Meaning of propagation values in spring declarative transaction configuration

Value	Meaning
REQUIRED	Supports the current transaction, and creates a new transaction if there is no current transaction.
SUPPORTS	Supports the current transaction and is executed in a non-transactional manner if no transaction is currently in use.
MANDATORY	Supports the current transaction and throws an exception if there is no current transaction.
Requires_new	Creates a new transaction, suspending the current transaction if the transaction currently exists.
not_supported	Executes the operation in a non-transactional manner, suspending the current transaction if a transaction is currently present.
Never	Executes in a non-transactional manner, throwing an exception if a transaction is currently present.
NESTED	Supports the current transaction, executes a nested transaction if the current transaction exists, and creates a new transaction if there is no current transaction.

Meaning of propagation values in spring declarative transaction configuration