Authorization problem when updating a page in Blogger with Java

Hi.

I'm getting a GoogleJsonResponseException 401 Unauthorized Error when I try 
to update a page in Blogger using a desktop application coded in Java.
The code is this:

        HttpTransport httpTransport = 
GoogleNetHttpTransport.newTrustedTransport();
        JacksonFactory jsonFactory = JacksonFactory.getDefaultInstance();
        
        List<String> serviceAccountScopes = new ArrayList<String>();
        serviceAccountScopes.add("https://www.googleapis.com/auth/blogger");
        serviceAccountScopes.add(BloggerScopes.BLOGGER);
        
        Credential credential = new GoogleCredential.Builder()
            .setTransport(httpTransport)
            .setJsonFactory(jsonFactory)
            .setServiceAccountId("*******@developer.gserviceaccount.com")
            .setServiceAccountUser("[email protected]")
            .setServiceAccountPrivateKeyFromP12File(new File("key.p12"))
            .setServiceAccountScopes(serviceAccountScopes)
            .build();

        blogger = new Blogger.Builder(httpTransport, jsonFactory, null)
                      
.setApplicationName("*********.apps.googleusercontent.com")
            .build();

        myEntry = new Page();
        myEntry.setTitle("Estrenos");
        myEntry.setContent(pagina);
        
        String pageID = "6734608486126438390";
                
        blogger.pages().update(blogID, pageID, myEntry).execute();

What am I doing wrong?

Thank you.

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