About Transactional

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Manual
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Detached Entity Objects

method, which clears an EntityManager's persistence context. Rolling back a transaction - either by ... transaction when merge is called because operations that might modify the database require an active transaction. Cascading Merge Marking a reference field with CascadeType.MERGE (or CascadeType
Tutorial
10

Step 3: Define an EJB Session Bean

(because it is annotated with the @PersistenceContext annotation). Handles transactions automatically ... transaction begin and commit. The next step is adding a Servlet Class that will serve as the application controller.
Result
10

How to upgrade from ObjectDB 1.0?

. ObjectDB 2.0 uses optimistic transactions by default (the default was datastore transactions in
Manual
10

JPA Lifecycle Events

throws an exception within an active transaction, the transaction is marked for rollback
Tutorial
10

Step 3: Define an EJB Session Bean

with the @PersistenceContext annotation). Handles transactions automatically using JTA - no need to wrap every operation that modifies the database (such as persist) by transaction begin and commit
JDO Doc
10

javax.jdo.spi.PersistenceCapable

is persistent, transactional, dirty, new, deleted, or detached; and to get its associated ... is only valid within the current transaction. If the JDO identity is being changed in the transaction, this method returns the object id as of the beginning of the current transaction. Returns: a copy
JDO Doc
10

javax.jdo.spi.StateManager

identity of the calling instance. If the JDO identity is being changed in the current transaction, this method returns the identity as of the beginning of the transaction. Parameters: pc - the calling ... the current transaction, this method returns the current identity as changed in the transaction
JDO Doc
9

javax.jdo.PersistenceManagerFactory

transactions. If any PersistenceManager instances have an active transaction, throw a JDOUserException, with one nested JDOUserException for each PersistenceManager with an active Transaction. If there are no active transactions, then close all PersistenceManager instances obtained from
JPA Doc
9

javax.persistence.EntityTransaction

javax.persistence Interface EntityTransaction Interface used to control transactions on resource ... begin() Start a resource transaction. Start a resource transaction. Throws: IllegalStateException - if isActive() is true Since: JPA 1.0 void commit() Commit the current resource transaction, writing
JPA Doc
9

javax.persistence.LockModeType

.OPTIMISTIC_FORCE_INCREMENT are the following. If transaction T1 calls for a lock of type LockModeType ... phenomena can occur: P1 (Dirty read): Transaction T1 modifies a row. Another transaction T2 then reads that row and obtains the modified value, before T1 has committed or rolled back. Transaction T2