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Hibernate / Hibernate interview questions

Explain transaction management in hibernate.

In hibernate framework, we have Transaction interface that defines the unit of work. It maintains abstraction from the transaction implementation (JTA,JDBC).

A transaction is associated with Session and instantiated by calling session.beginTransaction().

The transaction interfaces defines the below methods.

  • void begin() starts a new transaction.
  • void commit() ends the unit of work unless we are in FlushMode.NEVER.
  • void rollback() forces this transaction to rollback.
  • void setTimeout(int seconds) it sets a transaction timeout for any transaction started by a subsequent call to begin on this instance.
  • boolean isAlive() checks if the transaction is still alive.
  • void registerSynchronization(Synchronization s) registers a user synchronization callback for this transaction.
  • boolean wasCommited() checks if the transaction is commited successfully.
  • boolean wasRolledBack() checks if the transaction is rolledback successfully.

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