Multi tool use

Clash Royale CLAN TAG

Forcing Jackson to deserialize specific property to specific primitive type

I'm using jackson 2.9.6 I have a object that I want to serialize and Deserialize. Here is a class Post

jackson 2.9.6

Post

Post.java

public class Post {

private Long id;
private String name;
private int count;

private List<Comment> commentList;

// Getter and setter

}

public class Comment{

private Long id;
private String text;
private int count;

// Getter and setter

}


JSON Data

{
"id" : 123,
"name" : "azeem",
"count" : 1
"commentList" : [
{
"id" : 312,
"text" : "simple comment",
"count" : 3
},
{
"id" : 31221231231231,
"text" : "simple comment 2",
"count" : 1
}
]
},

"id" : 123127877186786,
"name" : "arfan",
"count" : 5
"commentList" : [
{
"id" : 312,
"text" : "simple comment",
"count" : 3
},
{
"id" : 31221231231231,
"text" : "simple comment 2",
"count" : 1
}
]
}


I'm using ObjectMapper to read and write, like this.

ObjectMapper

For Write

objectMapper.writeValue(fileDir, postObject);


For Read

objectMapper.readValue(savedFileDir, Post.class); // Error can't cast int to long


As you can see there is error can't cast int to long post['id'] and same in commentList this is because in Json Data first id is 123 So jackson consider it as int and try to save it on Long id

commentList

id

jackson

int

Long id

I see an answer on StackOverFlow that use DeserializationFeature.USE_LONG_FOR_INTS But I can't use it because there is another property count which I need it in int.

DeserializationFeature.USE_LONG_FOR_INTS

count

int

If I use DeserializationFeature.USE_LONG_FOR_INTS it show me error that Long can't cast to int post['count'] and same as commentList

DeserializationFeature.USE_LONG_FOR_INTS

commentList

I want to ask that Is there any way I can convert specific property to specific primitive type. For example in this I want id property always in Long in both Post and Comment. Other all properties are fine.

id

Long

Post

Comment

Can you please let me know how can I do that.

id

long

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