lhotari commented on issue #25591:
URL: https://github.com/apache/pulsar/issues/25591#issuecomment-4335328847

   > pulsar-2.7.4
   
   @Fernando-Zh Pulsar 2.7.4 is an unsupported version. Please upgrade your 
client to 4.0.10, it can connect to older Pulsar broker versions. 
   
   Unsupported Pulsar versions contain a lot of known security issues and CVEs. 
Security advisories: https://pulsar.apache.org/security/#security-advisories . 
It's not recommended to run unsupported Pulsar versions in production.
   
   I'll close this issue since this won't be fixed.
   
   Your problem might also be related to mixed Pulsar versions on the 
classpath. For newer Pulsar versions such as 4.0.x, there's Pulsar BOM to avoid 
versions getting mixed, 
https://pulsar.apache.org/docs/client-libraries/java-setup/#pulsar-bom . 
pulsar-client-api and pulsar-client versions should be aligned when using the 
default shaded Pulsar client.


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