OAuth2 one token for differet interfaces

Thanks Greg,

"or you can create and use multiple different access tokens" - that would be great!

I use the Java API SDK. Can you tell my how I can get an existing token or generate an additional token? Whenever I creat a "new" token the older token does not working anymore and an "invalid access token" exception is thrown. 

This is my code to generate a new token:

public static String doAuth() {

        // Only display important log messages.
        Logger.getLogger("").setLevel(Level.WARNING);

        // Read app info file (contains app key and app secret)
        DbxAppInfo appInfo;
        appInfo = new DbxAppInfo(APP_KEY, APP_SECRET);

        // Run through Dropbox API authorization process
        DbxRequestConfig requestConfig = new DbxRequestConfig("foo");
        DbxWebAuth webAuth = new DbxWebAuth(requestConfig, appInfo);
        
        
        DbxWebAuth.Request webAuthRequest = DbxWebAuth.newRequestBuilder()
                .withNoRedirect()
                .withForceReapprove(Boolean.FALSE)
                .build();

        String authorizeUrl = webAuth.authorize(webAuthRequest);
        System.out.println("1. Go to " + authorizeUrl);
        System.out.println("2. Click \"Allow\" (you might have to log in first).");
        System.out.println("3. Copy the authorization code.");
        System.out.print("Enter the authorization code here: ");

        String code = null;
        try {
            code = new BufferedReader(new InputStreamReader(System.in)).readLine();
        } catch (IOException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
        if (code == null) {
            System.exit(1);
            return null;
        }
        code = code.trim();

        DbxAuthFinish authFinish;
        try {
            authFinish = webAuth.finishFromCode(code);
        } catch (DbxException ex) {
            System.err.println("Error in DbxWebAuth.authorize: " + ex.getMessage());
            System.exit(1);
            return null;
        }

        System.out.println("Authorization complete.");
        System.out.println("- User ID: " + authFinish.getUserId());
        System.out.println("- Access Token: " + authFinish.getAccessToken());

        // Save auth information to output file.
        DbxAuthInfo authInfo = new DbxAuthInfo(authFinish.getAccessToken(), appInfo.getHost());
        File output = new File("token");
        try {
            DbxAuthInfo.Writer.writeToFile(authInfo, output);
            System.out.println("Saved authorization information to \"" + output.getCanonicalPath() + "\".");
        } catch (IOException ex) {
            System.err.println("Error saving to <auth-file-out>: " + ex.getMessage());
            System.err.println("Dumping to stderr instead:");
            try {
                DbxAuthInfo.Writer.writeToStream(authInfo, System.err);
            } catch (IOException ex1) {
                Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex1);
            }
        }

        return authFinish.getAccessToken();
    }