Inserting blog via Java API leads to "We're sorry, but you don't have permission to access this resource."

I am not able to insert a new post using the new v3 Java API. Any attempt 
lead to a 403 HTTP status code with the error message "We're sorry, but you 
don't have permission to access this resource."

Java Code:

InputStream credentialStream = 
RunClient.class.getResourceAsStream(CLIENT_SECRETS_JSON);
Collection<String> scopes = Collections.singleton(BloggerScopes.BLOGGER);

HttpTransport httpTransport = new NetHttpTransport();
JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();

GoogleCredential credential = GoogleCredential
   .fromStream(credentialStream, httpTransport, jsonFactory)
   .createScoped(scopes);

Blogger blogger = new Blogger.Builder(httpTransport, jsonFactory, 
credential)
    .setApplicationName("myApp")
    .build();

Posts posts = blogger.posts();

Author author = new Post.Author();
author.setId("...");

Post post = new Post();
post.setContent("<h1>Hallo Post</h1>");
post.setAuthor(author);
post.setTitle("API Test Post");
       
Posts.Insert insert = posts.insert(BLOG_ID, post);
insert.setIsDraft(true);

Post insertedPost = insert.execute();  // <-<-<-<- Here it fails!!!!!



Invoking this code leads to following Java Stracktrace:

Exception in thread "main" 
com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 
Forbidden
{
  "code" : 403,
  "errors" : [ {
    "domain" : "global",
    "message" : "We're sorry, but you don't have permission to access this 
resource.",
    "reason" : "forbidden"
  } ],
  "message" : "We're sorry, but you don't have permission to access this 
resource."
}
    at 
com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:145)
    at 
com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
    at 
com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
    at 
com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:321)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1056)
    at 
com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:419)
    at 
com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352)
    at 
com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:469)
    at ch.keller.blogger.RunClient.test1(RunClient.java:153)
    at ch.keller.blogger.RunClient.main(RunClient.java:80)


Please note: 

- I use the most recent Java Blogger API. Dependency from build.gradle 
configiration: 'com.google.apis:google-api-services-blogger:v3-rev49-1.21.0'

- CLIENT_SECRETS_JSON points to a JSON file containing all credentials 
created via the Google console https://console.developers.google.com 

- Inserting a new post via Google API explorer 
https://developers.google.com/apis-explorer/?hl=en_US#p/blogger/v3/blogger.pages.insert 
worked as expected. So, I conclude, that the Blogger settings are OK.

- Reading a post works fine. So I conclude, that the private_key in the CLIENT_SECRETS_JSON 
file is OK. Java Code:

    Get get = posts.get(BLOG_ID, POST_ID);
    Post post = get.execute();


Can someone please help me with this?

- Is the Java code as it must be? I didn't find a working example for the 
most recent API version I use...

- Do I need to change the Blogger settings (even if accessing the blog via 
Google API explorer worked nicely)?

- How to debug this?

- How to fix this?





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