Serialization fails when serializing same object

[Ihromant]

Simple code snippet fails:

public class Client {
    public static void main(String[] args) {
        System.out.println(JSON.serialize(Arrays.asList(Field.of(0, 0), Field.of(0, 0))).stringify());
    }

    @JsonPersistable
    public static class Field {
        public static final int WIDTH = 10;
        public static final int HEIGHT = 10;
        public static final Field[] CACHE = IntStream.range(0, WIDTH * HEIGHT)
                .mapToObj(i -> new Field(i / HEIGHT, i % HEIGHT)).toArray(Field[]::new);
        private int x;
        private int y;

        public Field() {}

        public Field(int x, int y) {
            this.x = x;
            this.y = y;
        }

        public int getX() { return x; }

        public void setX(int x) { this.x = x; }

        public int getY() { return y; }

        public void setY(int y) { this.y = y; }

        public static Field of(int x, int y) {
            return CACHE[x * HEIGHT + y];
            // this works return new Field(x, y);
        }
    }
}

with

Uncaught Error: Java exception thrown at $rt_exception (classes.js:228) at $rt_throw (classes.js:220) at otfjs_JsonSerializerContext_touch (JsonSerializerContext.java:43) at otfjs_JsonSerializerContext.$touch (classes.js:535) at otfjs_JsonSerializer$proxy$4_106_0_serialize (JsonSerializerEmitter.java:220) at Object.$serialize (classes.js:540) at otfj_JSON_serialize (JSON.java:53) at otfjs_JsonSerializer$proxy$4_7_0_serialize (JsonSerializerEmitter.java:425) at Object.$serialize (classes.js:540) at otfjs_ListSerializer_serializeNonNull (ListSerializer.java:34)

I tried to reproduce it in test, but from IDEA it seems that it runs serialization with Jackson (which obviously works), but from console with "mvn clean install" SerializerTest just hangs in console and doesn't finish.

[ScraM-Team]

Have you tried wrapping the List in a new class that implements JsonPersistable before serializing? List itself doesn't implement JsonPersistable and may not be supported.