Raible Designs

Welcome to 2005

Happy New Year y'all! 2004 was a great year for this website. It was also an awesome year personally. I have a new baby, a new house and a new bus. I learned way more than I thought I would about Spring, WebWork, Tapestry and JSF. And I spoke at a couple conferences, which I certainly didn't anticipate. In 2005, I hope to step back a bit and spend less time working and more time being a good father and husband. Restoring the bus is my major goal I hope to accomplish this year.

Here's this site's stats for 2004:

New AppFuse Developer: Nathan Anderson

Nathan Anderson has been a huge help on the AppFuse mailing list lately. He's also setup an IRC Channel and keeps the wiki up-to-date with all kinds of tips and tricks.

I've asked Nathan to join AppFuse as a Committer and he's accepted the offer. Welcome aboard Nathan!

Happy Holidays!

We're heading for the airport in the next hour. I stayed up and tried to finish off Chapter 11. I still have a few more hours to go, but I made a good dent in it. Our flight leaves in 2 hours (6 a.m.) and we'll be in West Palm Beach, FL until the 31st. Should be a fun day - no sleep, 2 kids and we don't arrive until 3 this afternoon.

Enjoy your holidays - I know I will (after today is over with).

If you could add another framework to AppFuse, which would it be?

If you could add another web framework option to AppFuse, which one would it be and why? Please keep in mind it already includes Struts, Spring, WebWork, JSF and Tapestry.

AppFuse Tip: Backup and Restore Data with DbUnit

One of the nice things about having DbUnit integrated into AppFuse is you can easily import and export data. I've often used this feature to export a test database (or even production) into my development environment to try and reproduce data-related errors. Here's how to do it:

1. Run "ant db-export -Ddatabase.host=otherhost". This exports all the data into an XML file named "db-export.xml" in the current directory.
2. Run "ant db-load -Dfile=db-export.xml" to import the data into your local database.

I've used the db-export task for other things too - like populating the database through the UI and then updating the test data. All you have to do for this is to copy the db-export.xml file to metadata/sql/sample-data.xml.

NOTES:

• For Oracle, you need to add a "schema" attribute to all the <dbunit> tasks in build.xml. You also need to do this for the "db-export" target for PostgreSQL.
• If you want to limit the tables exported (i.e. from a production database), simply nest a bunch of <table name="table_name"/> elements inside the <export> element.
• If you get errors about foreign key constraints when running "db-load" after "db-export" - you need to re-arrange the order of your tables in the imported XML file.
• To clear out tables before your tests, add an empty <table name="table_name"/> element to sample-data.xml.

How do I attach a profiler to Ant?

I'll admit, I have very little experience working with a profiler - but I think I need one. Someone e-mailed me about testing all of AppFuse on a super-beafy box, and he got OOM errors after 17 minutes. For a dual CPU, 2Ghz Opterons, with 2GB RAM running RHEL3 workstation, it only made it to the Spring/AppGen test, which is #8 of 21. On my PowerBook, it makes it to #12, but my Linux box only make it to #8 too. My guess is there's some sort of memory leak in one of the testing tools - Tomcat, Cargo, WebTest or AppFuse itself.

Anyone have experience attaching a profiler to their Ant build or testing process to look for memory leaks?

XmlHttpRequest

Dave quotes it, Charles writes it. XmlHttpRequest is the topic at hand and how it will help us build the next generation of web UIs. I've used Brent Ashley's JSRS Library to do some fancy UI work (one drop-down populates another) last year. It worked well in combination with Erik Hatcher's articles: Remote scripting using a servlet and Sending rich messages between client and server using asynchronous messaging. The project was AppFuse based, so I have the code if someone really wants it.

An example of XmlHttpRequest is in Roller itself - in the twisty comments you see on this site. For those who have used them, you probably know they're somewhat buggy. With all this talk of XmlHttpRequest, maybe it's high-time to revisit Roller's implemenentation and see if the technology has gotten any better. In reality, I know it hasn't - it's the browsers that are the problem and there hasn't been an update to IE in quite some time. My code could probably use some work though. If you want to dig in and check it out, here's the xmlextras.js that does the heavy lifting and comment-specific JavaScript.

After looking at this code this morning, it looks like there's different methods being used for the different browsers.

/////////////////////////////////////////////////////////////////////
//// XML Document loading

function loadXMLDocument(aURL, aCallback)
{ 
  gMediaCallback = aCallback;
  
  if (window.ActiveXObject) {
    // Internet Explorer XML loading syntax
    gMediaDoc = new ActiveXObject(getControlPrefix() + ".XmlDom");
    gMediaDoc.onreadystatechange = onMediaReadyStateChange;
    gMediaDoc.async = true;
    gMediaDoc.load(aURL);
  } else {
    // Mozilla XML loading syntax
    gMediaDoc = document.implementation.createDocument("", "", null);
	var xmlHttp = new XMLHttpRequest();
    xmlHttp.overrideMimeType("text/xml");
	xmlHttp.open("GET", aURL, false);
	xmlHttp.send(null);
    gMediaDoc.loadXML(xmlHttp.responseXML.xml);
    onMediaLoaded();
  }
}

I wonder if there's a common way that can be used for both browsers? BTW, 99% of the code for these comments was borrowed from Joe Hewitt.

Later: Another article covering this technology: Using the XML HTTP Request object. Hat tip to Carl.

Can you test all of AppFuse?

I'll admit, it's time for me to get a G5. I can no longer test everything in AppFuse in one fell swoop. When I try to run this Ant build file (which I'd like to use with CruiseControl) on my Mac and Linux machines, I get OutOfMemory errors. My PowerBook has ANT_OPTS set to "-Xmx768m" and my Fedora Core 3 box has it set to "-Xms1024M -Xmx1024M". Both machines have 1 GB of RAM. The build dies a lot sooner on Linux (15 minutes), and the PowerBook gets really close to finishing (42 minutes). I'm guessing all the tests would take about 50 minutes on the PowerBook. There are currently 21 AppFuse combinations tested by this script. Spring is used in all of these, so I've eliminated that as a listed option.

NOTE: If you're trying this on Windows, remove the "fixcrlf" call at the beginning of the "test" target.

1. Struts + Hibernate
2. Struts + Hibernate and iBATIS
3. Struts + iBATIS
4. Struts with AppGen - Generic
5. Struts with AppGen - Detailed
6. Spring MVC + Hibernate
7. Spring MVC + iBATIS
8. Spring MVC with AppGen - Generic
9. Spring MVC with AppGen - Detailed
10. WebWork + Hibernate
11. WebWork + iBATIS
12. WebWork with AppGen - Generic
13. WebWork with AppGen - Detailed
14. JSF + Hibernate
15. JSF + iBATIS
16. JSF with AppGen - Generic
17. JSF with AppGen - Detailed
18. Tapestry + Hibernate
19. Tapestry + iBATIS
20. Tapestry with AppGen - Generic
21. Tapestry with AppGen - Detailed

So, the question is - can your machine run all the tests for AppFuse? If so, let me know your specs. I'd love to get this setup for CruiseControl, but if I can't even run it with Ant, I doubt CruiseControl will be any better. I realize I could split things up, but I prefer to have one build file.

Pick the web framework you think is cool

Ever since I started adding additional web frameworks into AppFuse, people have asked me "which framework should I use?" I've often told them "use what you know." If you have in-house knowledge of Struts, use it. I thought this was good advice because I believed that existing knowledge leads to greater productivity.

Lately, I've started to change my philosophy. I'm starting to think it's more important to use the web framework you're passionate about. The one you want to learn more about. After reading Kathy Sierra's "Does it really matter if your tool is cool?", it seems this is a good idea. She writes:

Coolness (or just perceived coolness, it really doesn't matter) is linked to passion. The cooler you perceive your tools to be, the more passionate you are about those tools. And passion, while it might lead to the "everything is a nail" syndrome, has an extraordinary amount of value!

Obviously there's quality of life... a life with passion is certainly more fun than one without. And the more passion, the greater the chances that a person has what psychologists label optimal experiences. And the more optimal experiences one has, the more likely one is to describe life as being "happy". So, passion = optimal experiences = happiness. And research says happy people are generally more productive. Certainly they're more spirited and fun to be around...

So I guess passion leads to greater productivity, not existing knowledge. So which web framework do you think is cool? Which one are you passionate about?

If I had to choose based on my passionate choice, and the one that I think is the coolest, I'd have to go with Tapestry or possibly JSF (JSF would be a lot cooler if it let me put my JSPs in the WEB-INF directory instead of in the root). These are the frameworks I want to learn more about. 6 months from now? Maybe Laszlo or JDNC.

Speaking at MySQL Users Conference

Looks like I'll be speaking at the MySQL User Conference in April 2005. This conference is at the Santa Clara Convention center, where SD West was last year.

Congratulations! You have been accepted as a presenter for
the MySQL Users Conference 2005 at the Westin Santa Clara, Santa Clara,
California, April 18, 2005 - April 21, 2005.

The following has been accepted as a 3 hour tutorial class for the
event:

"Developing Test-Driven Web Applications With Spring and Hibernate"

The tutorial classes are scheduled for Monday, April 18, and we will
send the exact time schedule shortly.

They wanted a fancier title than all the AppFuse ones I had cooked up - that's why it's titled Developing Test-Driven Web Applications With Spring and Hibernate. Now I just need to figure out what kind of app to develop in 3 hours. With AppGen and AppFuse Generator, it takes a lot of fun out of the development process. Or maybe it puts the fun back in?

If there's a JUG nearby that'd like to know a bit more about AppFuse or Spring, let me know.