Description
When the return type of a JAX-RS annotated method is an interface, and the interface has a @JavaXmlTypeAdapter on it, the JAXBElementProvider should find that adapter so it can do the appropriate conversion. Per Sergey:
"At the moment JAXBElementProvider is capable of working with @XmlJavaTypeAdapter but it does not check the interfaces. The workaround : add @XmlJavaTypeAdapter as a method annotation to getAll() or to BaseballCardImpl. [...] but I can see that the fix can be trivial in this case "