Jackson Not Overriding Getter with @JsonProperty

java json serialization jackson getter
tt_Gantz picture tt_Gantz · Sep 29, 2015 · Viewed 52.4k times · Source

JsonProperty isn't overriding the default name jackson gets from the getter. If I serialize the class below with ObjectMapper and jackson I get

{"hi":"hello"}

As you can see the JsonProperty annotation has no effect

class JacksonTester {
    String hi;

    @JsonProperty("hello")
    public String getHi() {
        return hi;
    }
}

Putting @JsonProperty on the String itself doesn't work either. The only way it seems that I can change the name is by renaming the getter, the only problem is that it then will always be lowercase for the first letter

Answer

tt_Gantz picture tt_Gantz · Sep 29, 2015

The problem was that I was using both the old and new jackson libraries

i.e. before I had import org.codehaus.jackson.annotate.JsonProperty; Which I had to change to below, to be consistent with the library I was using.

Since I was using maven that also meant updating my maven dependencies. import com.fasterxml.jackson.annotation.JsonProperty;

For it to work, I needed the @JsonProperty annotation on the getter (putting it on the object didn't work)

I found the answer here (thanks to francescoforesti) @JsonProperty not working as expected

Related questions

How do I use a custom Serializer with Jackson?

I have two Java classes that I want to serialize to JSON using Jackson: public class User { public final int id; public final String name; public User(int id, String name) { this.id = id; this.name = name; } } public class Item { …

Read More
Jackson JSON custom serialization for certain fields

Is there a way using Jackson JSON Processor to do custom field level serialization? For example, I'd like to have the class public class Person { public String name; public int age; public int favoriteNumber; } serialized to the follow JSON: { "name": "…

Read More
Why when a constructor is annotated with @JsonCreator, its arguments must be annotated with @JsonProperty?

In Jackson, when you annotate a constructor with @JsonCreator, you must annotate its arguments with @JsonProperty. So this constructor public Point(double x, double y) { this.x = x; this.y = y; } becomes this: @JsonCreator public Point(@JsonProperty("x") double x, @…

Read More