android java qr code generator Connecting Hibernate in Java

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2.5.1 Connecting Hibernate
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So far, all you have done with Hibernate is download and install it. Let s put it to use in a project. You re going to modify the build.xml file so that all the Hibernate JAR files are in the classpath, along with a few more embellishments.
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Updating the build file
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If you re following the source code, to show the progress of each modification, you ve sequentially numbered the build files in the source code. If you want to run those (rather than modify your existing file), type ant f build2.xml to specify a file other than the default build.xml. For now, open build.xml and make the modifications shown in listing 2.2. Listing 2.2 Updated build file (build2.xml)
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< xml version="1.0" > Sets Hibernate version B <project name="build2.xml" default="build"> <property name="src.java.dir" value="src/java"/> <property name="build.classes.dir" value="build/classes"/> <property name="hibernate.version" value="3.0"/>
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Habits of highly effective build files
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<property name="hibernate.lib.dir" location="/applications/hibernate-${hibernate.version}" Sets base directory where /> Hibernate is installed <path id="project.classpath">
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<pathelement location="${build.classes.dir}"/> </path> D Defines classpath with Hibernate and all its JARs <path id="hibernate.lib.path" <fileset dir="${hibernate.lib.dir}/lib"> <include name="**/*.jar"/> </fileset> <fileset dir="${hibernate.lib.dir}"> <include name="hibernate3.jar"/> </fileset> </path> <target name="init" > <mkdir dir="${build.classes.dir}"/> </target> <target name="compile" depends="init" > <javac srcdir="${src.java.dir}" destdir="${build.classes.dir}"> <classpath refid="hibernate.lib.path"/> </javac> Adds Hibernate for compiling E </target> Uses new class F <target name="build" depends="compile" > <java classname="com.manning.hq.ch02.EventCalendar2"> <classpath refid="project.classpath"/> <classpath refid="hibernate.lib.path"/> Adds Hibernate G </java> to run Java file <echo>If you see this, it works!!!</echo> </target> <target name="clean"> H Adds self cleaning target <delete dir="${build.classes.dir}"/> </target> </project>
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B By parameterizing the version of Hibernate you re using, you can easily install a new version of Hibernate. Just download the new version, rename the directory to the exact version number (such as 3.0), and update the hibernate.version property. Build your project, and make sure everything works. No need to copy lots of JAR files.
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Installing and building projects with Ant
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C The hibernate.lib.dir shows a little more advanced usage of properties; part of the directory is static, with the version number as a property.
D Here you create a new path element that includes the hibernate3.jar
file and all the dependencies.
E This code adds the Hibernate classpath when compiling. F Change the class you re going to run to
com.manning.hq.ch02.EventCalendar2.
G Here you add the Hibernate classpath when running the Java file. H This lets you clean up the build artifacts for a fresh build.
The improved Ant build file now constructs a classpath for Hibernate and uses it for both compilation and running the Java class.
A sample class with Log4j
EventCalendar2 is a slightly modified version of the first class, EventCalendar, which uses a few classes from Hibernate and some of its
dependencies. The new class uses two dependencies: one from Hibernate and another from a Hibernate dependency, log4j.jar. Let s take a quick look the newly modified class:
package com.manning.hq.ch02; import org.hibernate.cfg.Configuration; import org.apache.log4j.*; public class EventCalendar2 { public static void main(String[] args) { BasicConfigurator.configure(); Configures Log4j logger Configuration configuration = new Configuration(); Logger log = Logger.getLogger(EventCalendar2.class); log.warn("Welcome to Event Calendar v2 2005."); } } Uses a Hibernate dependency
Habits of highly effective build files
There isn t much happening here. You configure Log4j, an opensource logging framework, to log messages to the command line. Then you create a basic configuration for Hibernate (which you ll learn more about in the next chapter). This doesn t accomplish much, but it s enough to ensure that if you haven t correctly set up your classpath, your file won t compile or run. The org.hibernate.cfg.Configuration class comes from the Hibernate3.jar file, and the org.apache.log4j.* classes comes from the log4j.jar file, which is in the hibernate/lib directory. Finally, you use your obtained Log4j logger to log a success message to console. This ensures that you have both sets of JAR files in the classpath. Now you can run your new build file. You should see this:
$ ant f build2.xml clean build Buildfile: build2.xml init: compile: [java] 0 [main] INFO org.hibernate.cfg.Environment - Hibernate 3.0.3 [java] 15 [main] INFO org.hibernate.cfg.Environment hibernate.properties not found [java] 15 [main] INFO org.hibernate.cfg.Environment - using CGLIB reflection optimizer [java] 15 [main] INFO org.hibernate.cfg.Environment - using JDK 1.4 java.sql.Timestamp handling [java] 31 [main] WARN com.manning.hq.ch02.EventCalendar2 Welcome to Event Calendar v2 2005. [echo] If you see this, it works!!! BUILD SUCCESSFUL Total time: 2 seconds
At the command line, you ran two targets from the build file. The clean target deletes the build/classes directory, to start with a fresh empty build/classes directory. Both your EventCalendar and EventCalender2 files are compiled successfully. Ant then runs the EventCalendar2 Java
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