code: public void getCharacterSpecialization(String API, String name, Callback<CharacterSpecialization> callback) throws GuildWars2Exception, NullPointerException {
  		isParamValid(new ParamChecker(ParamType.API, API), new ParamChecker(ParamType.CHAR, name));
  		gw2API.getCharacterSpecialization(name, API).enqueue(callback);
  	}
docs: For more info on Character Specialization API go <a href="https://wiki.guildwars2.com/wiki/API:2/characters#Specialization">here</a><br/>
  Give user the access to {@link Callback#onResponse(Call, Response)} and {@link Callback#onFailure(Call, Throwable)} methods for custom interactions
  
  @param API      API key
  @param name     character name
  @param callback callback that is going to be used for {@link Call#enqueue(Callback)}
  @throws GuildWars2Exception  invalid API key | empty character name
  @throws NullPointerException if given {@link Callback} is empty
  @see CharacterSpecialization character specialization info