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Hibernate reads this row and marshals two objects from the result. It connects them with a reference from Item to User, the seller association. If an Item doesn t have a seller all u.* columns are filled with NULL. This is why Hibernate uses an outer join, so it can retrieve not only Item objects with sellers, but all of them. But you know that an Item has to have a seller in CaveatEmptor. If you enable <many-to-one not-null="true"/>, Hibernate executes an inner join instead of an outer join. You can also set the eager join fetching strategy on a collection:

It is beyond the scope of this book to cover the Jakarta Commons Logging API, although its use is quite simple. Every event has to be logged in a category; here we use the class name. As noted in the class comments, you must not use a logging implementation that writes to System.out or System.err because of the infinite loop possibility. Ant traps System.out and System.err calls and forwards them on to attached listeners through the messageLogged method. 20.2.2 Using Log4j logging capabilities Ant includes both a Log4jListener and a CommonsLoggingListener. The Log4jListener was developed before the Commons Logging API existed, both of which can output to Log4j. The CommonsLoggingListener is recommended in environments that need to be flexible in which logging API is used, although an additional dependency is required beyond the Log4j dependency: commons-logging.jar. We demonstrate Log4j capabilities using the CommonsLoggingListener, although this would work just as well using the Log4jListener. When an event is logged from an application, it is logged to a specific category. Categories are hierarchical, based on a dotted textual representation. Ant s CommonsLoggingListener class uses as the category name the fully qualified class name of the context provided by the BuildEvent. Each event is logged to a priority level of DEBUG, WARN, INFO, ERROR, or FATAL (note: FATAL is not used by the CommonsLoggingListener, but the other priority levels are). Log4j initializes itself from a log4j.properties file (or using ANT_OPTS=-Dlog4j.configuration=<filename>). The Log4j configuration properties file could reside wherever most appropriate, but by default, it is picked up from the current directory. CommonsLoggingListener fires every event, including debugging information, through Log4j1 which in turn allows configuration control over what events are logged, where they are logged, and what format is used.

<class name="Item" table="ITEM"> ... <set name="bids" inverse="true" fetch="join"> <key column="ITEM_ID"/> <one-to-many class="Bid"/> </set> </class>

Consult the Jakarta Commons Logging API for configuration details. Log4j is the default logging implementation if Log4j is found in the classpath.

If you now load many Item objects, for example with createCriteria(Item. class).list(), this is how the resulting SQL statement looks:

The CommonsLoggingListener is useful in a continuous integration process. In an environment where builds are running every time code is checked into the source code repository, it is important to be able to filter the log information so that you are alerted only when something goes wrong rather than being inundated by routine successful build notifications. It is also important to keep detailed logs for reference when tracking down a problem. However, it s not important to keep too much historical information, as it s not useful for very long. Integrating Ant with Log4j gives us these powerful capabilities with minimal configuration. Here is the log4j.properties file that accomplishes these goals:

The resultset now contains many rows, with duplicate data for each Item that has many bids, and NULL fillers for all Item objects that don t have bids. Look at the resultset in figure 13.5. Hibernate creates three persistent Item instances, as well as four Bid instances, and links them all together in the persistence context so that you can navigate this graph and iterate through collections even when the persistence context is closed and all objects are detached. Eager-fetching collections using inner joins is conceptually possible, and we ll do this later in HQL queries. However, it wouldn t make sense to cut off all the Item objects without bids in a global fetching strategy in mapping metadata, so there is no option for global inner join eager fetching of collections. With Java Persistence annotations, you enable eager fetching with a FetchType annotation attribute:

log4j.rootCategory=INFO,file log4j.category.org.apache.tools.ant.Project=INFO,file,mail log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.layout=org.apache.log4j.TTCCLayout log4j.appender.file.file=build.log log4j.appender.file.maxBackupIndex=3 log4j.appender.file.maxFileSize=100KB log4j.appender.mail=org.apache.log4j.net.SMTPAppender log4j.appender.mail.layout=org.apache.log4j.HTMLLayout log4j.appender.mail.Threshold=ERROR log4j.appender.mail.SMTPHost=localhost log4j.appender.mail.bufferSize=1 log4j.appender.mail.to=erik@example.org log4j.appender.mail.from=erik@example.org log4j.appender.mail.subject=Build Failure!

@Entity public class Item { ... @ManyToOne(fetch = FetchType.EAGER) private User seller; @OneToMany(fetch = FetchType.EAGER) private Set<Bid> bids = new HashSet<Bid>(); ... }

This mapping example should look familiar: You used it to disable lazy loading of an association and a collection earlier. Hibernate by default interprets this as an