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This time the <javac> task does need to compile the source file, a fact it prints to the log. It still skips the build.xml file, printing this fact out before it actually compiles any Java source. This provides a bit more insight into the workings of the task: it builds a list of files to compile before it sends the set to the compiler. Actually, as you can discover by looking at the Ant source, it hands off this entire list of Java files to the compiler in one go. By default the Java-based compiler that came with the JDK is used, from inside the same JVM as Ant itself. This makes the build fast, even though it is all written in Java and has to parse an XML file before it even begins to do any work. A final point of interest from these verbose runs is that we are clearly running under Linux, while the earlier examples were clearly running on a Windows PC. We decided to test the build on a different computer. Ant does not care what platform you are running on, as long as it is one of the many it supports. The same build file can compile, package, test, and deliver the same source files on whatever platform it is executed on, which helps unify a development team where multiple system types are used for development and deployment. Don t worry yet about running the program we compiled. We need to get the compilation process under control before actually running it.

For each of the built-in mapping types, a constant is defined by the class org.hibernate.Hibernate. For example, Hibernate.STRING represents the string mapping type. These constants are useful for query parameter binding, as discussed in more detail in chapters 14 and 15:

The build file is now compiling Java files, but the build process is messy. Source files, output files, the build file: they are all in the same directory. If this project gets any bigger, things will get out of hand. Before that happens, we must impose some structure. The structure we are going to impose is the de facto standard in Ant, but it is imposed for a reason, a reason driven by the three changes we want to make to the project. We want to automate the cleanup in Ant. If done wrong, this could accidentally delete source files. To minimize that risk, you should always cleanly separate source and generated files into different directories. We want to place the Java source file into a Java package. We want to create a JAR file containing the compiled code. This should be placed somewhere that can also be cleaned up by Ant. To add packaging and clean-build support to the build, we have to isolate the source, intermediate, and final files. Once you have separated source and generated files, it is easy and safe to automate cleanup of the latter, making it easy to perform clean builds. A clean build is always preferable to an incremental build as there is no chance of old classes sneaking into the build with out-of-date constants or method declarations. It is good to get into the habit of doing clean builds. Do this not just when you

session.createQuery("from Item i where i.description like :desc") .setParameter("desc", d, Hibernate.STRING) .list();

Note that you may as well use the setString() argument binding method in this case. Type constants are also useful for programmatic manipulation of the Hibernate mapping metamodel, as discussed in chapter 3. Hibernate isn t limited to the built-in mapping types. We consider the extensible mapping-type system one of the core features and an important aspect that makes Hibernate so flexible.

For this reason, we are not including an example of this, leaving it as an exercise for the reader instead. The generated class files need to be included into the class tree of the web application, and the servlet declarations created. You can accomplish the latter by setting the webinf attribute of the <jspc> task to the name of the file you want. This file needs to go in web.xml, somehow, perhaps by using XDoclet. Trying to automate this with the approach we use creating the WAR file, unzipping it, then building the JSP pages leads to a recursive model. After creating this transient WAR file, you need to create a new one containing the final web.xml and the new classes. You could perhaps do this by building straight into the expanded WAR file, overwriting its web.xml, then <jar> this up for deployment. 12.3.4 Other JSP compilation tasks WebLogic has its own JSP compiler, <wljspc>, which predates the <jspc> by many months. The documentation states that it has not been widely tested, and so it should be used with caution. Now that Ant 1.5 provides in <jspc> an extensible task for JSP compilation, we would hope that the vendors of web application servers provide plug-in compilers for this task, and if not these vendors, then people in the Ant community. The external tasks page on the Ant web site (http://jakarta.apache.org/ant/external.html) will be a good starting point.