question

Evan:

We are in-progress on writing a Getting Started Guide for the Java SDK.

I can't link to it yet, because it's in review, but I can share the code sample:

import java.util.concurrent.*;
import java.util.*;

import com.playfab.PlayFabErrors.*;
import com.playfab.PlayFabSettings;
import com.playfab.PlayFabClientModels;
import com.playfab.PlayFabClientAPI;

public class GettingStarted
{
    private static boolean _running = true;

    public static void main(String[] args) {
        PlayFabSettings.TitleId = "144";

        PlayFabClientModels.LoginWithCustomIDRequest request = new PlayFabClientModels.LoginWithCustomIDRequest();
        request.CustomId = "GettingStartedGuide";
        request.CreateAccount = true;

        FutureTask<PlayFabResult<com.playfab.PlayFabClientModels.LoginResult>> loginTask = PlayFabClientAPI.LoginWithCustomIDAsync(request);
        loginTask.run();

        while (_running) {
            if (loginTask.isDone()) { // You would probably want a more sophisticated way of tracking pending async API calls in a real game
                OnLoginComplete(loginTask);
            }

            // Presumably this would be your main game loop, doing other things
            try {
                Thread.sleep(1);
            } catch(Exception e) {
                System.out.println("Critical error in the example main loop: " + e);
            }
        }
    }

    private static void OnLoginComplete(FutureTask<PlayFabResult<com.playfab.PlayFabClientModels.LoginResult>> loginTask) {
        PlayFabResult<com.playfab.PlayFabClientModels.LoginResult> result = null;
        try {
            result = loginTask.get(); // Wait for the result from the async call
        } catch(Exception e) {
            System.out.println("Exception in PlayFab api call: " + e); // Did you assign your PlayFabSettings.TitleId correctly?
        }

        if (result != null && result.Result != null) {
            System.out.println("Congratulations, you made your first successful API call!");
        } else if (result != null && result.Error != null) {
            System.out.println("Something went wrong with your first API call.");
            System.out.println("Here's some debug information:");
            System.out.println(CompileErrorsFromResult(result));
        }

        _running = false; // Because this is just an example, successful login triggers the end of the program
    }

    // This is a utility function we haven't put into the core SDK yet.  Feel free to use it.
    private static <RT> String CompileErrorsFromResult(PlayFabResult<RT> result) {
        if (result == null || result.Error == null)
            return null;

        String errorMessage = "";
        if (result.Error.errorMessage != null)
            errorMessage += result.Error.errorMessage;
        if (result.Error.errorDetails != null)
            for (Map.Entry<String, List<String>> pair : result.Error.errorDetails.entrySet() )
                for (String msg : pair.getValue())
                    errorMessage += "\n" + pair.getKey() + ": " + msg;
        return errorMessage;
    }
}

The example code kicks off the api call in a thread, saves a reference to the FutureTask instance, and calls isDone() on it periodically until the threaded call is complete.
You SHOULD ABSOLUTELY NOT cause any of the API call work to happen on the main thread as it'll possibly throw an exception, or otherwise it'll definitely lock up your program until the API call completes.

The new Getting Started Guides will contain this code once they're published, but this is a sneak peek of the code.