How to avoid deserialize empty JSON Array elements from JSON String while using Jackson

Question

I am using Jackson 2 library and I am trying to deserilize a JSON response, which looks like:

{
    "employee": [
    {},
    {
        "Details": [
            {
                "Name": "value",
                "Lastname": "value"
            }
        ]
    }
]}

For some reasons, there is an empty element at my employee array. Is it possible to discard that element and avoid to deserialize it, during deserialization process? Currently, my code deserialize the empty employee as an Employee POJO class with null fields.

My code looks like:

ObjectMapper mapper = new ObjectMapper();
Empoyee[] array = mapper.readValue(json, Empoyee[].class);

PS. I cannot touch the JSON response. It is what it is...

Michał Ziober · Accepted Answer · 2019-03-04 22:49:07Z

1

You need to write custom deserialiser or filter out empty objects after deserialisation process. Second approach sounds much easier because except custom deserialiser for bean you need to extend already implemented deserialiser for arrays (com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer) and filter out null or empty beans.

1 Comment

Konstantinos Raptis Over a year ago

Your answer solves my case with two different ways. I will accept your answer as a solution to my problem. Appart from the fact that the second approach is easier, can you elaborate a little more why is it preferable?

vaquar khan · Accepted Answer · 2019-03-04 20:13:41Z

0

Hope it will help you .

ObjectMapper mapper = new ObjectMapper();
mapper.setSerializationInclusion(Include.NON_NULL);
mapper.setSerializationInclusion(Include.NON_EMPTY);

Or

ObjectMapper mapper = new ObjectMapper ().configure(
        DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false).setSerializationInclusion(
                JsonInclude.Include.NON_NULL);

answered Mar 4, 2019 at 20:13

vaquar khan

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Comments

Ido Segal · Accepted Answer · 2019-03-04 21:42:47Z

0

First, please make sure that you have setters, getters and constructors, after that, you can use the following:

Employee employee = mapper.readValue(yourJson, Employee.class);

edited Mar 4, 2019 at 21:42

answered Mar 4, 2019 at 19:58

Ido Segal

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1 Comment

Konstantinos Raptis Over a year ago

I have constructors at my POJO classes. The code above creates the employee object. It has nothing to do with the question, which is how we discard the empty object during deserialization process.

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