Jaxb2RootElementHttpMessageConverter doesn't allow for customizing Marshaller/Unmarshaller [SPR-11488]

[spring-projects-issues]

Eric Miles opened SPR-11488 and commented

We have a need to use Spring managed beans for JAXB XmlAdapters. The only way I've found to do this is to call setAdapter(bean) on Unmarshaller and Marshaller.

Due to the base class AbstractJaxb2HttpMessageConverter making createMarshaller() and createUnmarshaller() final combined with the structure of Jaxb2RootElementHttpMessageConverter, we have no way of reaching those objects. It appears the only way I can do this and still get all the functionality of Jaxb2RootElementHttpMessageConverter is to extend it and override writeToResult and readFromSource while doing a lot of copying and pasting for most of those methods.

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Affects: 4.0.1

[spring-projects-issues]

Rossen Stoyanchev commented

It looks like what you need is the MarshallingHttpMessageConverter. Have you considered that one? Perhaps we should mention it in the Javadoc of Jaxb2RootElementHttpMessageConverter so that it's easier to find.

[spring-projects-issues]

Eric Miles commented

I was not familiar with this so I took a look.

The JAXB Marshaller/Unmarshaller is created from the JAXBContext for each type (or a known set of types up front), so I'm unsure if this would really work in our scenario. I'd have to jump through a number of hoops to get a single Marshaller/Unmarshaller tied to a JAXBContext that knows all types (I'm working on framework level code to be used by other projects).

Unless I'm missing something? Thanks again.

[spring-projects-issues]

Rossen Stoyanchev commented

There are now customize(Un)Marshaller methods invoked after the (Un)Marshaller is created that you should be able to use. Feel free to check it out in 4.0.3.BUILD-SNAPSHOT.