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15

javax.persistence.EntityManager

: the PessimisticLockException will be thrown if the database locking failure causes transaction-level rollback the LockTimeoutException will be thrown if the database locking failure causes only statement-level rollback ... will be thrown if the database locking failure causes transaction-level rollback
14

JPA Lifecycle Events

throws an exception within an active transaction, the transaction is marked for rollback
14

Locking in JPA

either commit or rollback). ObjectDB supports also releasing a lock explicitly while the transaction
14

Detached Entity Objects

invocation of rollback or by a commit failure. Explicit Merge Detached objects can be attached
14

ObjectDB Object Database Features

, rollback. Processes and Threads All API classes and interfaces are thread safe. Support of efficient
14

JPA Exceptions

failures that require transaction rollback are represented by: The RollbackException exception usually
2

Step 4: Add a Servlet Class

()) em.getTransaction().rollback(); em.close(); } } @Override
1

javax.jdo.JDOEntityManager

locking failure causes transaction-level rollback the LockTimeoutException will be thrown if the database locking failure causes only statement-level rollback Parameters: entityClass - entity class ... rollback the LockTimeoutException will be thrown if the database locking failure causes
1

[ODB1] Chapter 6 - Persistent Objects

by reachability rule. Of course, if the transaction is ended with rollback() and not with commit
1

[ODB1] Chapter 4 - JDO Metadata

is never stored in the database. The main difference is that, on transaction rollback, it returns automatically

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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