How to create a custom deserializer in Jackson for a generic type?

Question

Imagine the following scenario:

class  Foo {
    ....
}

class Bar {
    Foo foo;
}

I want to write a cu

Answer 1

If the target itself is a generic type then property will be null, for that you'll need to get the valueTtype from the DeserializationContext:

@Override
public JsonDeserializer createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException {
    if (property == null) { //  context is generic
        JMapToListParser parser = new JMapToListParser();
        parser.valueType = ctxt.getContextualType().containedType(0);
        return parser;
    } else {  //  property is generic
        JavaType wrapperType = property.getType();
        JavaType valueType = wrapperType.containedType(0);
        JMapToListParser parser = new JMapToListParser();
        parser.valueType = valueType;
        return parser;
    }
}