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Hibernate with Tomcat Tomcat isn t a Java EE application server; it s just a servlet container, albeit a servlet container with some features usually found only in application servers. One of these features may be used with Hibernate: the Tomcat connection pool. Tomcat uses the DBCP connection pool internally but exposes it as a JNDI datasource, just like a real application server. To configure the Tomcat datasource, you need to edit server.xml, according to instructions in the Tomcat JNDI/JDBC documentation. Hibernate can be configured to use this datasource by setting hibernate.connection.datasource. Keep in mind that Tomcat doesn t ship with a transaction manager, so you still have plain JDBC transaction semantics, which Hibernate can hide with its optional Transaction API. Alternatively, you can deploy a JTA-compatible standalone transaction manager along with your web application, which you should consider to get the standardized UserTransaction API. On the other hand, a regular application server (especially if it s modular like JBoss AS) may be easier to configure than Tomcat plus DBCP plus JTA, and it provides better services.

To fully integrate Hibernate with JTA, you need to tell Hibernate a bit more about your transaction manager. Hibernate has to hook into the transaction lifecycle, for example, to manage its caches. First, you need to tell Hibernate what transaction manager you re using:

There are several ways to optimize queries. Optimization consists of tasks such as rewriting the query, de-normalizing or normalizing tables, adding indexes, removing indexes, or a combination of these tasks.

<hibernate-configuration> <session-factory> <property name="hibernate.connection.datasource"> java:/MyDatasource </property>

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The graphical execution plan is a great tool to use when optimizing queries. This chapter discusses several execution plans. Some of the items that you should look for in the execution plan are shown in Table 7-3.

<property name="hibernate.dialect"> org.hibernate.dialect.HSQLDialect </property> <property name="hibernate.transaction.manager_lookup_class"> org.hibernate.transaction.JBossTransactionManagerLookup </property> <property name="hibernate.transaction.factory_class"> org.hibernate.transaction.JTATransactionFactory </property> ... </session-factory> </hibernate-configuration>

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You need to pick the appropriate lookup class for your application server, as you did in the preceding code Hibernate comes bundled with classes for the most popular JTA providers and application servers. Finally, you tell Hibernate that you want to use the JTA transaction interfaces in the application to set transaction boundaries. The JTATransactionFactory does several things:

Table 7-3

Rob is concerned that the network card on a file server he maintains needs to be upgraded from 10 megabits to 100 megabits. He monitors the average Output Queue Length on the network card over a period of a normal working day. Which values should be a cause for concern and indicate that Rob should upgrade the network card (Select all that apply.)

It enables correct Session scoping and propagation for JTA if you decide to use the SessionFactory.getCurrentSession() method instead of opening and closing every Session manually. We discuss this feature in more detail in chapter 11, section 11.1, Propagating the Hibernate session. It tells Hibernate that you re planning to call the JTA UserTransaction interface in your application to start, commit, or roll back system transactions. It also switches the Hibernate Transaction API to JTA, in case you don t want to work with the standardized UserTransaction. If you now begin a transaction with the Hibernate API, it checks whether an ongoing JTA transaction is in progress and, if possible, joins this transaction. If no JTA transaction is in progress, a new transaction is started. If you commit or roll back with the Hibernate API, it either ignores the call (if Hibernate joined an existing transaction) or sets the system transaction to commit or roll back. We don t recommend using the Hibernate Transaction API if you deploy in an environment that supports JTA. However, this setting keeps existing code portable between managed and nonmanaged environments, albeit with possibly different transactional behavior.

A thick arrow represents a large number of rows moving from one operation in the execution plan to another. The greater the number of rows transferred from one operation to another, the thicker the arrow. If a hash operation is used to handle clauses such as GROUP BY and JOIN, it often means that an appropriate index did not exist to optimize the query.

There are other built-in TransactionFactory options, and you can write your own by implementing this interface. The JDBCTransactionFactory is the default in a nonmanaged environment, and you have used it throughout this chapter in

the simple Hello World example with no JTA. The CMTTransactionFactory should be enabled if you re working with JTA and EJBs, and if you plan to set transaction boundaries declaratively on your managed EJB components in other words, if you deploy your EJB application on a Java EE application server but don t set transaction boundaries programmatically with the UserTransaction interface in application code. Our recommended configuration options, ordered by preference, are as follows:

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