Trail: Java Architecture for XML Binding (JAXB)
Lesson: Introduction to JAXB
Customizing Generated Classes and Java Program Elements
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Customizing Generated Classes and Java Program Elements

The following sections describe how to customize generated JAXB classes and Java program elements.

Schema-to-Java

Custom JAXB binding declarations enable you to customize your generated JAXB classes beyond the XML-specific constraints in an XML schema to include Java-specific refinements, such as class and package name mappings.

JAXB provides two ways to customize an XML schema:

Code examples that show how to customize JAXB bindings are provided later in this document.

Java-to-Schema

The JAXB annotations defined in the javax.xml.bind.annotation package can be used to customize Java program elements to XML schema mapping. The following table summarizes the JAXB annotations that can be used with a Java package.

Table: JAXB Annotations Associated with a Java Package

Annotation Description and Default Setting
@XmlSchema Maps a package to an XML target namespace.
Default settings:
@XmlSchema ( 
    xmlns = {}, 
    namespace = "", 
    elementFormDefault = XmlNsForm.UNSET, 
    attributeFormDefault = XmlNsForm.UNSET
)
@XmlAccessorType Controls default serialization of fields and properties.
Default settings:
@XmlAccessorType (
    value = AccessType.PUBLIC_MEMBER 
)
@XmlAccessorOrder Controls the default ordering of properties and fields mapped to XML elements.
Default settings:
@XmlAccessorOrder (
    value = AccessorOrder.UNDEFINED
)
@XmlSchemaType Allows a customized mapping to an XML Schema built-in type.
Default settings:
@XmlSchemaType (
    namespace = 
    "http://www.w3.org/2001/XMLSchema", 
    type = DEFAULT.class
)
@XmlSchemaTypes A container annotation for defining multiple @XmlSchemaType annotations.
Default settings:None


The following table summarizes JAXB annotations that can be used with a Java class.

Table: JAXB Annotations Associated with a Java Class

Annotation Description and Default Setting
@XmlType Maps a Java class to a schema type.
Default settings:
@XmlType (
    name = "##default", 
    propOrder = {""}, 
    namespace = "##default", 
    factoryClass = DEFAULT.class, 
    factoryMethod = ""
)
@XmlRootElement Associates a global element with the schema type to which the class is mapped.
Default settings:
@XmlRootElement (
    name = "##default", 
    namespace = "##default" 
)

The following table summarizes JAXB annotations that can be used with a Java enum type.

Table: JAXB Annotations Associated with a Java enum Type

Annotation Description and Default Setting
@XmlEnum Maps a Java type to an XML simple type.
Default settings:
@XmlEnum ( value = String.class )
@XmlEnumValue Maps a Java type to an XML simple type.
Default settings:None
@XmlType Maps a Java class to a schema type.
Default settings:
 
@XmlType (
    name = "##default", 
    propOrder = {""}, 
    namespace = "##default", 
    factoryClass = DEFAULT.class, 
    factoryMethod = ""
)
@XmlRootElement Associates a global element with the schema type to which the class is mapped.
Default settings:
@XmlRootElement (
    name = "##default", 
    namespace = "##default" 
)


The following table summarizes JAXB annotations that can be used with Java properties and fields.

Table: JAXB Annotations Associated with Java Properties and Fields

Annotation Description and Default Setting
@XmlElement Maps a JavaBeans property or field to an XML element derived from a property or field name.
Default settings:
@XmlElement (
    name = "##default", 
    nillable = false, 
    namespace = "##default", 
    type = DEFAULT.class, 
    defaultValue = "\u0000"
)
@XmlElements A container annotation for defining multiple @XmlElement annotations.
Default settings:None
@XmlElementRef Maps a JavaBeans property or field to an XML element derived from a property or field’s type.
Default settings:
@XmlElementRef (
    name = "##default", 
    namespace = "##default", 
    type = DEFAULT.class
)
@XmlElementRefs A container annotation for defining multiple @XmlElementRef annotations.
Default settings:None
@XmlElementWrapper Generates a wrapper element around an XML representation. It is typically used as a wrapper XML element around collections.
Default settings:
@XmlElementWrapper (
    name = "##default", 
    namespace = "##default", 
    nillable = false
)
@XmlAnyElement Maps a JavaBeans property to an XML infoset representation or a JAXB element.
Default settings:
@XmlAnyElement (
    lax = false, 
    value = W3CDomHandler.class
)
@XmlAttribute Maps a JavaBeans property to an XML attribute.
Default settings:
@XmlAttribute (
    name = ##default, 
    required = false, 
    namespace = "##default" 
)
@XmlAnyAttribute Maps a JavaBeans property to a map of wildcard attributes.
Default settings:None
@XmlTransient Prevents the mapping of a JavaBeans property to an XML representation.
Default settings:None
@XmlValue Defines mapping of a class to an XML Schema complex type with a simpleContent or an XML Schema simple type.
Default settings:None
@XmlID Maps a JavaBeans property to an XML ID.
Default settings:None
@XmlIDREF Maps a JavaBeans property to an XML IDREF.
Default settings:None
@XmlList Maps a property to a list simple type.
Default settings:None
@XmlMixed Marks a JavaBeans multi-valued property to support mixed content.
Default settings:None
@XmlMimeType Associates the MIME type that controls the XML representation of the property.
Default settings:None
@XmlAttachmentRef Marks a field/property that its XML form is a URI reference to mime content.
Default settings:None
@XmlInlineBinaryData Disables consideration of XOP encoding for data types that are bound to base64-encoded binary data in XML.
Default settings:None


The following table summarizes the JAXB annotation that can be used with object factories.

Table: JAXB Annotations Associated with Object Factories

Annotation Description and Default Setting
@XmlElementDecl Maps a factory method to an XML element.
Default settings:
@XmlElementDecl (
    scope = GLOBAL.class, 
    namespace = "##default", 
    substitutionHeadNamespace = "##default", 
    substitutionHeadName = ""
)


The following table summarizes JAXB annotations that can be used with adapters.

Table: JAXB Annotations Associated with Adapters

Annotation Description and Default Setting
@XmlJavaTypeAdapter Use the adapter that implements the @XmlAdapter annotation for custom marshalling.
Default settings:
@XmlJavaTypeAdapter ( type = DEFAULT.class )
@XmlJavaTypeAdapters A container annotation for defining multiple @XmlJavaTypeAdapter annotations at the package level.
Default settings: None



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