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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.

<filterset begintoken="[[" endtoken ="]]"> <filter token="TIMESTAMP" value="${timestamp.isoformat}"/> </filterset>

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:

Although it is possible to manipulate Java files prior to compilation in a similar manner, we strongly advise against it. If you do want to do this, only filter a simple source file, such as a class containing nothing but static final declarations of constants. Have the <copy> task place it somewhere under the build directory, for example as build/generated, and then include an extra <src> element in <javac> to include it in the build. We have used a similar service provided by the <replace> task to modify ASP and HTML pages before deployment; it was the best way to configure the pages automatically. Another common use is to modify template deployment descriptors, such as web.xml and application.xml, with per-system configuration options. This lets you easily build different WAR or EAR files for different installations, each with its own custom settings such as database URLs and passwords. The easiest way to do this is to use <filtersfile>, which is another child element of <filterset> that you point at a Java properties file to act as the source of filter tokens. Each name=value assignment in the file declares a token and its value. You can then use a different properties file for each server: 138

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

<copy file="web/WEB-INF/web.xml" tofile="${dist.dir}/web.xml"> <filterset> <filtersfile file="${targetname}.properties"/> </filterset> </copy>

<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>

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:

Note that Ant properties are not resolved from inside the filter file itself, in contrast to the system s behavior when loading a property with <property file=".">, .. where properties used inside the file are expanded. You may also notice the <filter> task in Ant, which lets you specify a default filter for every move and copy that follows, but only with @ as a token prefix and suffix. This is dangerous; using an explicit filter for every copy where you need it is extra work, but is much less dangerous. Once set, global filtering remains set for the rest of the build. Do not use the <filter> task unless you really, really want to make life hard for yourself and the rest of the team.