CODEWITHSUNDEEP
javajaxb
Dinesh Pillay
Dinesh Pillay

Reputation: 93

@XmlJavaTypeAdapter w/ Inheritance

I have an XmlJavaTypeAdapter defined for each Exception in my exception heirarchy. I use a wrapper object for marshaling the exceptions as below:-

@XmlRootElement
public Wrapper<T extends BaseException> {
    T exception;
}

The exceptions:-

@XmlJavaTypeAdapter(BaseExceptionAdapter.class) {
public class BaseException extends RuntimeException {
}


@XmlJavaTypeAdapter(DerivedExceptionAdapter.class) {
public class DerivedException extends BaseException {
}

When I try marshaling a wrapper object, JAXB by default always calls the BaseExceptionAdapter even if the actual exception is of type DerivedException. How can I force it to look for the instance type of the exception rather than the reference type.

Just to add, package-info / jaxb.index etc are as excepted.

Upvotes: 7

Views: 806

Answers (2)

Ross Judson
Ross Judson

Reputation: 1142

Looks like you need an @XmlElementRef on your T field, to tell JAXB to look that up dynamically.

Upvotes: 1

EdC
EdC

Reputation: 2349

Do you have all your exception sub-types listed in package-info / jaxb.index / newInitialContext(...)?

JAX-B will look at the instance type, but I believe the sub-types need to be registered with JAX-B. It won't discover the XMLJavaTypeAdapter annotation at runtime you have to explicitly register each sub-class with JaxB.

This can also be accomplished with the @XmlSeeAlso annotation from a class that is registered with JAX-B.

Upvotes: 0

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