OAuth2 and Drive API cannot display / extract files

Question

OAuth2 and Drive API cannot display / extract files

I have a web application that should display all files from my Google Drive and then extract them when clicked. I use OAuth for authentication and it seems to work (the same code works well with the Calendar API). I tried different areas in serviceAccountScopes to no avail.

Mostly authentication:

credential = new GoogleCredential.Builder().
setTransport(HTTP_TRANSPORT).
setJsonFactory(JSON_FACTORY).
setServiceAccountId(apiEmail).
setServiceAccountScopes(DriveScopes.DRIVE).
setServiceAccountPrivateKeyFromP12File(p12File).build();

credential.refreshToken();

service = new Drive.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential).
setApplicationName("My API").build();

edit: I have to add that the accessToken account is null before calling refreshToken ().

After that I try:

FileList files = service.files().list().execute();

The returned FileList (must contain elements):

{"etag":"\"_U9FTLXcHskmKgrWAZqJlfW8kCo/vyGp6PvFo4RvsFtPoIWeCReyIC8\"","items":[],"kind":"drive#fileList","selfLink":"https://www.googleapis.com/drive/v2/files"}

If I check that selfLink contains the following:

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "dailyLimitExceededUnreg",
    "message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup.",
    "extendedHelp": "https://code.google.com/apis/console"
   }
  ],
  "code": 403,
  "message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup."
 }
}

. (, , : qaru.site/questions/1146297/...). , Drive and Drive SDK (qaru.site/questions/783365/...).

:

File file = service.files().get(fileId).execute();

(fileId ):

An error occured: com.google.api.client.googleapis.json.GoogleJsonResponseException: 404 Not Found
{
  "code" : 404,
  "errors" : [ {
    "domain" : "global",
    "message" : "File not found: 0B97KF40kTwrTaTllMnZCTV9ZSnM",
    "reason" : "notFound"
  } ],
  "message" : "File not found: 0B97KF40kTwrTaTllMnZCTV9ZSnM"
}