Hello,

I am new to all the force.com stuff, so please forgive me if I am using the wrong terminology or am unclear. I will try to be as clear as I can. 

My goal is to build a java application that periodically monitors a user chatter stream. I am not running this code via a web browser or application server - this is pure java on the command line. I have setup a test remote application and have a valid client key and client secret key.

My goal is to have the user enter a username/password for the initial authentication and then to use the access_token / refresh_token flow for subsequent runs. Thus, in the User-Agent flow code below, my callback URI doesn't really point to anything legitimate - I want to do this all in code if possible.

Trying to implement the User-Agent flow as described here (http://www.salesforce.com/us/developer/docs/chatterapi/index.htm , "Understanding the User-Agent OAuth Flow" article), my code looks like this:

----

// chatter.auth.url == https://login.salesforce.com/services/oauth2/authorize

String hostUrl = System.getProperty("chatter.auth.url"); 

String clientId = System.getProperty("chatter.oauth.consumerKey");
String clientSecret = System.getProperty("chatter.oauth.consumerSecret");

HttpPost post = new HttpPost(hostUrl);

HttpParams params = new BasicHttpParams();
params.setParameter("client_id", clientId);

params.setParameter("redirect_uri", "https%3A%2F%2Flocalhost%3A8080%2FConnectTest%2Foauth%2F_callback");
params.setParameter("response_type", "token");
post.setParams(params);

response = clientService.execute(post);

----

When I run the above code, I receive a response that says "error=unsupported_response_type&error_description=response%20type%20not%20supported"

I have tried another API reference which uses the password method of OAuth authentication (http://www.salesforce.com/us/developer/docs/chatterapi/index.htm , "Step Two: Connect to Chatter API Using OAuth"). Based on that article, my code looks like this:

----

// chatter.token.url == https://na14.salesforce.com/services/oauth2/token

String hostUrl = System.getProperty("chatter.token.url");  
String clientId = System.getProperty("chatter.oauth.consumerKey");
String clientSecret = System.getProperty("chatter.oauth.consumerSecret");

HttpPost post = new HttpPost(hostUrl);
post.setHeader("Content-Type", "application/x-www-form-urlencoded");

HttpParams params = new BasicHttpParams();
params.setParameter("grant_type", "password");
params.setParameter("client_id", clientId);
params.setParameter("client_secret", clientSecret);
params.setParameter("username", username);
params.setParameter("password", password);
post.setParams(params);

response = clientService.execute(post);

----

When I execute the above code, I get a JSON response that says "error:  grant_type_unsupported". The short of it is that I cannot get an authorization token or a session token or anything else returned from my attempts to connect via OAuth. 

What am I doing wrong here or missing?  I am very confused and can't get any code that I have found in the API documentation to work and provide the documented response. 

Any help at all would be greatly appreciated!