Jackson. Deserialeze lists with different generic types

I want deserialize List<Contact<Contact>> with custom deserialezer using jackson library.
List<<Document>Document> and List<<Good>Good> should deserialize by default.

There is my class

public class Application implements Serializable {
    //other fields

    private List<Document> documents;
    private List<Contact> contacts;
    private List<Good> goods;
}

But I can't change it to add annotations. So I use mixin

public abstract class ApplicationMixin {
	@JsonProperty("contactId")
	private List<Contact> contacts;
}

Custom deserializer:

@JsonComponent
public class ContactsDeserializer extends JsonDeserializer<List<Contact>> {
	@Override
	public List<Contact> deserialize(JsonParser parser, DeserializationContext context) throws IOException {
		List<Contact> contacts = new ArrayList<>();

        //some logic

       return contacts;
   }
}

And during deserialization all lists try to use this custom deserializer.
But I want it only for contacts.
What can I do for this?

The observed behavior is caused by the type erasure. On runtime, Jackson cannot tell the difference between List<Contact>, List<Document> or any other List, so it applies the ContactsDeserializer to all of them. You will need to be more precise about what the deserializer should be applied to.

You can try the following:

1. remove @JsonComponent annotation from the ContactsDeserializer
2. in the ApplicationMixin, add @JsonDeserialize(using = ContactsDeserializer.class) to the contacts field.

public abstract class ApplicationMixin {
    @JsonProperty("contactId")
    @JsonDeserialize(using = ContactsDeserializer.class)
    private List<Contact> contacts;
}

Alternatively, you might consider creating a custom deserializer for the Contact class instead of the List<Contact>. If it's possible depends on the input JSON format.