Welcome back, Sujit Kumar Mishra

What are the different Transaction Propagation Levels in Spring? 

Transaction Propagation Levels in Spring (Simple Explanation):

1: REQUIRED – Join the current transaction if one exists; otherwise, start a new one.

(Most common, default option.)

2: REQUIRES_NEW – Always start a new transaction, suspending any existing one.

3: SUPPORTS – Join the current transaction if one exists; if not, run without a transaction.

4: NOT_SUPPORTED – Run without a transaction, suspending any existing one.

5: MANDATORY – Must run inside an existing transaction; throws an error if none exists.

6: NEVER – Must run without a transaction; throws an error if a transaction exists.

7: NESTED – Runs within a nested transaction if a current transaction exists; otherwise, acts like REQUIRED.

Easy way to remember:

- REQUIRED and SUPPORTS join existing transactions.

- REQUIRES_NEW and NESTED always create a new or nested transaction.

- MANDATORY and NEVER enforce presence or absence of a transaction.

- NOT_SUPPORTED ignores transactions completely.

Example:

import org.springframework.transaction.annotation.Transactional;
import org.springframework.stereotype.Service;

@Service
public class MyService {
  @Transactional(propagation = Propagation.REQUIRED) 
                   // Change propagation type as needed
  public void doSomething() {
    // Business logic here
  }
}