guyinyou opened a new pull request, #1271:
URL: https://github.com/apache/rocketmq-clients/pull/1271

   ## Summary
   - `Commit()` and `RollBack()` in `transactionImpl` silently swallowed errors 
from `endTransaction`: errors were only logged inside the `Range` callback, and 
the caller always received `nil`, making it impossible to detect a failed 
commit or rollback.
   - Capture the error from the `Range` closure and return it to the caller; 
stop iteration on first error (matching Java's fail-fast behavior).
   - Return an error when `messageSendReceiptMap` is empty, aligning with the 
Java client's `IllegalStateException` ("Transactional message has not been sent 
yet").


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