Lotus Notes Agent: java.io.IOException: Access is denied - javaagents

Question

I have a java agent that will list all the files from Google Drive using the api provided from google developer (https://developers.google.com/drive/api/v3/quickstart/java).
However, the agent is having a "Access is denied" error when trying to create the "tokens" folder from "C:\Program Files (x86)\IBM\Notes\framework" directory.
I have created the "tokens" folder manually but the error still occured.
I have put all the required jar files in "/jvm/lib/ext" and updated the java policy on my local as follows:
// custom java security policy, to allow external jar file access
grant { permission java.util.PropertyPermission "http.keepAlive", "read, write"; };
grant { permission java.security.AllPermission; }
My actual agent code
private static final String APPLICATION_NAME = "Google Drive API Java Quickstart";
private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
private static final String TOKENS_DIRECTORY_PATH = "tokens";
/**
* Global instance of the scopes required by this quickstart.
* If modifying these scopes, delete your previously saved tokens/ folder.
*/
private static final List<String> SCOPES = Collections.singletonList(DriveScopes.DRIVE_METADATA_READONLY);
private static final String CREDENTIALS_FILE_PATH = "/credentials.json";
public void NotesMain() {
try {
Session session = getSession();
AgentContext agentContext = session.getAgentContext();
this.main();
// (Your code goes here)
} catch(Exception e) {
e.printStackTrace();
}
}
/**
* Creates an authorized Credential object.
* #param HTTP_TRANSPORT The network HTTP Transport.
* #return An authorized Credential object.
* #throws IOException If the credentials.json file cannot be found.
*/
private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
// Load client secrets.
InputStream in = JavaAgent.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
if (in == null) {
throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
}
GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
// Build flow and trigger user authorization request.
GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
.setDataStoreFactory(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH)))
.setAccessType("offline")
.build();
LocalServerReceiver receiver = new LocalServerReceiver.Builder().setPort(8888).build();
return new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");
}
public static void main() throws IOException, GeneralSecurityException {
// Build a new authorized API client service.
final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
Drive service = new Drive.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
.setApplicationName(APPLICATION_NAME)
.build();
// Print the names and IDs for up to 10 files.
FileList result = service.files().list()
.setPageSize(10)
.setFields("nextPageToken, files(id, name)")
.execute();
List<File> files = result.getFiles();
if (files == null || files.isEmpty()) {
System.out.println("No files found.");
} else {
System.out.println("Files:");
for (File file : files) {
System.out.printf("%s (%s)\n", file.getName(), file.getId());
}
}
}
}
This is the error Ive'd got from the java debug console.
java.io.IOException: Access is denied.
at java.io.File.createNewFile(File.java:894)
at com.google.api.client.util.store.FileDataStoreFactory$FileDataStore.(FileDataStoreFactory.java:96)
at com.google.api.client.util.store.FileDataStoreFactory.createDataStore(FileDataStoreFactory.java:73)
at com.google.api.client.util.store.AbstractDataStoreFactory.getDataStore(AbstractDataStoreFactory.java:55)
at com.google.api.client.auth.oauth2.StoredCredential.getDefaultDataStore(StoredCredential.java:171)
at com.google.api.client.auth.oauth2.AuthorizationCodeFlow$Builder.setDataStoreFactory(AuthorizationCodeFlow.java:744)
at com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow$Builder.setDataStoreFactory(GoogleAuthorizationCodeFlow.java:209)
at JavaAgent.getCredentials(Unknown Source)
at JavaAgent.main(Unknown Source)
at JavaAgent.NotesMain(Unknown Source)
at lotus.domino.AgentBase.runNotes(Unknown Source)
at lotus.domino.NotesThread.run(Unknown Source)