@Override
	public LocalTransactionState checkLocalTransaction(MessageExt msg) {
		System.out.println("check: " + new String(msg.getBody()));
		return LocalTransactionState.COMMIT_MESSAGE;
	}
MQ check back local transaction states.
@param msg messages
@return Transaction state
spring-cloud-alibaba-examples/rocketmq-example/rocketmq-tx-example/src/main/java/com/alibaba/cloud/examples/tx/TransactionListenerImpl.java