In JAXB, you can set an XmlAdapter for a specific subtype of an element by using the @XmlJavaTypeAdapter annotation. Here's how you can do it:

  1. Create your custom XmlAdapter by extending the XmlAdapter class and implementing the necessary conversion methods. For example:
java
public class MyCustomAdapter extends XmlAdapter<String, MySubType> { @Override public MySubType unmarshal(String value) throws Exception { // Conversion logic from XML representation to MySubType object } @Override public String marshal(MySubType value) throws Exception { // Conversion logic from MySubType object to XML representation } }
  1. Apply the @XmlJavaTypeAdapter annotation to the property in the parent class that references the subtype. Specify the adapter class as the value of the annotation. For example:
java
public class ParentClass { @XmlElement @XmlJavaTypeAdapter(MyCustomAdapter.class) private MySubType subtype; // Getters and setters }

With this configuration, the MyCustomAdapter will be used only for marshalling and unmarshalling the MySubType object when it is encountered in the ParentClass. Other subtypes of the element will not be affected by this adapter.

Make sure to adjust the types (MyCustomAdapter, MySubType, etc.) to match your specific scenario.

By using the @XmlJavaTypeAdapter annotation, you can control the conversion behavior for specific subtypes of an element in JAXB.

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