jaxb

http://docs.oracle.com/cd/E17802_01/webservices/webservices/docs/1.5/tutorial/doc/JAXBUsing.html
With JAXB you can:
Generate JAXB Java classes from an XML schema
Use schema-derived JAXB classes to unmarshal and marshal XML content in a Java application
Create a Java content tree from scratch using schema-derived JAXB classes
Validate XML content during unmarshalling and at runtime
Customize JAXB schema-to-Java bindings

XSD data types

http://docs.oracle.com/javaee/5/tutorial/doc/bnazq.html

XSD type	Java type
xsd:string	java.lang.String
xsd:integer	java.math.BigInteger
xsd:int	int
xsd.long	long
xsd:short	short
xsd:decimal	java.math.BigDecimal
xsd:float	float
xsd:double	double
xsd:boolean	boolean
xsd:byte	byte
xsd:QName	javax.xml.namespace.QName
xsd:dateTime	javax.xml.datatype.XMLGregorianCalendar
xsd:base64Binary	byte[]
xsd:hexBinary	byte[]
xsd:unsignedInt	long
xsd:unsignedShort	int
xsd:unsignedByte	short
xsd:time	javax.xml.datatype.XMLGregorianCalendar
xsd:date	javax.xml.datatype.XMLGregorianCalendar
xsd:g	javax.xml.datatype.XMLGregorianCalendar
xsd:anySimpleType	java.lang.Object
xsd:anySimpleType	java.lang.String
xsd:duration	javax.xml.datatype.Duration
xsd:NOTATION	javax.xml.namespace.QName

xjc command generation example

cd /tmp
mkdir -p xjctest/xsd
cd xjctest

nano simple.xjb

<jaxb:bindings xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
           xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
           jaxb:extensionBindingPrefixes="xjc"
           jaxb:version="2.0">
  <jaxb:globalBindings generateValueClass="true">
    <xjc:simple />
    <xjc:serializable uid="12343"/> <!-- marks generated class as Serializable-->
    <jaxb:javaType name="java.util.Calendar" xmlType="xs:dateTime"
      parseMethod="javax.xml.bind.DatatypeConverter.parseDateTime"
      printMethod="javax.xml.bind.DatatypeConverter.printDateTime" />
  </jaxb:globalBindings>
</jaxb:bindings>

nano xsd/test.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="test" type="Test"/>                                                                                                                      
  <xs:complexType name="Test">                                                                                                                               
    <xs:sequence>                                                                                                                                            
      <xs:element name="name" type="xs:string" minOccurs="0"/>
      <xs:element name="birthDate" type="xs:dateTime" minOccurs="0"/>
      <xs:element name="dummyInt" type="xs:int" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

Run command

xjc xsd/test.xsd -b simple.xjb -extension -npa

parsing a schema...
compiling a schema...
generated/ObjectFactory.java
generated/Test.java
org/w3/_2001/xmlschema/Adapter1.java

To generate a proper Date it might be necessary to use an adapter for xjb.

Generate Java classes with Maven, xjc and XSD

mkdir -p /tmp/xjctest/src/main/resources

nano pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.allowed.bitarus</groupId>
  <artifactId>xjctest</artifactId>
  <version>0.1.0</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.jvnet.jaxb2.maven2</groupId>
                <artifactId>maven-jaxb2-plugin</artifactId>
                <version>0.11.0</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>                        
                    </execution>
                </executions>
                <configuration>
                        <schemaDirectory>src/main/resources</schemaDirectory>
                        <schemaIncludes>
                            <include>*.xsd</include>
                        </schemaIncludes>
                        <bindingDirectory>src/main/resources</bindingDirectory>
                        <bindingIncludes>
                            <include>*.xjb</include>
                        </bindingIncludes>                   
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Copy test.xsd and and simple.xjb to /tmp/xjctest/src/main/resources
run mvn clean install
The source code is created in /tmp/xjctest/target/generated-sources/xjc/