code: public byte[] readBlobFromId(String bucketName, String blobName, long blobGeneration) {
      // [START readBlobFromId]
      BlobId blobId = BlobId.of(bucketName, blobName, blobGeneration);
      byte[] content = storage.readAllBytes(blobId);
      // [END readBlobFromId]
      return content;
    }
docs: [VARIABLE 42]