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Design Documentation: JAXB RI Extensions

ER 359251

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

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

Jan. 2012: Other extension properties: http://jaxb.java.net/2.2/docs/vendorProperties.html


Our intent is to support these extensions as is, so that MOXy can be a drop in replacement for the JAXB RI.

To Do

The following are the outstanding items being targeted for EclipseLink 2.3.3 and 2.4.0.

XML Headers


Object Identity Config


The following items have been checked into EclipseLink 2.3.3 and 2.4.0.

Test Get/Set For All Properties

  • We need to ensure that we test getting all these properties as well as setting them.
  • COMPLETE : org.eclipse.persistence.testing.jaxb.properties.PropertyTestCases

AccessorFactory (2.4 only)

CycleRecoverable (2.4 only)






XML Declaration Control


The following items are of low priority and will be pushed out to a future release.


  • Allows for more flexible mapping (?)
  • Doesn't work if the field to override is not named "content", customization doesn't work (RI)
  • mgrebac: "The above annotation was actually used only for a very specific case of supporting usecase with XmlMixed, and is actually even not expected to be used outside of xjc."


  • 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?
  • mgrebac: "No, this is as well not meant to be user feature, is usable for xjc itself and plugins to point to correct source when there is a failure."


  • Doesn't work in RI
  • Deprecated in the RI, no need to implement since we have XmlIsSetNullPolicy?
  • mgrebac: "Correct - deprecated, unused, we shall be able to remove it safely at this point actually."