Dave Johnson on open web technologies, social software and Java
A drop-in replacement with 50% to 400% speed improvement? That sounds too good to be true.
Matt Raible: The main improvement in Maven 3 is speed. It's been performance tuned to be 50% to 400% faster. Benchmarks (guaranteed by integration tests) include better: Disk I/O, Network I/O, CPU and Memory. Another new feature is extensibility so Maven is a better library rather than just a command-line tool. Now there's a library and APIs that you can use to do the things that Maven does. Plexus has been replaced with Guice and it's now much easier to embed Maven (Polyglot Maven and Maven Shell are examples of this).
Apparently it is not entirely true, at least not yet (Maven 3.0 is still in beta). I tried switching to Maven 3 for the Roller 5 build and hit several build errors related to class-loading and JPA byte-code enhancement.
I've been switching around between the Eclipse, Netbeans and IntelliJ IDEs at home and at work. I've found that fiddling around with multiple IDE specific project configurations and launchers and class-paths is no fun at all. That's one of the reasons I got interested in Maven. Yes, Maven is a build-system but it's also a sort of IDE portability solution. Maven projects can be loaded right into all the major Java IDEs as you can see in the screenshots below. IDEs can find your sources, resources, dependencies and via the Maven Jetty plugin even run your Java webapps from the IDE -- things that are not possible if you're using a custom Ant build-script as we were doing before with Roller.
Here some screenshots that show the various Maven IDE plugins and their dependency graph feature.Roller / Maven Eclipse 3.5 / M2Eclipse
Here's Roller loaded into Eclipse via the Maven M2 Eclipse plugin.
By the way, if you want detailed instructions for getting Roller 5 up and running in Eclipse with the Eclipse Web tooling, check-out Harald Wellman's helpful blog on the topic: Setting up Eclipse for Roller.Roller / Maven in Netbeans 6.8
Here's Roller loaded into Netbeans as a Maven project.Maven in IDEA IntelliJ 9.0
And here's Roller loaded into IDEA IntelliJ as a Maven project.
I'm not sure which I prefer yet.
I was a Maven hater and resisted it for a long time but over the years Maven has gotten much better, it's well supported in IDEs and as far as I can tell, Maven has replaced Ant as the de facto build system for Java projects. If you want new developers be able to easily build, debug and run your code via command or their favorite IDE then Maven is the way to go, and that's especially true for open source projects like Roller.
That's why I spent a couple of weekends learning Maven and converting Roller's build process from Ant to Maven (ROL-1849). The process of conversion wasn't too difficult. Getting dependencies under control was a pain, but it believe it will be a one time pain and a worthwhile one. What took the most time was figuring out how to get Maven to start Derby, create the Roller tables and then run Roller's JUnit tests. Also, getting Maven's Jetty plugin setup to run Roller was a little tricky but hopefully also a one-time pain. The result is that Roller now uses a standard and well known directory structure, dependencies are managed and it's easier for developers to get started with the codebase.
If you have Maven and Subversion installed on your computer then these commands will fetch the Roller source code, compile the code, run all JUnit tests and then build the Roller webapp:
svn co https://svn.apache.org/repos/asf/roller/trunk roller_trunk cd roller_trunk mvn install
And once all that is done, the following commands will start the Jetty app server, start the Derby database and start Roller at http://localhost:8080/roller, ready for testing, experimentation, etc.
cd weblogger-web mvn jetty:run-war
I think that's pretty damn useful.
Here are some articles/links that influenced my thinking on Maven recently: