What are transaction attributes ?

The transaction attribute specifies how the Container must manage transactions for a method when a client invokes the method via the enterprise bean’s home or component interface or when the method is invoked as the result of the arrival of a JMS message.

Below is a list of transactional attributes : 

1. NotSupported

Transaction context is unspecified.

2. Required

Bean's method invocation is made within a transactional context.

If a client is not associated with a transaction, a new transaction is invoked automatically.

3. Supports

If a transactional context exists, a Container acts like the transaction attribute is Required, else - like NotSupported.

4. RequiresNew

A method is invoked in a new transaction context.

5. Mandatory

If a transactional context exists, a Container acts like the transaction attribute is Required,

else it throws a javax.ejb.TransactionRequiredException.

6. Never

A method executes only if no transaction context is specified.