Azure AD Login Without user browser redirect?

I managed to get Azure AD Authentication to work by using the sample apps from ADAL4J library from GitHub.

Here it is working.

My question is: Can the same result be accomplished without the redirect to the Microsoft page? The customer wants to use his own internal login page.

I'm thinking some sort of behind the scenes POST request to the same URL, and getting the reply. This means my app will see the user credentials, I am ok with that.

Is this supported by Azure AD?

Environment: Java server side (Spring), AngularJS UI.

Thanks.