How to use

registerTypeAdapter

method

in

camundajar.com.google.gson.GsonBuilder

public static Gson createGsonMapper() {
 return new GsonBuilder()
  .serializeNulls()
  .registerTypeAdapter(Map.class, new JsonDeserializer<Map<String,Object>>() {
   public Map<String, Object> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
    Map<String, Object> map = new HashMap<>();
    for (Map.Entry<String, JsonElement> entry : getObject(json).entrySet()) {
     if (entry != null) {
      String key = entry.getKey();
      JsonElement jsonElement = entry.getValue();
      if (jsonElement != null && jsonElement.isJsonNull()) {
       map.put(key, null);
      } else if (jsonElement != null && jsonElement.isJsonPrimitive()) {
       Object rawValue = asPrimitiveObject((JsonPrimitive) jsonElement);
       if (rawValue != null) {
        map.put(key, rawValue);
       }
      }
     }
    }
    return map;
   }
  })
  .create();
}

public static Gson createGsonMapper() {
 return new GsonBuilder()
  .serializeNulls()
  .registerTypeAdapter(Map.class, new JsonDeserializer<Map<String,Object>>() {
   public Map<String, Object> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
    Map<String, Object> map = new HashMap<>();
    for (Map.Entry<String, JsonElement> entry : getObject(json).entrySet()) {
     if (entry != null) {
      String key = entry.getKey();
      JsonElement jsonElement = entry.getValue();
      if (jsonElement != null && jsonElement.isJsonNull()) {
       map.put(key, null);
      } else if (jsonElement != null && jsonElement.isJsonPrimitive()) {
       Object rawValue = asPrimitiveObject((JsonPrimitive) jsonElement);
       if (rawValue != null) {
        map.put(key, rawValue);
       }
      }
     }
    }
    return map;
   }
  })
  .create();
}