How to wrap rsync with interactive login using Java?

I am trying to wrap rsync with java and I am having difficulty with interactive login. I can get the unix command-line utility expectto work, but I cannot figure out what the equivalent of java is ExpectJ. Here is my current code:

import java.io.IOException;

import expectj.ExpectJ;
import expectj.Spawn;


public class ExpectjTest {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        String mypassword= "example";
        String cmd = "rsync  -e ssh --list-only --recursive   user@host:~/\n";
        ExpectJ expectinator = new ExpectJ();
        Spawn rsync = expectinator.spawn("/bin/bash");
        try {

            rsync.send(cmd);
            rsync.expect("password:",2);
            rsync.send(mypassword+"\n");
            rsync.expectClose();


        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }   
    }
}

When I run this, I get an error message:

ssh_askpass: exec(/usr/libexec/ssh-askpass): No such file or directory
Permission denied (gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive).

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