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/helpers/DefaultValidationEventHandler.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]"
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 * 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.helpers;

import org.w3c.dom.Node;

import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;
import javax.xml.bind.ValidationEventLocator;
import java.net.URL;

/**
 * <p>
 * JAXB 1.0 only default validation event handler. This is the default 
 * handler for all objects created from a JAXBContext that is managing
 * schema-derived code generated by a JAXB 1.0 binding compiler. 
 *
 * <p>
 * This handler causes the unmarshal and validate operations to fail on the first
 * error or fatal error.
 * 
 * <p>
 * This handler is not the default handler for JAXB mapped classes following 
 * JAXB 2.0 or later versions. Default validation event handling has changed 
 * and is specified in  {@link javax.xml.bind.Unmarshaller} and 
 * {@link javax.xml.bind.Marshaller}.
 *
 * @author <ul><li>Ryan Shoemaker, Sun Microsystems, Inc.</li></ul>
 * @see javax.xml.bind.Unmarshaller
 * @see javax.xml.bind.Validator
 * @see javax.xml.bind.ValidationEventHandler
 * @since 1.6, JAXB 1.0
 */
public class DefaultValidationEventHandler implements ValidationEventHandler {
    
    public boolean handleEvent( ValidationEvent event ) {
        
        if( event == null ) {
            throw new IllegalArgumentException();
        }

        // calculate the severity prefix and return value        
        String severity = null;
        boolean retVal = false;
        switch ( event.getSeverity() ) {
            case ValidationEvent.WARNING:
                severity = Messages.format( Messages.WARNING );
                retVal = true; // continue after warnings
                break;
            case ValidationEvent.ERROR:
                severity = Messages.format( Messages.ERROR );
                retVal = false; // terminate after errors
                break;
            case ValidationEvent.FATAL_ERROR:
                severity = Messages.format( Messages.FATAL_ERROR );
                retVal = false; // terminate after fatal errors
                break;
            default:
                assert false :
                    Messages.format( Messages.UNRECOGNIZED_SEVERITY,
                            event.getSeverity() );
        }
        
        // calculate the location message
        String location = getLocation( event );
        
        System.out.println( 
            Messages.format( Messages.SEVERITY_MESSAGE,
                             severity,
                             event.getMessage(),
                             location ) );
        
        // fail on the first error or fatal error
        return retVal;
    }

    /**
     * Calculate a location message for the event
     * 
     */
    private String getLocation(ValidationEvent event) {
        StringBuffer msg = new StringBuffer();
        
        ValidationEventLocator locator = event.getLocator();
        
        if( locator != null ) {
            
            URL url = locator.getURL();
            Object obj = locator.getObject();
            Node node = locator.getNode();
            int line = locator.getLineNumber();
            
            if( url!=null || line!=-1 ) {
                msg.append( "line " + line );
                if( url!=null )
                    msg.append( " of " + url );
            } else if( obj != null ) {
                msg.append( " obj: " + obj.toString() );
            } else if( node != null ) {
                msg.append( " node: " + node.toString() );
            }
        } else {
            msg.append( Messages.format( Messages.LOCATION_UNAVAILABLE ) );
        } 
        
        return msg.toString();
    }
}

⏎ javax/xml/bind/helpers/DefaultValidationEventHandler.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