I just began to use this and I already stumbled on some from-my-side-strange errors.

I am using RestFB jar.

My problem is, that I can not get my session key (this is the start of everything :)).

FacebookClient facebookClient = new DefaultFacebookClient(API_KEY, SECRET_KEY);

try {
    String token = facebookClient.execute("auth.createToken", String.class, Parameter.with("null", "null"));
    System.out.println(token);

    String session = facebookClient.execute("auth.getSession", String.class, Parameter.with("auth_token", token));
    System.out.println(session);
} catch (FacebookException e) {
    e.printStackTrace();
}

I get the token correctly. Parameter.with("null,"null") is there because it demands at least one, but method for creating token doesn't expect any.

When trying to get the session key, I get the following error:

com.restfb.FacebookResponseStatusException: Received Facebook error response (code 100): Invalid parameter
at com.restfb.DefaultFacebookClient.throwFacebookResponseStatusExceptionIfNecessary(DefaultFacebookClient.java:357)
at com.restfb.DefaultFacebookClient.makeRequest(DefaultFacebookClient.java:320)
at com.restfb.DefaultFacebookClient.execute(DefaultFacebookClient.java:188)
at com.restfb.DefaultFacebookClient.execute(DefaultFacebookClient.java:178)

Documentation for getting session doesn't say any more parameters are required!

Did anybody already try this JAR or do you have any other solution for Java?

EDIT: Does the application needs to be "published" in searchers to be able to do this??