Upgrade to Spring Data Redis 3 and Jedis 4.3.2 throws JedisCluerOperationException

[Raul Muresan]

Hello,
I stumbled upon your group in the jedis git repository, I am facing a blocker and don’t know how to get over it.
Here is a link to the stackoverflow question that I created: https://stackoverflow.com/questions/76207822/updating-to-spring-boot-3-0-6-jedis-fails-unit-tests-with-jedisclusteroperatio

In short lines, the issue is that since I updated my java app to spring boot 3 (spring-data-redis included) and jedis 4.3.2 all unit tests that use jedis fail with:
redis.clients.jedis.exceptions.JedisClusterOperationException: Could not initialize cluster slots cache.
Debugging JedisConnectionException resulted to: "Failed to connect to any host resolved for DNS name."

I really hope that you can give me a couple of hints on where to investigate further or maybe something that I am missing.

[Sazzadul Hoque]

GitHub link of same content: https://github.com/redis/jedis/issues/3392 

Copying my (first) reply:

I wonder what is in your unit tests. Could it be just limited to creating a cluster connection object? Without executing any other command?

Why I'm wondering this is because of a certain difference between Jedis 3.x and Jedis 4+ which seems to matter in your case.
In Jedis 3.x, when a JedisCluster object was being created with all cluster nodes down/unavailable, the constructor would not throw any exception and the object would be created BUT it would be a stale object with which no server operations can be done.
To address requests from users, Jedis 4.0 started throwing exceptions in such cases with message `Could not initialize cluster slots cache.`.

I hope I have been able to identify your problem properly and you have found it helpful. Thanks.

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