Authorizing local App Engine app to access Cloud Storage

[Orbit via StackOverflow]

I'm developing and testing an App Engine application locally. I would like the application to print out a list of all Bucket names in the projects Google Cloud Storage.

Some code:

Storage storage = StorageOptions.getDefaultInstance().getService();
Page<Bucket> buckets = storage.list(Storage.BucketListOption.pageSize(100));
Iterator<Bucket> bucketIterator = buckets.iterateAll();
while (bucketIterator.hasNext()) {
    Bucket bucket = bucketIterator.next();
    System.out.println("bucket name: " + bucket.getName());
}

To access Cloud Storage, I am using the google-cloud library for Java found here: http://googlecloudplatform.github.io/google-cloud-java/0.9.4/index.html

Running the above snippet results in a 401 Unauthorized.

As specified under the "What is it?" section in the above link, if the application is running inside App Engine or Compute Engine, authentication is automatic.

Since I am running locally, I assume automatic authentication does not work (please correct me if i'm wrong).

To authenticate, I followed one of the options listed under the Authentication section and issued the command gcloud auth application-default login in the terminal.

I no longer get a 401 unauthorized when trying to access Cloud Storage, however do get the following:

java.security.AccessControlException: access denied ("java.io.FilePermission" "/Users/example/.config/gcloud/active_config" "read")
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
at java.security.AccessController.checkPermission(AccessController.java:884)

1. How can I resolve this AccessControlException?
2. Is this the correct way to authenticate to Cloud Storage while developing locally? If not, what is?

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