EclipseLink/Development/359251

Design Documentation: JAXB Extensions

ER 355766

In the current JAXB RI, developed by Sun, there are a series of "proprietary" JAXB extensions that are available to provide advanced JAXB functionality outside of the JAXB spec (these extension classes reside in the com.sun.xml.bind package).

This page will track the various JAXB Extensions that we want to bring into MOXy.

XmlLocation

• Eclipse Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=355766
• Would give the user more information after unmarshalling, could be useful in WSDL environments, or other times when JAXB XML data may be embedded within other XML

NamespacePrefixMapper

• Allows the user to customize the namespace prefixes that are generated
• Could create our own NamespacePrefixMapper that users could subclass
• Custom Mapper would be provided via Marshaller properties

IDResolver

• http://weblogs.java.net/blog/kohsuke/archive/2005/08/pluggable_ididr.html
• IDResolver works for Kohsuke's first example (Distinctive Symbol Spaces) but the combination with Unmarshall.Listener doesn't seem to work (Scoped Symbol Spaces)
• "THIS INTERFACE IS SUBJECT TO CHANGE WITHOUT NOTICE."

OverrideAnnotationOf

• Allows for more flexible mapping (?)
• Doesn't work if the field to override is not named "content", customization doesn't work (RI)

AccessorFactory

• Added for the benefit of Hibernate users
• Difficult to implement, no documentation, can be replaced by @XmlJavaTypeAdapter

Locatable

• Seems to be mainly used internally by the RI
• Interface only defines get methods... is user resonsible for setting up com.sun.xml.bind.v2.runtime.Location objects? Is this even meant to be a user-feature?

XmlIsSet

• Doesn't work in RI
• Deprecated in the RI, no need to implement since we have XmlIsSetNullPolicy?

CycleRecoverable

• Can't get it to work in RI or Metro!