CODEWITHSUNDEEP
javajsongenericsserializationgson
Baschdl
Baschdl

Reputation: 435

Serialization of ArrayList (generic types) with GSON

I want to serialize a java object to JSON with Google's GSON library. It works fine except when a ArrayList occurs. GSON isn't able to handle the generic type of the ArrayList. @Yavor Georgiev described a solution with the registerSerializer(...) method, but this method doesn't exist in the new releases.

gson.registerSerializer(ArrayList.class, new CollectionSerializer<Object>());

http://hashtagfail.com/post/44606137082/mobile-services-android-serialization-gson

In my case the ArrayList is nested in a class three layers under the object, which is passed to toJSON(...).

Does anyone know how to solve this problem?

The structure is like this:

public class Data() {
    @Expose
    privat int number = 8;
    @Expose
    private Foo foo = new Foo();
}

public class Foo() {
    @Expose
    private Bar bar = new Bar();
}

import java.awt.Point;
public class Bar() {
    @Expose
    ArrayList<Point> list = new ArrayList()<>;
}

Upvotes: 2

Views: 456

Answers (1)

Raghu K Nair
Raghu K Nair

Reputation: 3932

Have you tried registering an Adapter. 

new GsonBuilder().registerTypeAdapter(Object.class, new JsonSerializer<Object>() {
            @Override
            public JsonElement serialize(Object src, Type typeOfSrc, JsonSerializationContext context) {
                return context.serialize(src);
            }
        })

Upvotes: 1

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