Sample Java code using Jersey and JSONObject for connecting to the new RESTful SugarCRM REST API in 6.7 and later.

gistfile1.java

package com.sugarcrm.client;
 
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import net.sf.json.JSONObject;
 
public class JerseyClientPost {
 
    public static void main(String[] args) {
 
        try {
     
            Client client = Client.create();
     
            // specify the REST web service to interact with
            String baseurl = "<<instanceurl>>/rest/v10";
     
            WebResource webResource = client.resource(baseurl + "/oauth2/token");
     
            JSONObject jsonInput = new JSONObject()  
                .element( "grant_type", "password" )  
                .element( "username", "<<username>>" )  
                .element( "password", "<<password>>" )  
                .element( "client_id", "sugar" );  
                
            ClientResponse response = webResource.type("application/json")
                .post(ClientResponse.class, jsonInput.toString());
         
            if (response.getStatus() != 201) {
                throw new RuntimeException("Failed : HTTP error code : " + response.getStatus());
            }
            
            JSONObject jsonOutput = (JSONObject) JSONSerializer.toJSON( response.getEntity(String.class) ); 
            
            if ( jsonOutput.has("error") ) {
                throw new RuntimeException("Failed : " + jsonOutput.getString("error_message"));
            }
            
            String token = jsonOutput.getString("access_token");
            
            System.out.println("Success! OAuth token is " +  token);
     
        } catch (Exception e) {
            
            e.printStackTrace();
            
        }
        
    }
    
}

Not sure why you expect code 201 from Sugar on oauth2/token. It returns 200 AFAIK.

@mmarum-sugarcrm please do run an give me any feedback on changes. Don't have a Java env so I have nowhere to run it.