Deserializing Array of arrays from json

Question

I am trying to deserialize an array of array of Strings using ObjectMapper. The input has the following structure: [["key", "value"], ["Car", "1"], ["SUV", "1.1"]]

I have tried to de-serialize this by using the following method:

JavaType itemType = objectMapper.getTypeFactory().constructCollectionType(List.class, Array.class);
List<T> mutableList = objectMapper.readValue(json.or("[]"), itemType);

However, the compiler complains of raw use of parameterized class. Could someone please explain how to serialize such an input ?

Are you using Jackson?

Abra
– Abra

2020-02-26 02:48:30 +00:00
Commented Feb 26, 2020 at 2:48 — Abra
– Abra, Commented Feb 26, 2020 at 2:48
Yes. I'm using Jackson. The answer by Deadpool solves it.

Vishnu-Pedireddi
– Vishnu-Pedireddi

2020-02-26 19:09:50 +00:00
Commented Feb 26, 2020 at 19:09 — Vishnu-Pedireddi
– Vishnu-Pedireddi, Commented Feb 26, 2020 at 19:09

Abra · Accepted Answer · 2020-02-27 02:34:38Z

1

The JSON you have is an Array with Array of string object and error message indicates to specify the exact type, so I would suggest to use TypeReference with exact type

List<List<String>> listCar = objectMapper.readValue(json.or("[]"), new TypeReference<List<List<String>>>(){});

edited Feb 27, 2020 at 2:34

Abra

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answered Feb 26, 2020 at 3:02

Ryuzaki L

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1 Comment

Vishnu-Pedireddi Over a year ago

Much appreciated ! - Thanks

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