How to generate JaxB-Classes with java.util.Optional?

Question

I use the jaxb2-maven-plugin to generate JaxB-Classes from a given XSD. It works fine. But now I want to use java.util.Optional in the generated Classes. But JaxB generated the

Answer 1

Maybe you could find something more generic but i'm not sure if this is possible. Anyway you can still define custom Adapter for types you want to be optional.

Here is an example of Integer

First, create an Adapter

public final class IntegerOptionalAdapter extends OptionalAdapter<Integer>
{
} 

Then use this adapter in your binding

@XmlAttribute
@XmlJavaTypeAdapter(IntegerOptionalAdapter.class)
private Optional<Integer> someInteger;