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COMPILING JSP PAGES
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Even if JSP pages only contain taglibs and HTML source, you still need to verify that the taglibs are used correctly. If the pages contain some Java code, then you definitely need to make sure it is all correct. Normally the web application server compiles the pages; the validity of the page, the taglib references, or any Java code are unknown until you have deployed. This makes it easy to do some things: add new files to a live system, fix a deployed file, and even decouple page development from the code side of a project. This can be convenient, but is at odds with any rigorous web site development process, in which you write pages under SCM control, test them on staging, and then deploy them to the production site. In this process, run-time compilation introduces delays, as the JSP files need to be translated into Java before being compiled down to bytecodes on every server. What is worse, source code errors in the files do not show up until the pages are deployed on a web server. This puts it at odds with the build-test-deploy sequence we have been using up until now. Dynamic JSP compilation also forces the Java Development Kit to be installed on the server system, which can increase the security risk. If anyone were to gain write access to directories in a server, then new JSP pages could be written and executed under the identity of the web server. A locked-down Java web server makes this path of attack harder by not supporting dynamic JSP compilation. We can address this problem by compiling the JSP pages during the build. This finds syntax errors early, and enables deployment to locked-down Java servers. There has been an optional task to do this for Weblogic 4.5.1 for some time, but Ant 1.5 added a new factory-based task for compiling JSP pages, <jspc>. This task can support multiple back-end JSP compilers, and is very similar to the <javac> task in syntax. The task translates from .jsp files to .java files: the actual compilation to bytecodes needs a separate <javac> task. Both tasks are needed to fully test the pages. One complication in the process of compiling JSP pages is that application servers have the right to implement their own JSP-to-Java translation, so some vendors mandate their translation engine over a common standard. A different translation engine not only creates different code, it can even generate different class names for JSP pages that do not have a legal valid class name (any keyword or something like 123-45.jsp). You should never attempt to run any generated JSP servlet on a different platform from that of the <jspc> compiler: it will not work. However, even if the generated code does not work in the targeted application server, compiling down the JSP pages will find errors in the code faster than any other mechanism. The current Ant distribution only includes support for the Jasper JSP compiler of Tomcat 4.x, which is the reference implementation of the JSP 1.2 specification, and only generates Java code for the Servlet 2.3 standard. The Java code it generates will not work on previous implementations, as the source will not even compile against the
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CHAPTER 1 2
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older libraries. We recommend Tomcat 4.1 version, as it fixes bugs found in the Tomcat 4.0 release. Extra support for different application servers is inevitable. Check with the online documentation to see what the current support is. The latest unreleased version of Ant, the one at the head of the CVS repository, may have even broader support. 12.3.1 Installing the <jspc> task The <jspc> task is in the optional library, and it needs support libraries for the particular JSP compiler you intend to use. For Jasper, three support libraries listed are required; these are listed in table 12.1.
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Table 12.1 Library servlet.jar jasper-compiler.jar jasper-runtime.jar Libraries needed for compiling JSP pages with Jasper Location Servlet 2.3 API Tomcat 4.0 distributions Tomcat 4.0 distributions
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These libraries do not need to live in the Ant library directory, as the task takes a classpath that can point to these files. However, the task also needs an XML parser, so you must either add crimson.jar into the same directory as the rest of the Jasper files, or include a reference to the Ant run-time classpath with the element <pathelement path="${java.class.path}"/> inside the <jspc> task s classpath declaration. 12.3.2 Using the <jspc> task Listing 12.4 shows our target to compile the JSP pages in our project. Notice how we are running the <jspc> task against the source in our web application, not the JSP source pages in our web source directory. We will explain why in a moment.
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