JarCasting 
MCMSAL
MinecraftMicrosoft Authentication Library for Java 8+, adapted from MiniLauncher code (Java 11)
Installation
Gradle
In your block repositories, add this lines :
repositories {
mavenCentral()
}
and in your dependencies block :
dependencies {
implementation 'fr.flowarg:mcmsal:VERSION'
}
Maven
<dependencies>
<dependency>
<groupId>fr.flowarg</groupId>
<artifactId>mcmsal</artifactId>
<version>VERSION</version>
</dependency>
</dependencies>
Usage
Using JavaFX
There is a class named JFXAuth who can help you to use auth with Microsoft account (using a webview). There is an example :
// in a class
private GridPane layout;
// in a method
JFXAuth.authenticateWithWebView(new JFXAuthCallback() {
@Override
public void beforeAuth(WebView webView)
{
MyClass.this.layout.getChildren().add(webView);
}
@Override
public void webViewCanBeClosed(WebView webView)
{
MyClass.this.layout.getChildren().remove(webView);
}
@Override
public Consumer<AuthInfo> onAuthFinished()
{
return (authInfo) -> {
System.out.println(authInfo);
// another actions
};
}
@Override
public void exceptionCaught(MCMSALException e)
{
e.printStackTrace();
}
@Override
public double prefWidth()
{
return 405;
}
@Override
public double prefHeight()
{
return 405;
}
})
Using Swing
There is no class who can help you to auth directly with swing. If you've found a solution, please make a pull request. If you have the authCode, you can use directly MicrosoftAuthentication#authenticate(String, Consumer<AuthInfo>) method.