Yassal Sundman

Yassal Sundman

Team coach and full stack developer.

Agile Software Development Slides

I gave a talk to a group of mechatronics students at KTH (Royal Institute of Technology) today. The topic was agile software development with an emphasis on Scrum, and some information about Kanban and Lean Startup. Here are the slides:


Mobile First Responsive Design Seminar

Thanks to everyone who attended the Mobile First Responsive Design Seminar.

If you’re curious about mobile first responsive design, here’s the presentation http://www.yds.se/mobile-first-responsive/:

The “slides” (a mobile first responsive site) are also available on GitHub: https://github.com/crispab/mobile-first-responsive

Tools used to create the presentation: ArtRage and Wacom Intuos, the same tools Henrik Kniberg used for the Product Ownership in a Nutshell video.

Twitter Bootstrap: Easy to Use

Are you building a Lean Startup, and want fast results? Twitter Bootstrap could be the solution you’re looking for. Are you a “backend” programmer who would love to have a beautiful site, but you “don’t know frontend”? Twitter Bootstrap could be the solution you’re looking for. Are you just looking for a simple frontend that works? Twitter Bootstrap could be the solution you’re looking for. Nice rounded corners, customizable colors, margins that look good, padding that’s right, JavaScript that just works: that’s what Twitter Bootstrap offers.
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From Jira to Trello

For the past couple of years I’ve had to work with Jira. Really, it’s mostly been dreading working with Jira. At both projects I’ve had Greenhopper available, and that hasn’t really made things better. My frustrations have had to do with the complexity of setting up the right fields, to creating a new sprint to creating a new project, down to mundane things like problems with ranking. I don’t particularly enjoy spending hours just tidying up my data. I want to quickly organize so I have time to actually work. I also want to easily see how much work we’ve done, and how much we have to do. Cards and a physical board are great for this, but I end up with stacks of cards everywhere, and after several sprints I don’t know what to do with them anymore. Enter Trello! read more »

Backbone: Orderly JavaScript

Backbones aren’t the usual fare for tech blogs, but if you’ve been following frontend development, then you’ll have heard of Backbone.js. From their site: Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions,views with declarative event handling, and connects it all to your existing API over a RESTful JSON interface. read more »

Context Appropriate Performance Testing at Let’s Test

The Let’s Test conference (“A European conference on context-driven testing – for testers, by testers”) kicked off today in Sweden. I know, I’m not a tester, so why was I at the conference? Certainly it wasn’t the “context-driven” that drew me, since before I heard of the conference I didn’t really know what that was. The “for testers, by testers” wasn’t so inviting to me as a developer, even though as a member of an agile team I write unit and regression tests, and participate in functional and exploratory testing.

It was actually Scott Barber’s tutorial description that got me to sign up: read more »

Impress.js – Great Presentations!

I’ve been playing around with a cool presentation tool, Impress.js by Bartek Szopka.

All you need is an editor, some HTML5 and CSS3 know-how and you’re up and running:

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Mercurial: hate it, or love it?

Mercurial is my first serious foray into distributed version control systems (dvcs). When I started gathering my notes for this entry I knew that this would be a really negative review of Mercurial. The first version control system I actually liked was Perforce. Several years later I encountered Subversion, it took a while to adjust but eventually I grew really fond of it. For the past 3 months, I’ve been using Mercurial… definitely not impressed. Or so I thought, but as I looked through my cons, I saw pros all over the place. So here are my [not-so-negative-after-all] thoughts on using Mercurial!

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Great Retrospectives

Great retrospectives are amazing, they have a way of really getting a team to work together and to energize them ahead of a new challenge. But even a great retrospective becomes boring and routine after a while. Luckily, there are a lot of us at Crisp working with different teams, so we got together this evening for a peer to peer exchange about retrospectives. We each got to pitch retrospective exercises and games that we’d like to try, or that we wanted to share. We ended up discussing and trying out 9 of them. Here’s a summary  in case you’d like to try some of them out at your next retrospective!

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Properties of a good daily stand-up

I had a conversation with some of my colleagues about what makes a good daily stand-up, here are some properties:

  • Time-boxed (15 minutes)
  • Everyone is engaged
  • Synchronization is taking place
  • Attention to problems
  • People ask for help
  • The conversation is about stuff that matters to most people, individual issues are postponed
  • Anyone can lead the meeting, not just the Scrum Master / Team Coach
  • The meeting is the starting point for the day, afterwards everyone feels energized and can start working right away
  • Ends with a punch that marks the end of the meeting and the start of the day*

* The team has dumbells by the scrum board. The rule is that if you feel the current speaker is monopolizing the meeting, you can hand the speaker a dumbell. Now the speaker can keep talking only as long as they can hold up the dumbbell with an outstretched arm.

Securing Your Website – SSL a how-to guide

I attended the Optimera STHLM conference this spring where SSL was a recurring theme. The speakers convincingly argued for more extensive use of SSL in websites. Consider that without SSL anyone can see what you read online, what you look at and what your interests are… I was pretty confident after the conference about setting up a website with SSL, and I got the chance to test it out soon after. In the process I discovered that sometimes it’s a bit tough to find information when you have a problem with the implementation, or when you want to learn more. So here’s a how-to guide with what I learned and links to the resources I used most. Maybe it’ll help you, and hopefully you can give me some feedback 🙂

So let’s get started!
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Our New Blog – A Groovy Journey

After several years of running our blog on Pebble we’ve made the move to WordPress, and it’s pretty exciting! But how did we get here? It turns out that migrating a blog from an unsupported platform is not very difficult, all you need is a bit of programming know-how and in a couple of hours you’ll be migrated!

Pebble stores all of its data in XML files on the server, WordPress data can be imported from WordPress eXtended RSS format. XML to XML pretty straightforward, you just need to pick a language! I figured I would try out Groovy since it seemed to offer some nice api’s for processing and producing XML.
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Coffee Break

You may remember Mats Henricson’s blog entry about what we know at Crisp. Well now we’ve put that same tag cloud (with some minor changes) on a mug!

I’m sure you’ll be seeing these mugs in the hands of a Crisper near you in the coming weeks, but here’s a sneak peek:

Ranking in Jira

I’ll just start out by saying that I’m no Jira expert, in fact I don’t even have Jira admin privileges at my current project. I do however use Jira at least once a day. I manage versions, and create components. I also create stories and epics, and try to maintain sprint and product backlogs in Jira. My project also uses Greenhopper.

My problem today? Greenhopper stopped ranking my stories! Or rather started randomly ranking my stories! In the Greenhopper planning board view, every time I edited a story or epic and saved my changes, my backlog would get re-ordered. It didn’t take long before my whole backlog was scrambled, the more I tried to fix the ordering the worse it got.

If this happens to you, do not try to fix the ordering! Stop making changes, and… “Optimize(repair)”  your ranking field!? Yeah, that’s right, you need to fix the ranking field every once in a while. You’ll find this “great” feature under Tools -> Configuration, under General find the Ranking Field section. Here you’ll find the Optimize(repair)link, just click and wait… and wait… and wait… and then your ranking problems will be solved.

Unfortunately, you’ll still have to come into the office tomorrow and somehow get your product backlog back in the right order, because it’s still scrambled.

No solution is perfect, but sometimes it feels like Greenhopper is a just way too far from perfect.

nb the version of Jira we’re using is v4.0.2#472 and Greenhopper v4.3

Working with large XML files

I recently ran up against a large XML file and legacy code that manipulated it.. the code had mysteriously stopped working, there were no unit tests and the XML file was large and had no line breaks. What do you do in this situation?

Loading the 30MB file in any kind of editor made the editor slow. Trying to format the file left the editors unresponsive. There’s no point in doing a grep find on a one line XML file, and while writing a cleanup script to add line breaks makes life better, why reinvent the wheel? Googling yielded several windows programs at first, but digging further, and using social networking finally produced two fantastic products for unix/linux based OS!

The first and easiest tool to use turns out to be xmllint! It’s most likely available with your unix/linux distribution just type it at the command prompt. Running xmllint –format my_file.xml > my_file_formated.xml will add line breaks where they make sense in your XML file. Now you can easily perform a grep find, you’re halfway there!

This perl program was the icing on the cake! You can download it here: http://search.cpan.org/dist/XML-Twig/ and then all you need to do is install it using the provided Makefile and you’re up and running. How did this help? Well among the hundreds of options provided with XML-Twig there’s a tool called xml_split. Just type xml_split my_file.xml and it will split your large unreadable file into manageable smaller ones. You can find more information about the usage here: http://search.cpan.org/dist/XML-Twig/tools/xml_split/xml_split

With just these two tools it’s easy to write unit tests against smaller sections of the XML file. It’s also easy to find the problematic sections in the XML file and easier to make changes and to test the fix!

What tools do you use?

Forget about java.util.Date, it’s Joda-Time!

Once upon a time all we had was java.util.Date and it was not good… then Sun introduced java.util.Calendar, and it got worse! How often do you sit at your keyboard and wonder how you can avoid writing date manipulation code just because you hate to look at the resulting mess? Maybe your project uses service or utility classes to hide the ugliness, but you know it’s still there. Well, stop hiding, there’s something better: Joda-Time!

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If you’ve read Michael Feathers’ book, Working Effectively with Legacy Code, you’ll know that he presents his techniques for refactoring clearly and simply. My favorite is his metaphor of finding the “seams” in the code to break it apart then “sew” it back together again. If you’ve attempted to implement some of these techniques in your own project you’ll also know that it’s not easy. It is slow arduous work, and when there are no unit tests it can be scary.

Crisp hosted Michael Feathers’ course:”TDD and Refactoring Techniques” this week in Stockholm. I hoped that some secret knowledge of how to refactor easily would be revealed, something that was just too elusive to express in a book. Instead my experience that refactoring is difficult was reaffirmed.

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