Chapter 6. Hibernate on JBoss Web Server

Hibernate is an object-relational mapping framework. It is provided by the JBoss Web Server Maven Repository (jboss-web-server-5.0.0-maven-repository.zip). This packaged version is used on all supported platforms.

Hibernate is used in the same way it is used for a regular Tomcat installation: the Hibernate JAR files are added into a deployment WAR file. Tomcat provides a default connection pooling mechanism, which is defined in context.xml. However, persistence.xml and web.xml are also required. The example below shows a configuration with the Tomcat connection pooling mechanism.

/META-INF/context.xml defines the connection pools Tomcat should create.

context.xml

<Context>
  <Resource
    name="jdbc/DsWebAppDB"
    auth="Container"
    type="javax.sql.DataSource"
    username="sa"
    password=""
    driverClassName="org.h2.Driver"
    url="jdbc:h2:mem:target/test/db/h2/hibernate"
    maxActive="8"
    maxIdle="4"/>
</Context>

<Context>
  <Resource
    name="jdbc/DsWebAppDB"
    auth="Container"
    type="javax.sql.DataSource"
    username="sa"
    password=""
    driverClassName="org.h2.Driver"
    url="jdbc:h2:mem:target/test/db/h2/hibernate"
    maxActive="8"
    maxIdle="4"/>
</Context>

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/WEB-INF/classes/META-INF/persistence.xml is a JPA configuration file. It defines how the application configures Hibernate to consume connections from the Tomcat pool. If you are using the Hibernate API directly, use a similar configuration to that shown in hibernate.cfg.xml.

persistence.xml

<persistence version="1.0"
  xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

  <persistence-unit name="dswebapp">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" />
      <property name="hibernate.connection.datasource" value="java:comp/env/jdbc/DsWebAppDB"/>
    </properties>
  </persistence-unit>
</persistence>

<persistence version="1.0"
  xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

  <persistence-unit name="dswebapp">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" />
      <property name="hibernate.connection.datasource" value="java:comp/env/jdbc/DsWebAppDB"/>
    </properties>
  </persistence-unit>
</persistence>

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/WEB-INF/web.xml is a regular web application deployment file, which instructs Tomcat which datasource to consume. In the example below, the datasource is jdbc/DsWebAppDB.

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

 <resource-env-ref>
  <resource-env-ref-name>jdbc/DsWebAppDB</resource-env-ref-name>
  <resource-env-ref-type>javax.sql.DataSource</resource-env-ref-type>
 </resource-env-ref>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

 <resource-env-ref>
  <resource-env-ref-name>jdbc/DsWebAppDB</resource-env-ref-name>
  <resource-env-ref-type>javax.sql.DataSource</resource-env-ref-type>
 </resource-env-ref>
</web-app>

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For details, see the Hibernate documentation for JBoss Web Server.

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Chapter 6. Hibernate on JBoss Web Server

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