How convert an annotation (all its diff properties) into a JSON object using Jackson/ObjectMapper?

Question

I have an annotation and during its runtime use on a method, I want to convert it 9and all its property values) into a JSON object.

The annotation:

public @interface MyAnnotation {
    String name();
    Integer age();
}

Use of it:

public class MyClass {
    @MyAnnotation(name = "test", age = 21)
    public String getInfo()
    { ...elided... }
}

When using reflection on an object of type MyClass and getting the annotation from its getInfo method, I would like to be able to convert the annotation to JSON. But it doesn't have any fields (since @interfaces can't have fields), so is there a way to configure an ObjectMapper to use the methods as properties instead?

//This just prints {}
new ObjectMapper().writeValueAsString(method.getAnnotation(MyAnnotation.class));

Answer 1

Found the answer:

Use @JsonGetter and pass it the name of the field you want it to represent.

Example:

public @interface MyAnnotation {

    @JsonGetter(value = "name")
    String name();

    @JsonGetter(value = "age")
    Integer age();
}

This will output as the json: {"name":"test","age":21}