alibaba/spring-ai-alibaba · error · RuntimeException

Failed to retrieve item from Redis-like storage

Error message

Failed to retrieve item from Redis-like storage

What it means

RedisStore.getItem reads the JSON value for a namespace-qualified key and deserializes it back into a StoreItem. Failures reading from storage or deserializing the payload are wrapped in this RuntimeException, and the read lock is always released in a finally block.

Source

Thrown at spring-ai-alibaba-graph-core/src/main/java/com/alibaba/cloud/ai/graph/store/stores/RedisStore.java:111

	@Override
	public Optional<StoreItem> getItem(List<String> namespace, String key) {
		validateGetItem(namespace, key);

		lock.readLock().lock();
		try {
			String redisKey = createRedisKey(namespace, key);
			String value = redisLikeStorage.get(redisKey);

			if (value == null) {
				return Optional.empty();
			}

			StoreItem item = objectMapper.readValue(value, StoreItem.class);
			return Optional.of(item);
		}
		catch (Exception e) {
			throw new RuntimeException("Failed to retrieve item from Redis-like storage", e);
		}
		finally {
			lock.readLock().unlock();
		}
	}

	@Override
	public boolean deleteItem(List<String> namespace, String key) {
		validateDeleteItem(namespace, key);

		lock.writeLock().lock();
		try {
			String redisKey = createRedisKey(namespace, key);
			return redisLikeStorage.remove(redisKey) != null;
		}
		finally {
			lock.writeLock().unlock();
		}

View on GitHub (pinned to f82da0b50f)

Solutions

1. Inspect e.getCause(): if it is a JsonProcessingException/JsonParseException the stored payload no longer matches StoreItem — migrate or delete the stale key.
2. Verify Redis connectivity and credentials if the cause is a connection exception.
3. Re-write the item with putItem from the current library version to refresh the payload format.
4. Ensure the same ObjectMapper configuration is used for read and write.

Example fix

// before
StoreItem item = store.getItem(namespace, key).orElse(null); // may throw on legacy JSON
// after
StoreItem item;
try {
    item = store.getItem(namespace, key).orElse(null);
} catch (RuntimeException e) {
    logger.warn("getItem failed, treating as missing", e.getCause());
    item = null;
}

// no pre-call validation possible for stored payload; optionally check existence first
Optional<String> value = rawGet(key); // if the client exposes it, validate JSON before deserializing

try {
    return store.getItem(ns, key);
} catch (RuntimeException e) {
    if (e.getCause() instanceof JsonProcessingException) {
        logger.warn("Corrupt/legacy payload for {}:{} — treating as absent", ns, key);
        return Optional.empty();
    }
    throw e;
}

When it happens

Trigger: Calling RedisStore.getItem(...) when the storage read fails (connection issue) or the stored bytes cannot be deserialized into StoreItem (corrupted or schema-mismatched JSON, e.g. written by an older version of the class).

Common situations: Redis unavailable, stored payload changed shape after a StoreItem field/type change or library upgrade, manually edited Redis data, or ObjectMapper deserialization config mismatch.

Understand the failure class

Background: "failed to unmarshal" / json.Unmarshal errors: why parsing a response into a Go struct fails and how to fix it — this error's family across 23 libraries.

Related errors

• Failed to deserialize checkpoints
• Failed to store item in Redis-like storage
• OSS_UPLOAD_ERROR
• OSS_DOWNLOAD_ERROR
• OSS_GEN_URL_ERROR

AI-assisted analysis of alibaba/spring-ai-alibaba@f82da0b50f (2026-09-09). Data as JSON: /api/errors/742e24470d2ff1b8. Report an issue: GitHub.