Example token request with a client credentials grant

ClientGrantRequest.java

import com.nimbusds.oauth2.sdk
import com.nimbusds.oauth2.sdk.auth
import com.nimbusds.oauth2.sdk.http
import com.nimbusds.oauth2.sdk.id
import com.nimbusds.oauth2.sdk.token

// Construct the client credentials grant
AuthorizationGrant clientGrant = new ClientCredentialsGrant();

// The credentials to authenticate the client at the token endpoint
ClientID clientID = new ClientID("super-client");
Secret clientSecret = new Secret("super-secret");
ClientAuthentication clientAuth = new ClientSecretBasic(clientID, clientSecret);

// The request scope for the token (may be optional)
Scope scope = new Scope("read", "write");

// The token endpoint
URI tokenEndpoint = new URI("https://auth.ondeck.tools/token");

// Make the token request
TokenRequest request = new TokenRequest(tokenEndpoint, clientAuth, clientGrant, scope);

TokenResponse response = TokenResponse.parse(request.toHTTPRequest().send());

if (! response.indicatesSuccess()) {
    // We got an error response...
    TokenErrorResponse errorResponse = (TokenErrorResponse) response;
}

AccessTokenResponse successResponse = (AccessTokenResponse) response;

// Get the access token
AccessToken accessToken = successResponse.getAccessToken();