Java Transaction API Question:

Explain the transactional attribute Required?

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Answer:

Required: This is the default transaction attribute that ensures the methods are invoked within Java Transaction API transaction context. Required makes the transactional context used by the bean. If not the new context will be created.

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Can you please explain demarcation and types of demarcation, declarative and programmatic demarcation?Explain the transactional attribute RequiredNew?