SpringBoot deserialize a JSON array in Java using Jackson

Question

I am currently writing a SpringBoot application that retrieves a JSON array from an external API. The part of the JSON I need looks like:

{
"users": [
    "id": 110,
    "name": "john"
  ]
}

In my Controller I am doing the following:

 ResponseEntity<Users> response = restTemplate
    .exchange(url, headers, Users.class);

return response

I then have a Users class that looks like:

@JsonProperty("id")
public String id;
@JsonProperty("name")
public string name;

How can I access the information inside the JSON array?

Thanks in advance.

GnanaJeyam · Accepted Answer · 2019-07-07 18:35:36Z

1

Instead of loading into a POJO based on your return type you need to accept list of Users.

You cannot accept List of user class in ResponseEntity you need to first cast into object class.

ResponseEntity<Object> response = restTemplate .exchange(url, headers, Object.class);

Then you need to convert it into list of users.

List<Users> usersList = (List<Users>) response.getBody();

answered Jul 7, 2019 at 18:35

GnanaJeyam

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Comments

Fana Sithole · Accepted Answer · 2019-07-07 17:13:45Z

1

The JSON you posted above is not correct. It needs to be:

{
   "users": [
       {
          "id": 110,
          "name": "john"
       }
    ]
}

and whatever object is used needs a list of Users.

The other thing is you restTemplate call is wrong, you are expecting the call to return ResponseEntity<Opportunities> class yet when in your restTemplate you are giving it the User class and that will return ResponseEntity<User> instead

answered Jul 7, 2019 at 17:13

Fana Sithole

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1 Comment

user2047296 Over a year ago

Sorry these were editing mistakes when posting the code. They do match what you have posted.

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