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Listing 12.4 How to compile all JSP pages in a web application
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<property name="build.jspc.java.dir" location="${build.dir}/jspc/java"/> <property name="build.jspc.classes.dir" location="${build.dir}/jspc/classes"/> <path id="jasper.classpath"> <fileset dir="${jasper.dir}"> <include name="**/*.jar"/> </fileset> </path> <target name="compile-jsp" depends="unwar"> <mkdir dir="${build.jspc.classes.dir}" /> <mkdir dir="${build.jspc.java.dir}" />
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COMPILING JSP PAGES
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<jspc Creates the Java files srcdir="${war.expanded.dir}" destdir="${build.jspc.java.dir}" > <include name="**/*.jsp"/> <classpath refid="jasper.classpath"/> </jspc> <javac Compiles the Java files debug="${build.debug}" includeAntRuntime="false" srcdir="${build.jspc.java.dir}" destdir="${build.jspc.classes.dir}" > <classpath> <path location="${war.expanded.dir}/WEB-INF/classes"/> <fileset dir="${war.expanded.dir}/WEB-INF/lib"> <include name="**/*.jar"/> </fileset> <path refid="jasper.classpath"/> </classpath> </javac> </target>
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This compile-jsp target compiles the JSP pages into a temporary directory using <jspc>, then runs <javac> over the created files. When run, it will state how many files it compiled down:
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compile-jsp: [mkdir] Created dir: C:\AntBook\app\webapp\build\jspc\classes [mkdir] Created dir: C:\AntBook\app\webapp\build\jspc\java [jspc] Compiling 9 source files to C:\AntBook\app\webapp\build\jspc\java [javac] Compiling 9 source files to C:\AntBook\app\webapp\build\jspc\classes BUILD SUCCESSFUL Total time: 29 seconds
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Having shown the task working, we should explain some of the details. As with <javac>, the task takes a srcdir and a destdir attribute, both of which are mandatory. We chose a new directory under build.dir to store the generated Java files. The source directory is more interesting: we have to run the task against our unzipped WAR file, rather than the original source. This is because the <jspc> task needs to find a directory WEB-INF somewhere above the source files. It needs this directory to determine the root of the web application, used for references in the JSP pages, such as:
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<%@ taglib uri="/WEB-INF/antbook.tld" prefix="happy" %> <%@ include file="/html/sometext.html %>
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CHAPTER 1 2
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It also uses the directory tree between this root and the JSP pages to determine where to place the output files; files that the task creates in a matching directory tree under the destination directory. Although we do have a WEB-INF directory under the directory containing our JSP source files, it is incomplete: it does not contain the files we have created using XDoclet. We don t want to risk the source by copying generated files into the source tree, so we have to copy the source files into some appropriately structured folders in the build directory tree. As the make-war and unwar targets do exactly that, we just mark our new target s dependencies appropriately and point <jspc> at the expanded WAR file. If you are not dynamically generating web.xml and TLD metadata, you do not need to do all this. One advantage of running <jspc> against the expanded WAR file is that we can follow this by running <javac> against the generated Java files, using the libraries shipping in the WAR file. This verifies not only that the JSP pages are valid, but also that only those libraries that we are distributing will be available for the JSP pages to use. There is one complication: the generated pages also need to link against the Jasper run time, and perhaps even the J2EE JAR file. These substitute for the libraries provided by the application server. For example, in listing 12.4, we have to include the Jasper run time. Having written this target, what do we do with it Currently we think the best use of the JSP compilation target is to validate the code prior to deploying to a web server. We enforce this by modifying our dist target to depend on the JSP pages compiling successfully:
<target name="dist" depends="make-war,compile-jsp" description="creat a distribution" />
With this addition, we know that it is almost impossible to deploy our project s WAR file if the JSP pages are incorrect. We say almost, because there are some flaws with the <jspc> task that could cause problems. First, the dependency checking is not smart enough to track changes files included into the JSP pages, or referenced taglib descriptors. If a TLD is changed, the JSP pages may need a rebuild, but <jspc> will not notice. Regular clean builds are the only solution. There are other issues too, some of which need addressing inside Jasper, and then the fixes pulled back into Ant. Using an up-to-date copy of Jasper is important, as is checking the online Ant documentation; maybe even the bug database (http://nagoya.apache.org/bugzilla/) for any Ant bugs with the word JSPC in the title. 12.3.3 JSP compilation for deployment Moving beyond compilation for testing, we come to compilation for deployment, and for deployment to more secure servers. For this to be viable using the Jasper compiler with <jspc>, the target system must be running a compatible version of the servlet engine, which currently means Tomcat 4.x. We are not convinced that the combination of <jspc> and the Jasper libraries are mature or stable enough for precompilation yet. 291
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