Json generated through Jackson should be in sorted order of the Json elements value

Question

I am trying to generate JSON string from Map in sorted order of json element's value. Here is my JSON

"customer": {
      "id": "168252733",
      "firstName": "OTP",
      "lastName": "KPI",
      "contact": {
        "emailAddress": "nona.adams1@gmail.com",
        "phone": [
          {
            "number": "2567775065",
            "type": "primary"
          },
          {
            "number": "2567775065",
            "type": "secondary"
          }
        ]
      }
    }

This Json can contains multiple customer records but I want the json to be generated should be in sorted order of either firstname, lastname or email depending on the user preference.

I am new to JACKSON, don't know how to implement it. Can anybody help me on this. Thanks in Advance.

The easiest way would be to sort your List or array before you serialize it. — Jo Peyper, Feb 22 '17 at 05:32
Thanks for the reply Jo. But I don't want to sort the list. Can't it be done by Jackson anyway. — Abhishek Kumar Maurya, Feb 22 '17 at 05:45
I guess you could use a [customer serializer](http://wiki.fasterxml.com/JacksonHowToCustomSerializers) to copy and sort the list during serialization. The trick will be trying to get access to your users preferences inside the serializer. — Jo Peyper, Feb 22 '17 at 05:49

ravthiru · Accepted Answer · 2017-02-22T06:22:09.357

Option 1 :

Simple way will be to use Arrays.sort(T[] a, Comparator<? super T> c) to sort the List of Customers based on user preference before serialize.

You need to create Comparators for each user preference and then use Arrays.sort(customerList, firstNameComparator)

Option 2 :

If you want sorted List of Customers from JSON then you need to register Custom Deserializer and your CustomerListDeserializer generate sorted list of Customers

  SimpleModule simpleModule = new SimpleModule().addDeserializer(CustomerList.class, new CustomerListDeserializer());
        mapper.registerModule(smipleModule);

Option 3 :

First Deserialize into to List of Customer Objects and then apply sort.

Json generated through Jackson should be in sorted order of the Json elements value

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