public BlobEntity getById(@NotNull String uid) throws StorageException {
        Preconditions.requireNonBlank(uid, "uid must be non-blank");
        return super.get(uid, BlobEntity.class);
    }
Get a blob by its ID (nb: not name, its ID set when stored).
manager/api/jpa/src/main/java/io/apiman/manager/api/jpa/blobstore/BlobStoreRepository.java