MOXy's Object Graphs - Input/Output Partial Models to XML & JSON

Suppose you have a domain model that you want to expose as a RESTful service.  The problem is you only want to input/output part of your data.  Previously you would have created a separate model representing  the subset and then have code to move data between the models.  In EclipseLink 2.5.0 we have a new feature called Object Graphs that enables you to easily define partial views on your model.

You can try this out today by downloading an EclipseLink 2.5.0 nightly download starting on March 24, 2013 from:

• http://www.eclipse.org/eclipselink/downloads/nightly.php

Binding to JSON & XML - Handling Collections

One of EclipseLink JAXB (MOXy)'s strengths is the ability to map an object model to both JSON and XML with a single set of metadata.  The one weakness had been that you needed to compromise on the JSON key or XML element for collection properties.  I'm happy to say that this issue has been solved in EclipseLink 2.5 (and EclipseLink 2.4.2), and I will demonstrate below with an example.

You can try this out today by downloading an EclipseLink 2.5.0 (or EclipseLink 2.4.2) nightly build starting on March 15, 2013 from:

• http://www.eclipse.org/eclipselink/downloads/nightly.php

JAXB and java.util.Map

Is it ironic that it can be difficult to map the java.util.Map class in JAXB (JSR-222)?  In this post I will cover some items that will make it much easier.

MOXy's @XmlInverseReference is now Truly Bidirectional

EclipseLink JAXB (MOXy)'s @XmlInverseReference annotation enables you to map a back pointer during the unmarshal operation (useful when mapping JPA entities).  The problem was it acted like @XmlTransient during the marshal operation.  This means that previously it could only be used in one direction.  Now I'm happy to announce in EclipseLink 2.5.0 we have expanded @XmlInverseReference so that the corresponding property may be writeable enabling it to be used in both directions.

You can try this out today by downloading one EclipseLink 2.5.0 nightly downloads starting on March 1, 2013 from:

• http://www.eclipse.org/eclipselink/downloads/nightly.php

Leveraging MOXy in your Web Service via JAX-WS Provider

In previous articles I demonstrated how EclipseLink JAXB (MOXy) is directly integrated into the JAX-WS implementations in WebLogic (as of 12.1.1) and in GlassFish (as of 3.1.2).  In this post I'll demonstrate how to leverage MOXy in any application server by using the JAX-WS Provider class.

JAXB's @XmlAnyElement(lax=true) Explained

In a previous post I introduced how the @XmlAnyElement(lax=true) annotation could be used to create a very flexible mapping.  In this post I'll dig a bit deeper into how it relates to both the @XmlRootElement and @XmlElementDecl.

JAXB - Representing Null and Empty Collections

In this post I will cover how to differentiate between null and empty collections in the XML representation with JAXB (JSR-222).

Creating a Generic List Wrapper in JAXB

To marshal/unmarshal a list with a JAXB (JSR-222) implementation you need to create a wrapper object to hold the list. People find this onerous having to create multiple wrapper objects for this purpose.  Below I'll demonstrate that in reality you only need to create one. This post is based on an answer I gave on Stack Overflow.

Using JAXB With XSLT to Produce HTML

JAXB (JSR-222) enables Java to treat a domain model as XML.  In this post I will demonstrate how to leverage this by applying an XSLT stylesheet to a JAXB model to produce HTML.  This approach is often leveraged when creating JAX-RS applications.

Applying a Namespace During JAXB Unmarshal

For some an XML schema is a strict set of rules for how the XML document must be structured.  But for others it is a general guideline to indicate what the XML should look like.  This means that sometimes people want to accept input that doesn't conform to the XML schema for some reason.  In this example I will demonstrate how this can be done by leveraging a SAX XMLFilter.