How do I convert Json object to a Java object dynamically

Question

Here is my use case:

I have these classes on the serverside.

class Individual {
  protected String uri;
  protected int id;
}

class Person extends Individual {
  // Person properties like names, address etc
  String type = "Person";
}

class Role extends Individual {
  // Role properties like name, title etc
  String type = "Role";
}

class Organization extends Individual {
  // Org properties like name name, address etc
  String type = "Organization";
}

I have a class say Action like below.

class Action {
  String performedBy; // This can be any Individual
}

I have a controller that accepts an Action. I want the Individual to be correctly assigned depending on what the client sends. How should my Action & other classes be defined to achieve this?

if I send the following, I want performedBy to be a Person.

{
 "id": 10,
 "uri":"uri_blah",
 "lastname": "last_name",
 "type":"Person"
}

Possible duplicate of How to parse JSON in Java

MikaelF
– MikaelF

2017-02-08 04:33:26 +00:00
Commented Feb 8, 2017 at 4:33 — MikaelF
– MikaelF, Commented Feb 8, 2017 at 4:33

Zbynek Vyskovsky - kvr000 · Accepted Answer · 2017-02-08 04:50:46Z

4

There is @JsonType annotation which allows to serialize the type into property:

@JsonTypeInfo(
   use = JsonTypeInfo.Id.NAME, 
   include = JsonTypeInfo.As.PROPERTY, 
   property = "type")
@JsonSubTypes({ 
   @Type(value = Person.class, name = "Person"), 
   @Type(value = Role.class, name = "Role") 
   // ...
 })
 public abstract class Individual {
    // ...
 }

answered Feb 8, 2017 at 4:50

Zbynek Vyskovsky - kvr000

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1 Comment

rtnyc Over a year ago

This answer is very useful, but unfortunately I can't give you +1 yet, cheers

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