Java/Scala SAML client example needed

I'm writing some Scala code that will run on a server. It needs to periodically connect to Office 365 to pull some data using OData. Office 365 uses SAML for web browser connections, so I'm planning on using that approach in my server code. Are there any suitable Java or Scala libraries I can use for the authentication step? At the very least, I'd love to see some sample code (perhaps using OpenSAML) to authenticate as a client using a username and password.