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Element/Attribute Name name entity-result column-result Description Name of the sql-result-set-mapping. Name of the entity class. Columns returned in the query.

sequence-generator Corresponding annotation: @javax.persistence.SequenceGenerator A sequence generator is used for automatic generation of numbers using a database sequence. It is defined globally and may be used with one or more entities in the persistence unit.

Element/Attribute Name name sequence-name initial-value Description Name of the sequence generator. Name of the database sequence. Initial value generated when the sequence generator is used. continued on next page

msg = new MimeMessage(mailSession); Creates and populates an email message msg.setFrom(); msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse( recipient , false)); msg.setSubject("Important Message"); msg.setText(text);

Listing 11-21. An Example of Use for the setRollbackOnly Method 01 02 03 04 05 06 07 08 09 10 11 [...] public void setBalance(double amount) throw InsufficientFundsException { if( balance >= 0 ) { balance = amount; } else { context.setRollbackOnly(); throw new InsufficientFundsException(balance); } } [...]

table-generator Corresponding annotation: @javax.persistence.TableGenerator A table generator is used for automatic generation of numbers using a sequence table. It is defined globally and may be used with one or more entities in the persistence unit.

Element/Attribute Name name table catalog schema pk-column-name value-column-name pk-column-value Description Name of the table generator. Name of the sequence table. Catalog containing the table. Schema containing the table. Name of the primary key column in the table. Name of the column that stores the primary key value. Column that stores a value to distinguish table generators from one another. Initial value. The amount the JPA provider will increase while allocating primary key values.

Transport.send(msg); System.out.println("Sent Email to: "+rcpt); } catch(Exception e){ e.printStackTrace(); } } }

mapped-superclass Corresponding annotation: @javax.persistence.MappedSuperClass. Most subelements correspond to an annotation. The mapped-superclass element has three attributes and several subelements. The attributes class, access-type, and meta-data-complete are used to specify the name of the mapped superclass, access type (i.e., field or property), and whether the XML metadata specified is complete.

As you can see, the declarative transaction management is not an ideal solution. The following sections show how AOP can be used in its place.

Description Name of the primary key class if used. Set to TRUE if you want to exclude firing of the default listener for the entity. Set to TRUE if you want to exclude firing of the superclass listener for the entity. Defines the entity listeners for the superclass. Name of the prepersist method in the entity class. Name of the postpersist method in the entity class. Name of the preremove method in the entity class. Name of the postremove method in the entity class. Name of the preupdate method in the entity class. Name of the postupdate method in the entity class. Name of the postload method in the entity class. Defines the attributes/persistence fields of the mapped class.

For EJBs, the mail session object should be retrieved from the EJB container as a resource. After you ve retrieved the email session object, it s just a matter of creating and populating a message instance before sending it using the Transport object. However, with large emails, you should be aware of the time clients may have to wait when invoking the sendEmail() method.

entity-listeners pre-persist post-persist pre-remove post-remove pre-update post-update post-load attributes

attributes The attributes element is used to define mapping of persistence and association fields. There is no equivalent annotation for the attributes element; each element of attributes corresponds to an annotation.

If you are concerned about holding a lock on an object while waiting for the sendEmail() method to complete, you could always send the email asynchronously using a message-driven bean. For more about performing this and other tasks with message-driven beans, see chapter 6.

Element/Attribute Name id-class id basic version many-to-one one-to-many one-to-one Description Designates the primary key class. Designates the id field of the entity. Designates a field to be a direct-to-field mapping. Defines the attribute to the version field used for optimistic locking. Defines the field to be many-to-one association. Defines the field to be one-to-many association. Defines the field to be one-to-one association. continued on next page