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Andrew Binstock: From Ant to Maven

By Andrew Binstock

October 15, 2007 — (Page 1 of 2)
During the past month, I have been doing what increasing numbers of developers are urging their peers to do: move projects from Ant to Maven 2. In my July 1 column, I discussed my mounting frustrations with Ant (“Moving Past Ant,” www.sdtimes.com/article/column-20070701-04.html). When I finally was no longer motivated to soldier on with Ant’s minimal delivery model, I finally put the time in to make the switch to Maven. I’m glad I did. There is lots to like about Maven.

Most visible is that Maven has a vision of a build cycle that consists of a sequence of commonly performed build steps. You indicate what you want done in certain steps, and that’s it. Maven has intelligent default behavior for the other steps, so the results tend to be what you expect. This build model enables Maven to embrace the paradigm of “convention over configuration” that was made famous by Ruby on Rails. With Maven, you roll with the basic model, making only small tweaks for project-dependent steps, rather than configuring every step in detail for Ant. Ant is more like the venerable make tool, which simply follows orders and serves as a meta-level task execution language.

The Maven model also has a useful end result in addition to the built project: a Web site with the reports generated by the various build steps. Maven creates a Web site with menu picks that reflect not only reports on standard operations, but any other documents or reports you request. For example, place a JDepend command in Maven to see the dependencies between packages in your Java project, and the results are displayed in an HTML report on your Maven Web site. Because of this, your project Web site as created by Maven always reflects the latest status of your project. Stick it on your developer intranet, and all team members know exactly where things stand.

This comes tantalizingly close to what is thought of as continuous integration (CI). However, it lacks a few crucial elements that CI provides: It does not monitor source-code repositories for any modification that could start up the build process, and it does not keep historical data on previous builds—the generated Web site is a single time slice. But if you add monitoring and history to Maven, you would have a barebones CI system. Because of this proximity, most CI systems support Maven 2.

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