Can you list and explain different propagation strategies in Spring transactions?

In Spring, there are several propagation strategies for managing transactions:

• REQUIRED (default): if a transaction exists, the method runs within it; otherwise, a new one is created.
• REQUIRES_NEW: always creates a new transaction, suspending the existing one.
• SUPPORTS: if a transaction exists, the method runs within it; otherwise, it runs without a transaction.
• NOT_SUPPORTED: the method runs outside of a transaction, suspending any existing one.
• MANDATORY: the method must run within an existing transaction; otherwise, an exception is thrown.
• NEVER: the method must not run within a transaction; otherwise, an exception is thrown.
• NESTED: if a transaction exists, a nested transaction (savepoint) is created; otherwise, it behaves like REQUIRED.

Example usage:

@Transactional(propagation = Propagation.REQUIRES_NEW)
public void saveData() {
    // code executed within a new transaction
}