JavaMaildir error: No provider for maildir

Question

I'm trying to develop an e-mail client for android using JavaMail and JavaMaildir. I've downloaded JavaMaildir from here: http://sourceforge.net/projects/javamaildir/, version 0.5.

I've added the .jar file into the libs folder of my android project. The project compiles without problem.

Here is the code I'm using to initialize the store object:

Properties prop = new Properties();
prop.put("mail.store.maildir.autocreatedir", true);
this.session = Session.getInstance(prop);
// Creates the directory if it doesn't exists
File dir = this.getDir(POP3ClientService.md_name, Context.MODE_PRIVATE);
String url = "maildir:" + dir.getAbsolutePath();
Log.d("DEBUG", url);
try {
    this.store = this.session.getStore(new URLName(url));
} catch (NoSuchProviderException e) {
    // TODO Auto-generated catch block
    this.store = null;
    Log.e("ERROR", e.getMessage());
}

http://javamaildir.sourceforge.net/examples/ Which is taken from the example available on the project site: http://javamaildir.sourceforge.net/examples/

Unfortunately, it throws a NoSuchProviderException and therefore I cannot use the store since it's a null pointer.

The error message says No provider for maildir. Where am I wrong?