Generate your JAXB classes in a second with xjc (http://www.thoughts-on-java.org/2014/01/generate-your-jaxb-classes-in-second.html)

AuthorEntity.java

//
// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.2.4-2 
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
// Any modifications to this file will be lost upon recompilation of the source schema. 
// Generated on: 2014.01.13 at 07:38:24 PM CET 
//


package blog.thoughts.on.java;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlType;


/**
 * <p>Java class for author complex type.
 * 
 * <p>The following schema fragment specifies the expected content contained within this class.
 * 
 * <pre>
 * &lt;complexType name="author">
 *   &lt;complexContent>
 *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *       &lt;sequence>
 *         &lt;element name="firstName" type="{http://www.w3.org/2001/XMLSchema}string" minOccurs="0"/>
 *         &lt;element name="lastName" type="{http://www.w3.org/2001/XMLSchema}string" minOccurs="0"/>
 *       &lt;/sequence>
 *     &lt;/restriction>
 *   &lt;/complexContent>
 * &lt;/complexType>
 * </pre>
 * 
 * 
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "author", propOrder = {
    "firstName",
    "lastName"
})
public class Author {

    protected String firstName;
    protected String lastName;

    /**
     * Gets the value of the firstName property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getFirstName() {
        return firstName;
    }

    /**
     * Sets the value of the firstName property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setFirstName(String value) {
        this.firstName = value;
    }

    /**
     * Gets the value of the lastName property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getLastName() {
        return lastName;
    }

    /**
     * Sets the value of the lastName property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setLastName(String value) {
        this.lastName = value;
    }

}

BookEntity.java

//
// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.2.4-2 
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
// Any modifications to this file will be lost upon recompilation of the source schema. 
// Generated on: 2014.01.13 at 07:38:24 PM CET 
//


package blog.thoughts.on.java;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlSchemaType;
import javax.xml.bind.annotation.XmlType;
import javax.xml.datatype.XMLGregorianCalendar;


/**
 * <p>Java class for book complex type.
 * 
 * <p>The following schema fragment specifies the expected content contained within this class.
 * 
 * <pre>
 * &lt;complexType name="book">
 *   &lt;complexContent>
 *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *       &lt;sequence>
 *         &lt;element ref="{}author" minOccurs="0"/>
 *         &lt;element name="pages" type="{http://www.w3.org/2001/XMLSchema}int"/>
 *         &lt;element name="publicationDate" type="{http://www.w3.org/2001/XMLSchema}dateTime" minOccurs="0"/>
 *         &lt;element name="title" type="{http://www.w3.org/2001/XMLSchema}string" minOccurs="0"/>
 *       &lt;/sequence>
 *     &lt;/restriction>
 *   &lt;/complexContent>
 * &lt;/complexType>
 * </pre>
 * 
 * 
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "book", propOrder = {
    "author",
    "pages",
    "publicationDate",
    "title"
})
public class Book {

    protected Author author;
    protected int pages;
    @XmlSchemaType(name = "dateTime")
    protected XMLGregorianCalendar publicationDate;
    protected String title;

    /**
     * Gets the value of the author property.
     * 
     * @return
     *     possible object is
     *     {@link Author }
     *     
     */
    public Author getAuthor() {
        return author;
    }

    /**
     * Sets the value of the author property.
     * 
     * @param value
     *     allowed object is
     *     {@link Author }
     *     
     */
    public void setAuthor(Author value) {
        this.author = value;
    }

    /**
     * Gets the value of the pages property.
     * 
     */
    public int getPages() {
        return pages;
    }

    /**
     * Sets the value of the pages property.
     * 
     */
    public void setPages(int value) {
        this.pages = value;
    }

    /**
     * Gets the value of the publicationDate property.
     * 
     * @return
     *     possible object is
     *     {@link XMLGregorianCalendar }
     *     
     */
    public XMLGregorianCalendar getPublicationDate() {
        return publicationDate;
    }

    /**
     * Sets the value of the publicationDate property.
     * 
     * @param value
     *     allowed object is
     *     {@link XMLGregorianCalendar }
     *     
     */
    public void setPublicationDate(XMLGregorianCalendar value) {
        this.publicationDate = value;
    }

    /**
     * Gets the value of the title property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getTitle() {
        return title;
    }

    /**
     * Sets the value of the title property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setTitle(String value) {
        this.title = value;
    }

}

generateClasses.sh

xjc -d src -p blog.thoughts.on.java schema.xsd

parsing a schema...
compiling a schema...
blog\thoughts\on\java\Author.java
blog\thoughts\on\java\Book.java
blog\thoughts\on\java\ObjectFactory.java

ObjectFactory.java

//
// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.2.4-2 
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
// Any modifications to this file will be lost upon recompilation of the source schema. 
// Generated on: 2014.01.13 at 07:38:24 PM CET 
//


package blog.thoughts.on.java;

import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.XmlElementDecl;
import javax.xml.bind.annotation.XmlRegistry;
import javax.xml.namespace.QName;


/**
 * This object contains factory methods for each 
 * Java content interface and Java element interface 
 * generated in the blog.thoughts.on.java package. 
 * <p>An ObjectFactory allows you to programatically 
 * construct new instances of the Java representation 
 * for XML content. The Java representation of XML 
 * content can consist of schema derived interfaces 
 * and classes representing the binding of schema 
 * type definitions, element declarations and model 
 * groups.  Factory methods for each of these are 
 * provided in this class.
 * 
 */
@XmlRegistry
public class ObjectFactory {

    private final static QName _Author_QNAME = new QName("", "author");
    private final static QName _Book_QNAME = new QName("", "book");

    /**
     * Create a new ObjectFactory that can be used to create new instances of schema derived classes for package: blog.thoughts.on.java
     * 
     */
    public ObjectFactory() {
    }

    /**
     * Create an instance of {@link Author }
     * 
     */
    public Author createAuthor() {
        return new Author();
    }

    /**
     * Create an instance of {@link Book }
     * 
     */
    public Book createBook() {
        return new Book();
    }

    /**
     * Create an instance of {@link JAXBElement }{@code <}{@link Author }{@code >}}
     * 
     */
    @XmlElementDecl(namespace = "", name = "author")
    public JAXBElement<Author> createAuthor(Author value) {
        return new JAXBElement<Author>(_Author_QNAME, Author.class, null, value);
    }

    /**
     * Create an instance of {@link JAXBElement }{@code <}{@link Book }{@code >}}
     * 
     */
    @XmlElementDecl(namespace = "", name = "book")
    public JAXBElement<Book> createBook(Book value) {
        return new JAXBElement<Book>(_Book_QNAME, Book.class, null, value);
    }

} 

schema.xsd

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:element name="author" type="author"/>

  <xs:element name="book" type="book"/>

  <xs:complexType name="author">
    <xs:sequence>
      <xs:element name="firstName" type="xs:string" minOccurs="0"/>
      <xs:element name="lastName" type="xs:string" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="book">
    <xs:sequence>
      <xs:element ref="author" minOccurs="0"/>
      <xs:element name="pages" type="xs:int"/>
      <xs:element name="publicationDate" type="xs:dateTime" minOccurs="0"/>
      <xs:element name="title" type="xs:string" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

useXjc.sh

Usage: xjc [-options ...] <schema file/URL/dir/jar> ... [-b <bindinfo>] ...
If dir is specified, all schema files in it will be compiled.
If jar is specified, /META-INF/sun-jaxb.episode binding file will be compiled.
Options:
  -nv                :  do not perform strict validation of the input schema(s)
  -extension         :  allow vendor extensions - do not strictly follow the
                        Compatibility Rules and App E.2 from the JAXB Spec
  -b <file/dir>      :  specify external bindings files (each <file> must have its own -b)
                        If a directory is given, **/*.xjb is searched
  -d <dir>           :  generated files will go into this directory
  -p <pkg>           :  specifies the target package
  -httpproxy <proxy> :  set HTTP/HTTPS proxy. Format is [user[:password]@]proxyHost:proxyPort
  -httpproxyfile <f> :  Works like -httpproxy but takes the argument in a file to protect password
  -classpath <arg>   :  specify where to find user class files
  -catalog <file>    :  specify catalog files to resolve external entity references
                        support TR9401, XCatalog, and OASIS XML Catalog format.
  -readOnly          :  generated files will be in read-only mode
  -npa               :  suppress generation of package level annotations (**/package-info.java)
  -no-header         :  suppress generation of a file header with timestamp
  -target (2.0|2.1)  :  behave like XJC 2.0 or 2.1 and generate code that doesnt use any 2.2 features.
  -encoding <encoding> :  specify character encoding for generated source files
  -enableIntrospection :  enable correct generation of Boolean getters/setters to enable Bean Introspection apis
  -contentForWildcard  :  generates content property for types with multiple xs:any derived elements
  -xmlschema         :  treat input as W3C XML Schema (default)
  -relaxng           :  treat input as RELAX NG (experimental,unsupported)
  -relaxng-compact   :  treat input as RELAX NG compact syntax (experimental,unsupported)
  -dtd               :  treat input as XML DTD (experimental,unsupported)
  -wsdl              :  treat input as WSDL and compile schemas inside it (experimental,unsupported)
  -verbose           :  be extra verbose
  -quiet             :  suppress compiler output
  -help              :  display this help message
  -version           :  display version information
  -fullversion       :  display full version information


Extensions:
  -Xinject-code      :  inject specified Java code fragments into the generated code
  -Xlocator          :  enable source location support for generated code
  -Xsync-methods     :  generate accessor methods with the 'synchronized' keyword
  -mark-generated    :  mark the generated code as @javax.annotation.Generated
  -episode <FILE>    :  generate the episode file for separate compilation