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There are a few possible reasons why this error might occur:

1. Configuration issue: If the configuration of the Cassandra cluster is incorrect, then the service may be unable to connect to the Cassandra database, resulting in an AllNodesFailedException. Check that the configuration settings for the Cassandra cluster are accurate and up-to-date.

2. Connection problem: There may be a connection problem between the service and the Cassandra database. Verify that the service has access to the Cassandra database and that the Cassandra database is running.

3. Version compatibility issue: If you are using an incompatible version of Cassandra with your service, it may lead to an AllNodesFailedException. Double-check that the version of Cassandra you are using is compatible with your service.

4. Resource constraints: Your system may not have enough resources to support the Cassandra database, which could cause an AllNodesFailedException. Check that your system has enough memory, CPU, and disk space to run Cassandra.

5. Security settings: If the Cassandra cluster is running in a secure environment, then the service may be unable to connect to the Cassandra database due to security restrictions. Verify that the security settings for the Cassandra cluster are appropriately configured.

In the case of an AllNodesFailedException during Spring startup, it is essential to review the logs for additional information on where the problem occurred. The logs can give insight into which nodes the service failed to connect to and why. Once identified, the root cause of the issue can be addressed to fix the problem.