(Java) Refresh Schwab OAuth2 Access Token

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // See Get Schwab OAuth2 Access Token 
    // for sample code showing how to obtain a Schwab access token for desktop apps.

    // This example assumes we previously obtained an OAuth2 access token for Schwab.

    CkJsonObject jsonToken = new CkJsonObject();
    success = jsonToken.LoadFile("qa_data/tokens/schwab-access-token.json");
    if (success != true) {
        System.out.println("Failed to load schwab-access-token.json");
        return;
        }

    // The access token JSON looks something like this:

    // {
    //   "expires_in": 3600,
    //   "x_refresh_token_expires_in": 8726400,
    //   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
    //   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
    //   "token_type": "bearer"
    // }

    CkOAuth2 oauth2 = new CkOAuth2();

    oauth2.put_TokenEndpoint("https://api.schwabapi.com/v1/oauth/token");

    // Replace these with actual values.
    oauth2.put_ClientId("APP_KEY");
    oauth2.put_ClientSecret("APP_SECRET");
    oauth2.put_UseBasicAuth(true);

    // Get the "refresh_token"
    oauth2.put_RefreshToken(jsonToken.stringOf("refresh_token"));

    // Send the HTTP POST to refresh the access token..
    success = oauth2.RefreshAccessToken();
    if (success == false) {
        System.out.println(oauth2.lastErrorText());
        return;
        }

    // The response contains a new access token, but we must keep
    // our existing refresh token for when we need to refresh again in the future.
    jsonToken.UpdateString("access_token",oauth2.accessToken());

    // Save the new JSON access token response to a file.
    // The access + refresh tokens contained in this JSON will be needed for the next refresh.
    CkStringBuilder sbJson = new CkStringBuilder();
    jsonToken.put_EmitCompact(false);

    jsonToken.EmitSb(sbJson);
    sbJson.WriteFile("qa_data/tokens/schwab-access-token.json","utf-8",false);

    System.out.println("OAuth2 token refreshed!");
    System.out.println("New Access Token = " + oauth2.accessToken());
  }
}