PropertyException when setting Marshaller property

问题:

I'm attempting to follow the example located here but get an javax.xml.bind.PropertyException. I receive this exception because of the following line of code:

marshaller.setProperty("eclipselink.media-type", "application/json");

I have literally copy/pasted the example listed above so my code is exactly what you see there. Searching SO and Google for this has not been helpful, and thought I'd bring this to the geniuses at SO for some help. Any help would be most appreciated, (de)serialization with JSON and XML with json.org, Jackson, and JAXB has turned into a black and bottomless pit that has consumed almost a month of my life.

My first impression was that I wasn't properly specifying the eclipselink runtime (as described here) but that didn't produce a solution.

Stacktrace:

Exception in thread "main" javax.xml.bind.PropertyException: name: eclipselink.media-type value: application/json   
  at org.eclipse.persistence.jaxb.JAXBMarshaller.setProperty(JAXBMarshaller.java:528)
  at com.dualoutput.DualOutput.main(DualOutput.java:20)

SSCCE

回答1:

You need be sure you are using EclipseLink 2.4.0 or above. The current version is 2.5.0 which can be downloaded at (or obtained from Maven Central):

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

---

UPDATE

MOXy also offers the following convenience classes to access the extension properties:

• org.eclipse.persistence.jaxb.JAXBContextProperties
• org.eclipse.persistence.jaxb.MarshllerProperties
• org.eclipse.persistence.jaxb.UnmarshallerProperties

This means you could do the following:

marshaller.setProperty(MarshallerProperties.MEDIA_TYPE, "application/json");