JAXB API Source Code

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:

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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
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package javax.xml.bind;

import javax.xml.namespace.QName;
import java.io.Serializable;

 * <p>JAXB representation of an Xml Element.</p>
 * <p>This class represents information about an Xml Element from both the element 
 * declaration within a schema and the element instance value within an xml document
 * with the following properties
 * <ul>
 *   <li>element's xml tag <b>{@code name}</b></li>
 *   <li><b>{@code value}</b> represents the element instance's atttribute(s) and content model</li>
 *   <li>element declaration's <b>{@code declaredType}</b> ({@code xs:element @type} attribute)</li>
 *   <li><b>{@code scope}</b> of element declaration</li>
 *   <li>boolean <b>{@code nil}</b> property. (element instance's <b>{@code xsi:nil}</b> attribute)</li>
 * </ul>
 * <p>The {@code declaredType} and {@code scope} property are the
 * JAXB class binding for the xml type definition.
 * </p>
 * <p><b>{@code Scope}</b> is either {@link GlobalScope} or the Java class representing the
 * complex type definition containing the schema element declaration.
 * </p>
 * <p>There is a property constraint that if <b>{@code value}</b> is {@code null},
 * then {@code nil} must be {@code true}. The converse is not true to enable
 * representing a nil element with attribute(s). If {@code nil} is true, it is possible
 * that {@code value} is non-null so it can hold the value of the attributes
 * associated with a nil element.
 * </p>
 * @author Kohsuke Kawaguchi, Joe Fialli
 * @since 1.6, JAXB 2.0

public class JAXBElement<T> implements Serializable {

    /** xml element tag name */
    final protected QName name;

    /** Java datatype binding for xml element declaration's type. */
    final protected Class<T> declaredType;

    /** Scope of xml element declaration representing this xml element instance.
     *  Can be one of the following values:
     *  - {@link GlobalScope} for global xml element declaration.
     *  - local element declaration has a scope set to the Java class 
     *     representation of complex type defintion containing
     *     xml element declaration. 
    final protected Class scope;

    /** xml element value. 
        Represents content model and attributes of an xml element instance. */
    protected T value;

    /** true iff the xml element instance has xsi:nil="true". */
    protected boolean nil = false;

     * Designates global scope for an xml element.
    public static final class GlobalScope {}

     * <p>Construct an xml element instance.</p>
     * @param name          Java binding of xml element tag name
     * @param declaredType  Java binding of xml element declaration's type
     * @param scope
     *      Java binding of scope of xml element declaration.
     *      Passing null is the same as passing {@code GlobalScope.class}
     * @param value
     *      Java instance representing xml element's value.
     * @see #getScope()
     * @see #isTypeSubstituted()
    public JAXBElement(QName name, 
		       Class<T> declaredType, 
		       Class scope,
		       T value) {
        if(declaredType==null || name==null)
            throw new IllegalArgumentException();
        this.declaredType = declaredType;
        if(scope==null)     scope = GlobalScope.class;
        this.scope = scope;
        this.name = name;

     * Construct an xml element instance.
     * This is just a convenience method for {@code new JAXBElement(name,declaredType,GlobalScope.class,value)}
    public JAXBElement(QName name, Class<T> declaredType, T value ) {

     * Returns the Java binding of the xml element declaration's type attribute.
    public Class<T> getDeclaredType() {
        return declaredType;

     * Returns the xml element tag name.
    public QName getName() {
        return name;

     * <p>Set the content model and attributes of this xml element.</p>
     * <p>When this property is set to {@code null}, {@code isNil()} must by {@code true}.
     *    Details of constraint are described at {@link #isNil()}.</p>
     * @see #isTypeSubstituted()
    public void setValue(T t) {
        this.value = t;

     * <p>Return the content model and attribute values for this element.</p>
     * <p>See {@link #isNil()} for a description of a property constraint when
     * this value is {@code null}</p>
    public T getValue() {
        return value;

     * Returns scope of xml element declaration.
     * @see #isGlobalScope()
     * @return {@code GlobalScope.class} if this element is of global scope.
    public Class getScope() {
        return scope;
     * <p>Returns {@code true} iff this element instance content model
     * is nil.</p>
     * <p>This property always returns {@code true} when {@link #getValue()} is null.
     * Note that the converse is not true, when this property is {@code true},
     * {@link #getValue()} can contain a non-null value for attribute(s). It is
     * valid for a nil xml element to have attribute(s).</p>
    public boolean isNil() {
        return (value == null) || nil;

     * <p>Set whether this element has nil content.</p>
     * @see #isNil()
    public void setNil(boolean value) {
        this.nil = value;
    /* Convenience methods  
     * (Not necessary but they do unambiguously conceptualize 
     *  the rationale behind this class' fields.)

     * Returns true iff this xml element declaration is global.
    public boolean isGlobalScope() {
        return this.scope == GlobalScope.class;

     * Returns true iff this xml element instance's value has a different
     * type than xml element declaration's declared type.
    public boolean isTypeSubstituted() {
        if(value==null)     return false;
        return value.getClass() != declaredType;

    private static final long serialVersionUID = 1L;



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 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

2018-06-06, 18280👍, 0💬