Java Transaction API Question:

Demarcation specifies a limit for a bean managed transaction, i.e. once a transaction begins, it ends with either commit or abort the key points of who issues begin and who issues commit or abort is called demarcating transactional boundaries.

Declarative Demarcation
Declarative transaction demarcation is also known as Container-Managed Transaction. The container demarcates different transactions as per the requirements specified by the application assembler in deployment descriptor. These instructions are called as transaction attributes.

Programmatic Demarcation
Programmatic Demarcation can also be called as Bean-Managed Transaction, the bean code that demarcates using the javax.transaction.UserTransaction interface.

The resources are accessed between javax.transaction.UserTransaction.begin() and javax.transaction.UserTransaction.commit(). This access makes the part of the transaction. The resource and resource manager declared in the deployment descriptor.