majialoong opened a new issue, #9809: URL: https://github.com/apache/rocketmq/issues/9809
### Before Creating the Enhancement Request - [x] I have confirmed that this should be classified as an enhancement rather than a bug/feature. ### Summary When the getAcl method receives a null subject (for example, due to incorrect user input or a non-existent subjectType), it currently returns a raw NPE error message. This is not user-friendly. We should avoid NPE and provide a clear, helpful error message instead. <img width="1818" height="222" alt="Image" src="https://github.com/user-attachments/assets/8661acb0-911f-4c37-83e7-03b62c88f99c"; /> ### Motivation Avoid returning raw NPE error messages directly. ### Describe the Solution You'd Like Check whether the subject is null and handle the exception accordingly.This is also similar to other methods in `AuthorizationMetadataManagerImpl`, such as `createAcl` and `updateAcl`. The improved message prompt is as follows: <img width="833" height="178" alt="Image" src="https://github.com/user-attachments/assets/f557e26b-e08e-4748-835a-01fe66772967"; /> ### Describe Alternatives You've Considered No ### Additional Context _No response_ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
