Accessing the ServletContext in Tapestry 4.1

We use Tapestry 4.1 at my new gig, so I decided to implement my sandbox webapp with it to improve my understanding; this process has helped me immensely.

In this webapp I have a gallery that is built dynamically based on a listing of files from a directory within the app context. It was a bit of a struggle to figure out how to get access to the servlet context, but it's incredibly easy once you know the incantation.

Converting from Subversion to Mercurial on Bitbucket

I've been doing source control of personal projects on my own Subversion server for several years, but lately I've gotten interested in making some of it available so that perspective employers can see examples of my work. To do that, I setup a Stack Overflow Careers profile which acts as a resume with links to my StackExchange network profiles and projects on any of the major cloud-based source control services.

Bitbucket, hosted by Atlassian, provides free hosting for any number of repos, private or public, provided you stick to 5 or fewer total committers. It supports Git and Mercurial, probably the two most popular DVCSs today, and since I had some previous experience with Mercurial and use it every day at my current job, I opted for that.

Defining custom EL functions

I've been working on porting my sandbox webapp to Spring WebMVC, and in the process I've been learning more about JSP as well. This work led me to ask a question at StackOverflow, a favorite site of mine for a while for finding solutions to problems, though I've only recently begun participating.
In the question I asked about the best way to sort a single List in different ways in JSP, and I didn't get any answers that I really liked, so I kept looking and found an answer that I was able to use to suit my needs. You can see my solution at StackOverflow, but I'll reproduce it here as well.

Forwarding traffic from Apache2 to Tomcat on Ubuntu

I have several Java webapps running under Tomcat that I wanted to be accessible through Apache2 running on port 80 on my home server. It turns out that it's pretty easy to do, though I didn't find an example anywhere that included all the steps I needed to take to get it working. Most of what I need to know was at this blog post.

First of all, here are the exact versions I'm running. I wouldn't be surprised if there are newer major versions; I need to upgrade the server.

• Apache2: 2.2.11
• Tomcat: 6.0.18

We're going to proxy traffic back and forth between Apache2 and Tomcat using Apache JServ Protocol. Apache ships with support through the module proxy_ajp, and Tomcat has a built-in connector.

CruiseControl with Maven2 & SVN on Ubuntu

CruiseControl is a great tool to automate builds; I use SVN and Maven2, so these are the steps I took to get it working. Anywhere you see HOSTNAME, replace it with the hostname of the machine on which CruiseControl is running; anywhere you see PROJECT1, replace it with the name of a Maven2 project.

1. Download the binary distribution from the CruiseControl download page.
2. Extract it to /opt. This creates the install directory, /opt/cruisecontrol-VERSION, which I'll call INSTALL.
3. Add a new user under which CruiseControl will be run; pick whatever username you want, and keep it in mind.
   

   sudo adduser ccmaster

GWT with RPCs on Tomcat 6

The Tomcat Security Manager has bitten me again.
I'm liking GWT development with the Eclipse plugin. I ran through the StockWatcher tutorial, added RPCs and it was working great in hosted mode, but when I deployed it on Tomcat 6 on Ubuntu 9.04, RPCs failed with the following:

The call failed on the server; see server log for details

New GWT Projects in Eclipse

I had a bit of trouble getting a GWT project setup in Eclipse so that I could use a generated Ant build.xml for creating war packages but also utilize the fancy GWT Eclipse plugin features. The New Web Application Project wizard sets up the GWT project and creates some handy starter app code, but there's no option within the Google context menu to simply create a war. You can deploy directly to Google App Engine which is pretty cool, but I prefer to be able to deploy and run my webapps from my own server so that I know they can be deployed on any Tomcat installation.