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If either checks fail, the user should be informed of the reason; if both checks are successful, the user should be informed that the bid has been placed. These checks are the business rules. If a failure occurs while accessing the database, users should be informed that the system is currently unavailable (an infrastructure concern). Let s see how you can implement this in a web application.

In larger build environments in which many components, products, and build files exist, centralizing common pieces used by builds is important. Using a central properties file is a good technique for defining the name/class pairs for all third-party or custom tasks. Classpath issues make this more difficult because all dependencies of all tasks defined need to be in a single classpath for <taskdef>. Another technique is to use XML entity references, as demonstrated in chapter 9. In our application build system, we created a taskdef.xml file containing:

Next, a name that can be easily referenced later, projectclasspath, is defined as a shortcut to all libraries in the library directory of the project Another shortcut for a pattern that will come in handy is defined as metafiles You need to handle configuration and metadata files separately in the processing of the build, using this filter The clean target removes all created and compiled files, and cleans the project The last three targets, compile, copymetafiles, and run, should be selfexplanatory Running the application depends on the compilation of all Java source files, and the copying of all mapping and property configuration files to the build directory Now, execute ant compile in your WORKDIR to compile the Hello World application You should see no errors (nor any warnings) during compilation and find your compiled class files in the bin directory.

Also call ant copymetafiles once, and check whether all configuration and mapping files are copied correctly into the bin directory Before you run the application, start the database management system and export a fresh database schema Starting the HSQL database system Hibernate supports more than 25 SQL database management systems out of the box, and support for any unknown dialect can be added easily If you have an existing database, or if you know basic database administration, you can also replace the configuration options (mostly connection and dialect settings) you created earlier with settings for your own preferred system To say hello to the world, you need a lightweight, no-frills database system that is easy to install and configure A good choice is HSQLDB, an open source SQL database management system written in Java.

<path id="xdoclet.classpath"> <pathelement location="${xdoclet.jar}"/> <pathelement location="${log4j.jar}"/> <!-- javadoc is needed --> <pathelement path="${java.class.path}"/> <path refid="test.classpath"/> </path> <taskdef name="document" classname="xdoclet.doc.DocumentDocletTask" classpathref="xdoclet.classpath"/> <taskdef name="xdoclet" classname="xdoclet.DocletTask" classpath="${xdoclet.jar}"/> <path id="checkstyle.classpath"> <pathelement location="${checkstyle.jar}"/> </path> <taskdef name="checkstyle" classname="com.puppycrawl.tools.checkstyle.CheckStyleTask" classpathref="checkstyle.classpath"/>

It can run in-process with the main application, but in our experience, running it stand-alone with a TCP port listening for connections is usually more convenient You ve already copied the hsqldbjar file into the library directory of your WORKDIR this library includes both the database engine and the JDBC driver required to connect to a running instance To start the HSQLDB server, open up a command line, change into your WORKDIR, and run the command shown in figure 24 You should see startup messages and finally a help message that tells you how to shut down the database system (it s OK to use Ctrl+C) You ll also find some new files in your WORKDIR, starting with test these are the files used by HSQLDB to store your data If you want to start with a fresh database, delete the files between restarts of the server..

Each build file that will be using these tasks specifies the entity reference at the top of its build.xml: