How to merge JsonIgnoreProperties with superclass?

Question

I have two classes:

@JsonIgnoreProperties(values="foo", allowGetters = true)
public class Parent {
  String foo;
  String bar;
}

@JsonIgnoreProperties(values="alice", allowGetters = true)
public class Child extends Parent {
  String alice;
  String bob;
}

This results in a class Child where the attribute foo is not ignored (for setting). So I assume JsonIgnoreProperties of Child overrides JsonIgnoreProperties of Parent.

But I need a way to merge JsonIgnoreProperties of Child and JsonIgnoreProperties of Parent. How to do this? TIA!

You can set ignoreUnknown = true which will ignore any or specify multiple using value = { "alice", "foo"} on parent — karen, Nov 09 '18 at 12:21
@karen I do not want to ignore unknown, because I want to avoid setting some (existing) properties by the caller of a REST API. — t777, Nov 09 '18 at 12:22

score 1 · Answer 1 · answered Nov 09 '18 at 12:54

Since you've redefined the annotation in Child class it overrides the one defined in Parent.

I know 2 Ways you could solve this, both of which are not straight forward.

In the Child class, instead of using @JsonIgnoreProperties make use of @JsonIgnore on the Getters of the Properties you would like to Ignore. This will make sure you're not overriding the Parent Annotation.
If you still want to make use of @JsonIgnoreProperties, then Add a Custom JsonFilter and handle the annotations parsing manually in Runtime (Reflections) by looking if any of the hierarchical parent classes has a JsonIgnoreProperties then skip the assignment.

Thanks. Regarding the second point: Is it sufficient to use a custom `JsonFilter` or do I need a customer deserializer? — t777, Nov 09 '18 at 20:19

score 0 · Accepted Answer · answered Nov 11 '18 at 15:39

0

I solved the problem with a custom BeanDeserializerModifier.

see here: Jackson Dynamic filtering of properties during deserialization

answered Nov 11 '18 at 15:39

t777

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How to merge JsonIgnoreProperties with superclass?

2 Answers2