code: public List<Acl> listBlobAcls(String bucketName, String blobName, long blobGeneration) {
      // [START listBlobAcls]
      BlobId blobId = BlobId.of(bucketName, blobName, blobGeneration);
      List<Acl> acls = storage.listAcls(blobId);
      for (Acl acl : acls) {
        // do something with ACL entry
      }
      // [END listBlobAcls]
      return acls;
    }
docs: [VARIABLE 42]