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The development team s choice to provide an Ant task for deployment, rather than a GUI tool, is a welcome sign of how Ant has become the standard build tool for projects, and it demonstrates how developers of commercial products can serve their users by supporting Ant explicitly. Of course, it would be nice to have source access, so we could write a nested element that lets us specify a deployment URI for each element uploaded. It would also be nice to see vendors plugging into the <serverdeploy> task. There is currently one major flaw with this task it does not work from a normal Ant execution environment, only the vendor s RadPak Ant GUI tool. We don t know why this is the case, but it stops you deploying via this task from any automated build and deploy process. 18.6.4 Other servers There are many more application servers, each with its own deployment process, but without explicit Ant support. We leave deploying to these servers as an exercise to the reader. The process for creating a build file to deploy to each server is usually the same: look at its documentation and sample deployment scripts, then replicate the steps in Ant. URL-based manager applications succumb to <get> requests; helper programs can be called with <java> and <exec>, and any server that supports hot deployment is amenable to <copy> calls. The batch files are often the most informative source of information, as they show the classpaths and parameters needed to call their Java-based programs. You can replace each such script file with a single <java> call in your application. All in all, we estimate that it can take a day or two to get a working build file to deploy to a new server type, but once written it can be reused again and again. Perhaps the Apache Ant project should put together a repository of deployment targets for the usual suspects of application servers.
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Trust, but verify. The Russian proverb that Reagan quoted when dealing with the Warsaw Pact in treaties on Strategic Armaments also applies to the deployment problem. Even though the individual components of a production deployment process are there to help you, together they can be an implacable obstacle. We already have the HttpUnit tests to verify that the system works; we wrote those in section 12.6. These make sure that our application is working. There is just one remaining question: how can you be sure that deployment worked We may not be able to tell from the functional tests whether the version of the WAR file we just built was the one we just built, or whether an older version is still running. This is rare, but we have encountered it when getting deployment working, and again when a system was misconfigured.
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What are we to do The answer is actually very simple. For every build, we will create a timestamp file that gets included in the web application. Ant can then compare the local timestamp with the copy served up by the just deployed application, and fail the build if they are different. 18.7.1 Creating the timestamp file First, we give the file a name and a place.
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<property name="timestamp.filename" value="timestamp.txt"/> <property name="timestamp.path" location="${build.dir}/${timestamp.filename}"/>
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The file will be served from the web site by the same name, such as
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http://127.0.0.1:8080/antbook/timestamp.txt
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If after deployment the remote and local files have different contents, then deployment has failed. We need to put a timestamp in the file, of course, which we do by getting the current date and time into a property, then saving this to a file with <echo>.
<target name="make-timestamp" depends="init" > <tstamp> <format property="buildtime" pattern="yyyy-MM-dd'T'HH:mm:ss" /> </tstamp> <echo file="${timestamp.path}" message="build.timestamp=${buildtime}" /> </target>
We could use <propertyfile> for similar effect, but we prefer the terse one-line timestamp for easier-to-read error messages. 18.7.2 Adding the timestamp file to the application To include this file in the application, we add another fileset to the <war> task and a new dependency to the target:
<target name="make-war" depends="compile,make-webxml,make-web-docs,make-timestamp,make-soap-api"> <war destfile="${warfile}" compress="false" update="true" webxml="${build.webinf.dir}/web.xml"> <classes dir="${build.classes.dir}"/> <webinf dir="${build.dir}" includes="index/**"/> <webinf dir="${struts.dir}/lib" includes="*.tld,*.dtd"/> <webinf dir="${build.webinf.dir}" includes="antbook.tld"/> <fileset dir="${build.dir}" includes="${timestamp.filename}"/> <fileset dir="web"/> ... </war> </target>
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