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Tutorial
11

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
11

How to upgrade from ObjectDB 1.0?

. ObjectDB 2.0 uses optimistic transactions by default (the default was datastore transactions in
JDO Doc
11

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
10

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
10

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
10

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
JDO Doc
10

javax.jdo.spi.StateInterrogation

transaction. Parameters: pc - the instance. Returns: a copy of the ObjectId of the parameter instance as of the beginning of the transaction. Since: JDO 2.0 See Also: PersistenceManager.getObjectId(Object pc ... if there is one. Return the associated PersistenceManager if there is one. Transactional and persistent
JDO Doc
9

javax.jdo.JDOHelper

whether the instance is persistent, transactional, dirty, new, deleted, or detached ... within the current transaction. Parameters: pc - the PersistenceCapable instance. Returns: a copy of the ObjectId of the parameter instance as of the beginning of the transaction. Since: JDO 1.0
JPA Doc
9

javax.persistence.TypedQuery

for a criteria query TransactionRequiredException - if there is no transaction QueryTimeoutException ... and the transaction is rolled back Since: JPA 1.0 int getFirstResult() The position of the first result the query ... back TransactionRequiredException - if a lock mode has been set and there is no transaction PessimisticLockException