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Handsontable ‘Spreadsheet’ talking to SpringMVC

Handsontable is an Excel-like data grid utilizing JQuery. For example, it provides the ability to copy and paste directly to & from Excel. Handsontable itself if very easy to setup. The part I struggled with was passing the data to SpringMVC. So, this post shows how to send data from a Handsontable data grid on the client to a SpringMVC server.

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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 and the deployed app at http://springmvc.shaunabram.cloudbees.net.
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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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GitHub SSH key audit

Got this error recently when trying to do a fetch from github in Intellij:

fatal: The remote end hung up unexpectedly
ERROR: Hi sabram, it’s GitHub. We’re doing an SSH key audit.

Vague error but finally figured out that it is related to Github’s recent security compromise and that I needed to verify my SSH keys.

Couldn’t find much about the error on Google, so maybe this post will help someone else!

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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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JavaOne: Comparing Java Web Frameworks

The first talk I attended at this year’s JavaOne was “Choosing Your Java Web Framework” by Richard Pack from salesforce.com

Overall, I found this a really interesting talk. It was lacking in any sales pitch, nor did it have the unquestioning devotion to one particular framework that I felt some of the Java FX talks had. Instead it seemed like an unbiased look at web frameworks in general and a handful of frameworks in more detail, based on Richard’s extensive and hands on experience and SalesForce and Hyperic.
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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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Spring Enterprise Recipes

I recently found out that this book has just been published:
Spring Enterprise Recipes: A Problem-Solution Approach
It is written by Josh Long and Gary Mak. I have heard Josh speak at several conferences, followed his articles on TheServerSide (as well as on his blog) and recently got to hang out with him at the SoCal Code Camp. He is very knowledgeable about Spring and enterprise integration and since Gary is already an author of one of the leading Spring books (Spring recipes), this should be a great book. I have just ordered my copy and will try to post a review when I am done with it.

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