Gson is intended for usage with pure Java and doesn’t interpret Kotlin primary constructors properly. If there is a default no-argument constructor, it is called (in your case, there is one: the primary constructor with default value “” for someString), otherwise Gson calls no constructor at all. Then Gson sets the property values (also, it … Read more
I was facing the same issue. Here is my solution via custom deserialization: new GsonBuilder().registerTypeAdapter(Date.class, new DateDeserializer()); private static final String[] DATE_FORMATS = new String[] { “MMM dd, yyyy HH:mm:ss”, “MMM dd, yyyy” }; private class DateDeserializer implements JsonDeserializer<Date> { @Override public Date deserialize(JsonElement jsonElement, Type typeOF, JsonDeserializationContext context) throws JsonParseException { for (String format … Read more
Here is an example that I made for Long type. This is a better option: public class LongTypeAdapter extends TypeAdapter<Long> { @Override public Long read(JsonReader reader) throws IOException { if (reader.peek() == JsonToken.NULL) { reader.nextNull(); return null; } String stringValue = reader.nextString(); try { Long value = Long.valueOf(stringValue); return value; } catch (NumberFormatException e) { … Read more
Gson gson = new GsonBuilder() .setDateFormat(“yyyy-MM-dd’T’HH:mm:ss”) .create(); RestAdapter restAdapter = new RestAdapter.Builder() .setEndpoint(API_BASE_URL) .setConverter(new GsonConverter.create(gson)) .build(); Or the Kotlin equivalent: val gson = GsonBuilder().setDateFormat(“yyyy-MM-dd’T’HH:mm:ss”).create() RestAdapter restAdapter = Retrofit.Builder() .baseUrl(API_BASE_URL) .addConverterFactory(GsonConverterFactory.create(gson)) .build() .create(T::class.java) You can set your customized Gson parser to retrofit. More here: Retrofit Website Look at Ondreju’s response to see how to implement this … Read more
I believe you have two options here. If you have Import-Package: com.google.gson;version=”[2.3,3)” in your MANIFEST.MF, this means that you want some package to be imported from a deployed bundle, not from an embedded jar. In this case, you should first deploy gson-2.3.1.jar bundle (copy this file to the deploy folder), and then deploy your bundle. … Read more
Here is a generic solution that works for all cases where only interface is known statically. Create serialiser/deserialiser: final class InterfaceAdapter<T> implements JsonSerializer<T>, JsonDeserializer<T> { public JsonElement serialize(T object, Type interfaceType, JsonSerializationContext context) { final JsonObject wrapper = new JsonObject(); wrapper.addProperty(“type”, object.getClass().getName()); wrapper.add(“data”, context.serialize(object)); return wrapper; } public T deserialize(JsonElement elem, Type interfaceType, JsonDeserializationContext context) … Read more
You don’t need to switch to Jackson. Gson 2.1 introduced a new TypeAdapter interface that permits mixed tree and streaming serialization and deserialization. The API is efficient and flexible. See Gson’s Streaming doc for an example of combining tree and binding modes. This is strictly better than mixed streaming and tree modes; with binding you … Read more
As Gson documentation says: Gson can serialize static nested classes quite easily. Gson can also deserialize static nested classes. However, Gson can not automatically deserialize the pure inner classes since their no-args constructor also need a reference to the containing Object which is not available at the time of deserialization. You can address this problem … Read more
Try: <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.1</version> <scope>provided</scope> </dependency> I have edited my comment and added the scope. The default scope is compile, meaning that the dependency is not present at runtime. For this, you use the provided scope. More about scopes in maven dependencies on Apache’s Introduction to Maven Dependencies. Hope this resolves your issue. P.S.: … Read more
I finally solved it! // GSON GsonBuilder gsonBilder = new GsonBuilder(); gsonBilder.registerTypeAdapter(Conteudo.class, new InterfaceAdapter<Conteudo>()); gsonBilder.setPrettyPrinting(); Gson gson =gsonBilder.create(); String str2send = gson.toJson(message); Mensagem msg_recv = gson.fromJson(str2send,Mensagem.class); Note that: “registerTypeAdapter(AbstractClass.class, new InterfaceAdapter());” by AbstractClass.class i mean the class that you are implementing in my case it was Conteúdo that could be ConteudoTweet or ConteudoUserSystem and so … Read more