Transaction Attribute - II
RequiredNew : Container always starts a new transaction, enlists the resources and commits the transaction as soon as the method call completes. If the client's request is associated with a transaction context, this will be suspended until the container commits the transaction.
Mandatory : method is invoked within a transaction context with that the client request is associated. If the client's request is not associated with any transaction, then the container throws an exception.
Never : method is invoked if the client's request is not associated with any transaction. The container throws an exception if the client's request is associated with one.