How can I obtain the present transaction using Spring PlatformTransactionManager?

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You can obtain the present transaction using Spring PlatformTransactionManager by calling the static method TransactionAspectSupport.currentTransactionStatus() which will return the present transaction status.

The following is an example code:

@Service
public class TransactionService {

    @Autowired
    private PlatformTransactionManager transactionManager;

    public void method1() {
        // get the present transaction status
        TransactionStatus status = TransactionAspectSupport.currentTransactionStatus();

        // use the transaction status  
        boolean isNewTransaction = status.isNewTransaction();
        // ...
    }

    @Transactional
    public void method2() {
        // get the present transaction status
        TransactionStatus status = TransactionAspectSupport.currentTransactionStatus();

        // use the transaction status 
        boolean isNewTransaction = status.isNewTransaction();
        // ...
    }
}

In this example, we obtain the present transaction status for method1() and method2() by calling TransactionAspectSupport.currentTransactionStatus() within the method. Then we can use the transaction status to check whether it is a new transaction or commit/roll back the transaction, etc.