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/Messages.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2003-2017 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.text.MessageFormat;
import java.util.ResourceBundle;

/**
 * Formats error messages.
 */
class Messages
{
    static String format( String property ) {
        return format( property, null );
    }
    
    static String format( String property, Object arg1 ) {
        return format( property, new Object[]{arg1} );
    }
    
    static String format( String property, Object arg1, Object arg2 ) {
        return format( property, new Object[]{arg1,arg2} );
    }
    
    static String format( String property, Object arg1, Object arg2, Object arg3 ) {
        return format( property, new Object[]{arg1,arg2,arg3} );
    }
    
    // add more if necessary.
    
    /** Loads a string resource and formats it with specified arguments. */
    static String format( String property, Object[] args ) {
        String text = ResourceBundle.getBundle(Messages.class.getName()).getString(property);
        return MessageFormat.format(text,args);
    }
    
//
//
// Message resources
//
//
    static final String PROVIDER_NOT_FOUND = // 1 arg
        "ContextFinder.ProviderNotFound";

    static final String DEFAULT_PROVIDER_NOT_FOUND = // 0 args
        "ContextFinder.DefaultProviderNotFound";

    static final String COULD_NOT_INSTANTIATE = // 2 args
        "ContextFinder.CouldNotInstantiate";
        
    static final String CANT_FIND_PROPERTIES_FILE = // 1 arg
        "ContextFinder.CantFindPropertiesFile";
        
    static final String CANT_MIX_PROVIDERS = // 0 args
        "ContextFinder.CantMixProviders";
        
    static final String MISSING_PROPERTY = // 2 args
        "ContextFinder.MissingProperty";

    static final String NO_PACKAGE_IN_CONTEXTPATH = // 0 args
        "ContextFinder.NoPackageInContextPath";

    static final String NAME_VALUE = // 2 args
        "PropertyException.NameValue";
        
    static final String CONVERTER_MUST_NOT_BE_NULL = // 0 args
        "DatatypeConverter.ConverterMustNotBeNull";

    static final String ILLEGAL_CAST = // 2 args
        "JAXBContext.IllegalCast";

    static final String ERROR_LOAD_CLASS = // 2 args
            "ContextFinder.ErrorLoadClass";

    static final String JAXB_CLASSES_NOT_OPEN = // 1 arg
            "JAXBClasses.notOpen";
}

⏎ javax/xml/bind/Messages.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