JEE Transaction

2 types of transactions:
a. Container-managed transactions
b. Bean-managed transactions

Table 14-1 Transaction Attributes and Scope 

Transaction Attribute	Client's Transaction	Business Method's Transaction
Required	None	T2
	T1	T1
RequiresNew	None	T2
	T1	T2
Mandatory	None	error
	T1	T1
NotSupported	None	None
	T1	None
Supports	None	None
	T1	T1
Never	None	None
	T1	Error

Mandatory vs Never
NotSupported vs Supports

@TransactionAttribute(NOT_SUPPORTED)
@Stateful
public class TransactionBean implements Transaction {
...
    @TransactionAttribute(REQUIRES_NEW)
    public void firstMethod() {...}
 
    @TransactionAttribute(REQUIRED)
    public void secondMethod() {...}
 
    public void thirdMethod() {...}
 
    public void fourthMethod() {...}
}