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Spring MVC Hello World with Continuous Deployment

Oh dear, yet another ‘Hello World!’. But although the functionality is trivial, this little SpringMVC project is complete enough for me to use as a template to bootstrap more complex projects. It consists of:

  • HTML/JSP client
  • SpringMVC server using a Controller/Service/DAO design
  • Maven for build and dependency management

This is an updated version of an older project I created, with the following enhancements:

  • Added a full suite of automated tests (unit, integration and browser based)
  • Added placeholders for JavaScript and images (both can be a little tricky to put in the correct place with SpringMVC)
  • Incorporated into a continuous deployment environment

More details below, but you can find the full source code on this GitHub repository

(Previously I had the code deployed on a CloudBees instance at http://springmvc.shaunabram.cloudbees.net, but CloudBees have since unfortunately shut down their free tier).

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Running Jenkins jobs sequentially

I am a huge fan of the Jenkins continuous integration tool, using it not just for continuous integration, but also continuous delivery, server monitoring and performance testing.

Although using Jenkins is normally a breeze, I recently had a need to run several Jenkins jobs sequentially and it proved a little trickier than expected, so I thought worth posting about.

Basically, I wanted to call a database backup job before calling the deploy build job, which obviously shouldn’t be done in parallel. After a bit of research, I found a number of ways to have Jenkins run jobs sequentially.
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First experiment with Cloud Foundry

I’m at a Cloud Foundry conference today. Cloud Foundry is an open source “cloud” platform as a service (PaaS).

I decided to dive in and try to deploy the server we developed at GiveCamp last week for the ‘Big Brothers and Big Sisters’ charity project. I started by mavenizing the project, so I had a war to deploy.

Then, I created a free Cloud Foundry account, installed their ‘vmc’ command line tool and ran the ‘vmc push’ command to deploy my way to the cloud. And it worked straight off! Don’t you just love it when tools just work?

Our webservice is now running on a remote server that can be accessed by the iPhone and Android apps the team is developing. We still have some database work to complete, but this feels like a nice step forward.

In the mean time, I am now officially a Cloud Foundry fan…

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Central California GiveCamp Review

Had a great weekend at the Central California GiveCamp in Fresno this weekend. I joined the Big Brothers and Big Sisters team, working on a mobile app (Android & iPhone). I helped out on the server & database side where we created a Java WebService talking JSON, with a MySQL database. Most of the team were from Fresno State. Still some work do to deploying the solution to the cloud, but we made good progress.

It was a really enjoyable weekend, and all for a good cause. Thanks to Walt Read and Iran Rodrigues for setting up and running it all so smoothly, and Dr Alex Liu from Fresno State for organizing the team…

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Going to Central California GiveCamp

Heading to Central California GiveCamp tomorrow for a weekend of coding for charitable causes. Should be fun!

Swing, Webstart and Maven – An Example

Following my introductory rant on the subject, this post is a working example of using Swing and Webstart with a multi-module maven project.

Complete source can be downloaded from here.
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Swing, Webstart, Maven – a difficult combination

I have spent the last few weeks struggling with a Swing app that I wanted to deploy via Webstart and build using Maven, via the the Webstart Maven Plugin. It has been a hugely painful process. I found the plugin documentation difficult to follow, struggled to understand the subtle config differences in jnlp, took longer than I expected to get jar signing working, had problems with webstart caching and suffered through a plethora of vague error messages. I found this posting where the author vowed to never use Webstart again, and I can empathize. Postings of people asking for help with Webstart problems certainly aren’t difficult to find. Using maven to build the jnlp provides some conveniences, but introduces new problems too. Overall, I’d prefer to avoid using a Swing/Webstart/Maven solution again.
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Spring MVC Hello World

There is a good Getting Started with Spring MVC blog post over on the Spring team blog.

I have created several Spring MVC projects for both work and play, and am attaching my own simple version of the HelloWorld example here, based on the Spring blog example.
Find my maven ready source here.
Like my previous JSP/Servlet example, I find these templates useful for getting prototypes up and running.

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SLF4J & Logback is the new commons-logging & log4j

Interesting post on which logging framework to choose from the logging mess.

I still default to log4j, but it sounds like logback (as the new alternative to log4j), wrapped by SLF4J (as the new alternative to commons logging) is the way forward. Both are written by Ceki Gülcü (blog), the original log4j author.

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Setting up multiple instances of Tomcat

With multiple tomcat instances, each can run in its own JVM, have its own configuration and can be started/stopped independently.

One approach to doing this would be to have multiple, full tomcat installations. This article instead details how to install tomcat once (in CATALINA_HOME) but have multiple independent instances (by utilizing CATALINA_BASE). This is a more streamlined approach that makes creating multiple instances easier and also simplifies upgrades/rollbacks of tomcat.

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