Invalid access token

It sounds like you're referring to using the OAuth app authorization flow. That's the process you would implement in your app for the normal case where you have each end-user connect their own Dropbox account to receive their own access token. You can find more information in the OAuth Guide and authorization documentation (as well as the documentation for the SDK/library you're using, if any). 

In your case, since you're using the non-recommended method of hard-coding your own access token in the app you distribute to users, you don't need to use the OAuth app authorization flow at all. 

For reference, the access token you get for your own account by using the "Generate" button on your app's page on the App Console is functionally the same as an access token you would retrieve for your account via the OAuth app authorization flow.

This is sample code which iam using to make my user a client through access token.. am i making some mistake which can cause to my access token invalid?

public class Main { private static final String ACCESS_TOKEN = "<ACCESS TOKEN>"; public static void main(String args[]) throws DbxException { // Create Dropbox client DbxRequestConfig config = DbxRequestConfig.newBuilder("dropbox/java-tutorial").build(); DbxClientV2 client = new DbxClientV2(config, ACCESS_TOKEN); }

FullAccount account = client.users().getCurrentAccount();

ListFolderResult result = client.files().listFolder(""); while (true) { for (Metadata metadata : result.getEntries()) { System.out.println(metadata.getPathLower()); } if (!result.getHasMore()) { break; } result = client.files().listFolderContinue(result.getCursor()); }