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2.4 Setting up a project
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To help illustrate how to use Hibernate, you ll build a sample application Event Calendar 2005, an event/calendar-planning program which can be used to create events, schedule speakers, and manage attendees.
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Setting up a project
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An event calendar program is a good candidate for a Hibernate application for a number of reasons. Calendars and scheduling are common pieces of many business applications, so this should be familiar territory for many readers. In addition, Hibernate shines when it s applied to a rich domain model. A realistic event application has to handle a number of complex relationships, including conferences, lecture sessions, hotels, room reservations, and guests. Each chapter of this book expands the application a bit more, adding new relationships with Hibernate. But before you develop any code, you need to set up the project. Now that you have all the necessary building blocks (Hibernate, Ant, and a MySQL database), you can begin.
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2.4.1 Defining directories
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The first thing any successful project needs is a directory. Create it as follows:
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Create a directory, /work. This is a base directory where all your future projects can go. For now, you have one project to worry about: the new Event Calendar application. So, create a /work/calendar directory. This is will be referred to as the project directory from now on. Create an src/java directory in the project directory. All the Java sources files you create will go under this directory. It also leaves room for other source files that aren t .java files, like JSP, SQL, or Hibernate mapping files (hbm.xml), which you ll learn about in the next chapter. Open your favorite text editor or Integrated Development Environment (IDE)3, and create a file called build.xml in the project
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Discussing the right IDE can be about as contentious as talking religion or politics at a dinner party. That said, most of the modern IDEs have built-in support for Ant and even plug-ins for Hibernate, and can make managing a project a bit easier. The authors favorites include IDEA (www.intellij.com) and Eclipse (www.eclipse.org/).
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Installing and building projects with Ant
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directory. For the moment, leave the file empty. This will be the Ant build file for your Event Calendar program. Let s do a quick check to be sure you re on track. If all is well, you should have a directory structure that looks like this.
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/applications/apache-ant-1.6.2 /applications/hibernate-3.0 /applications/mysql /applications/mysql-connector-java-3.1.6 /work
With your project directory set up, let s go ahead and develop the Ant build file.
2.4.2 Ant 101
Your first Ant build file won t be too complicated, just enough to show the basics of what it can do. You re going to have it create a directory, compile a Java class, and run that class. You ll also learn about several important Ant concepts, including targets, tasks, paths, and properties. Typing everything will certainly build character, but you can also download the book s source code from www.manning.com/peak. Look in the ch02 directory for a file name build.xml, and open it in your preferred text editor (see listing 2.1). Throughout the chapter, you ll modify this file, and saving versions of it at various stages of development. Listing 2.1 First Ant build file, build.xml
Basic root element Defines reusable < xml version="1.0" > properties <project name="build.xml" default="build"> <property name="src.java.dir" location="src/java"/> <property name="build.classes.dir" location="build/classes"/> <path id="project.classpath"> Defines classpath <pathelement location="${build.classes.dir}"/> </path> <target name="init" > Task that creates <mkdir dir="${build.classes.dir}"/> directory to compile to
Setting up a project
</target> Task that compiles src files <target name="compile" depends="init" > <javac srcdir="${src.java.dir}" destdir="${build.classes.dir}"> <include name="**/EventCalendar.java" /> </javac> Task that runs </target> compiled classes <target name="build" depends="compile" > <java classname="com.manning.hq.ch02.EventCalendar" failonerror= true > <classpath refid="project.classpath"/> What you see if code </java> works <echo>If you see this, it works!!!</echo> </target> </project>
Since this may be the first build file you have seen, let s discuss some of the concepts Ant uses, in light of this example.
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