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Authenticate to autodesk

We are developing a Java application that is supposed to show models from users store.
initially, I'm trying to allow users to login using their autodesk account, and check if they are entitled to access my app.
I couldn't find any good example to show how it is done, I just want to confirm that what I will be doing is the recommended thing or if there is better options.
First, on app start, I will show an embedded webbrowser that will open
"https://developer.api.autodesk.com/authentication/v1/authorize?response_type=code&client_id=XXX&redirect_uri=XXX&scope=XXX"
the app will get the url from our server (so not saved locally) and the call back is pointing to an api on our server. then as user login and consent, will get the code from the url, close the login dialog and continue to get the bearer token using plain rest apis to /authentication/v1/gettoken.
As I said, not 100% sure if this is approved way or not or even if it is doable or not. so thought to check before we implement it.
After that I will just use rest apis to browse and get the model.
any thoughts or complains ?
Thanks in advance

Rest assured that the workflow being proposed here is actually orthodoxical and well “approved” by our official tutorials:
https://forge.autodesk.com/en/docs/oauth/v2/tutorials/get-3-legged-token/
http://learnforge.autodesk.io/#/oauth/3legged/
Unfortunaly the code sample for that bit is in node and we are still working on a Java equilvalent
Some of our endpoints require 3-legged oauth to access personal data - see here for an example and you can always refer to the authentication context section of each endpoint for the oauth flow required.

Google API v2 -

Hi everybody,
well, here it is my problem.
I have a corporation gmail user, lets say developer-user#mycompany.com, and I would like to list all the gsheets I have in my gdriver trhough the google API for Java applications, so I generated the credentials I supposed to need:
the email, which was auto-created by google with a different domain,
in this case something like 1234567890#developer.gserviceaccount.com
then I created the p12 key file.
After that I tried the connection and everything ran fine, but It did not list the spread sheets I had, and I figured out that I can not list all the gsheets I had 'till I shared them with the 1234567890#developer.gserviceaccount.com mail/user, but the problem is that I can NOT share anything outside of the #mycompany.com domain, even though the email (1234567890#developer.gserviceaccount.com) created for the authentication is linked to my developer-user#mycompany.com account.
I am not sure if I was clear enough, but what I need is a solution for that. did someone figur out something? may you help me?
Anyway, thank you guys and I appreciate your time.

You'll have to ask your Google Apps Admin to enable sharing outside your domain on Google docs, that's the only way Drive will allow the service account to reach existing docs.
The only alternative is to recreate the docs using the service account (programatically) and share them with your account.

Your admin can delegate domain wide access to your app which will then be able to impersonate you.
Alternatively, don't use service accounts and simply generate a refresh token for your own account (which is by far the easiest solution).

How to post with Google Plus API - Java

I'm trying to create a web service to use the Google Plus API. I'm writing it in java, however I can't figure out what files I need and how I would go about posting to Google plus groups using Java
If you have any insite please could you post relavent links and helpful tips to help me out.
EDIT 1:
I have been playing around with the GooglePlus API provived by Google and have written a project based on the sample code given from this page: https://developers.google.com/+/domains/posts/creating
The code runs fine until it gets to the GoogleTokenResponse tokenResponse = flow.newTokenRequest(code).setRedirectUri(REDIRECT_URI).execute(); line. Where it returns a null error. I am copying the link provided in the console and pasting in the code, however everytime it just returned a null error, is there a specific part of the returned code given that causes an issue?

Posting to Google+ is only supported for accounts in a Google Apps Domain (and even then, with restrictions).
If you are logging in using a GMail account - you don't have an Apps Domain account. If you're logging in using some other email address (ie - you have an email address, but you can't use Google account features such as GMail or Google Drive with it) then you don't have an Apps Domain account. If you are using a Domain account, your Domain admin may need to enable Google+ for your Domain before this works.
See https://developers.google.com/+/domains/getting-started for the differences between what you can do with the Domains API and the regular Plus API.
Note that neither API lets you post to a Google+ Community or post publicly. The Domains API does let you post to a user's circle, as long as the members of that circle are also part of the Domain. The Domain API also lets you post to everyone in the Domain. The normal Plus API does not allow posting at all.
There is a third API, knows as the Pages API, which allows Pages to publicly post on their stream. This API, however, is available to a limited number of partners such as Hootsuite. You can read more at https://developers.google.com/+/api/pages-signup, but there isn't much more available publicly.

Your web service should first authenticate against Google. This authentication can either be using a service account (if you want to post only through one account) or users's account (if you want to post via user's account) using oAuth mechanism.
For more details about how to authenticate, refer to How to authenticate our users in our website with Google Account
Have a look at https://developers.google.com/+/api/ for detailed information about how Google Plus APIs can be used.

Get Twitter's data from URL with Java

I'm trying to get the Twitter data from the Twitter page URL.
I.e. I have this URL http://twitter.com/eBay.
How can I to get followers number, etc... from every URL?
I'd like to use the Twitter API, but I've not an app to register. So it's not possible for me to authenticate, because I'm creating an University Thesis project.
Cheers.

I highly recommend using Twitter4J. It's a useful library for Java to parse all of this information. You can find it here.
As for not having an app to register, Twitter is pretty loose about obtaining credentials, so just create credentials on your personal twitter account and you should be good to go. You don't need a specific app to do it.
It's also important to know Twitter has rate limits on their API calls. You can find that information here.
Hope this helps!

Post tweet from client's account using Java

As per this SO answer and other google search results, it seems that twitter has stopped supporting username and password based authentication to post updates. However to my surprise, when I downloaded this app, it amazed me as it simply allows me to send tweets using my username and password only, requiring no consumer key and consumer secrets. So how is that possible?
All the tutorial I went through after googling suggested that I need to register my app and use the access token for posting. This also requires entering some PIN if I use it in my app. What I want is that my app must allow the client to enter only username and password to post tweets. So how should I do that in java?
I would even welcome a solution which utilizes the above app only to post tweets.(e.g. using Runtime.getRuntime())
Also refer this unanswered SO question. This is similar to what I want to do. Only that I want to do it using desktop application.