I am using Json-B that implemented by Eclipse Yasson. I want to serialize my custom Map that there is a value is an instance of array of String. I got this error:

Caused by: java.lang.IllegalArgumentException: Type class [Ljava.lang.String; is not supported.
at org.eclipse.parsson.MapUtil.handle(MapUtil.java:75)
at org.eclipse.parsson.JsonObjectBuilderImpl.populate(JsonObjectBuilderImpl.java:200)
at org.eclipse.parsson.JsonObjectBuilderImpl.(JsonObjectBuilderImpl.java:66)
at org.eclipse.parsson.JsonProviderImpl.createObjectBuilder(JsonProviderImpl.java:187)
at jakarta.json.Json.createObjectBuilder(Json.java:303)
at com.appslandia.common.jose.JsonbMapAdapter.adaptToJson(JsonbMapAdapter.java:56)
at com.appslandia.common.jose.JsonbMapAdapter.adaptToJson(JsonbMapAdapter.java:39)
at org.eclipse.yasson.internal.serializer.AdaptedObjectSerializer.serialize(AdaptedObjectSerializer.java:62)

I check on parsson.MapUtil.handle and I found out this method does NOT support array objects?

My suggession fix:

static JsonValue handle(Object value, JsonContext jsonContext) {
    if (value == null) {
        return JsonValue.NULL;
    
    // ... 
    } else if (value instanceof Array) {
        Collection<?> collection = toCollection(value);
        JsonArrayBuilder jsonArrayBuilder = new JsonArrayBuilderImpl(collection, jsonContext);
        return jsonArrayBuilder.build();
    }

    throw new IllegalArgumentException(String.format("Type %s is not supported.", value.getClass()));
}

    static Collection<?> toCollection(Object arr) {
    	int len = Array.getLength(arr);
    	List<Object> list = new ArrayList<>(len);
    
    	for (int i = 0; i < len; i++) {
    	    list.add(Array.get(arr, i));
    	}
    	return list;
    }

If I use list of String instead array of String, my custom map was serialized fine.

Please notes that, If I use Gson or Jackson, my custom map was serialized fine.