImplClassName != null && defaultImplClassName.equals(className)) {
                return Class.forName(className);
            }
            // not platform default implementation ...
            throw se;
        }
        return nullSafeLoadClass(className, classLoader);
    }

    static ClassLoader contextClassLoader(ExceptionHandler exceptionHandler) throws Exception {
        try {
            return Thread.currentThread().getContextClassLoader();
        } catch (Exception x) {
            throw exceptionHandler.createException(x, x.toString());
        }
    }

    static abstract class ExceptionHandler<T extends Exception> {

        public abstract T createException(Throwable throwable, String message);

    }

}

⏎ javax/xml/bind/ServiceLoaderUtil.java

Or download all of them as a single archive file:

File name: jaxb-api-2.3.1-sources.jar
File size: 271123 bytes
Release date: 2018-10-10
Download 

⇒ Download JAXB 2.2 Specification and API JAR

⇐ Download JAXB 2.3 Specification and API JAR

⇑ JAXB (Java Architecture for XML Binding) API Specification

⇑⇑ FAQ for jaxb-*.jar - Java Architecture for XML Binding