Category Archives: Tech Stuff

Flex on Grails, Take 2: Part 3

At the end of the second article in this series, we ended up with a working application but it was not really ready for the real world because it had one major flaw: the URL of the AMF endpoint was hardcoded in the client in such a way that it was impossible to change after compilation and very hard to handle several environments (dev, test, prod). The solution to that problem is to integrate dependency injection into the mix.

Now there are a lot of such frameworks for Flex/ActionScript applications, including Parsley, Swiz, Cairngorm, etc. But I’ve never been a big fan of those big MVC frameworks that impose their own interpretation of the MVC pattern and completely limit the initial capabilities of Flex itself. For me, the Flex framework itself is clean enough that you don’t need all that overhead and it’s better to use a non-intrusive framework like Spring ActionScript. So that’s what we are going to do.

Continue reading Flex on Grails, Take 2: Part 3

JVM Web Framework Survey, First Results

Yesterday at Devoxx, Matt Raible did a very interesting talk on comparing JVM web frameworks. On this occasion he had the incredible courage of voicing his opinion on each of the most well-known frameworks, rating them in a matrix and the craziest part: showing this matrix to everyone.

Immediately after his talk, Twitter was on fire with advocates of each of those frameworks complaining about how those ratings were unfair and biased. I mean of course, I can hardly talk about 3 or 4 of these frameworks with the same level of confidence, but the guy has enough experience to have played with at least 13 of them, and it’s perfectly normal to expect him to have up-to-date and accurate feedback about all of them.

Anyway, his talk was highly entertaining but in the end it inspired me 2 reflections:

  1. His list of 20 criteria is excellent and covers pretty much everything, except maybe for “graphics design integration” which I think is very important and some frameworks make it much easier than other, like Flex with Flash Catalyst for example. So even if you don’t agree with the ratings, you can still reuse his methodology, build 13 proof of concepts and rate them yourself.
  2. Rather than complaining, let’s do a survey.

So right after the talk, I built a small Google docs survey, and to this date I got 26 answers, which I think is far less than the number of complaints, but is already a good start. Here are the first results based on those 26 responses. As you can see, there was a small issue with Google Docs who didn’t correctly save the results for the last criterion, degree of risk. So the rankings are based on only 19 criteria so far. But if you still want to voice your opinion, you can still do it. I will update the results from time to time and this time, the 20th criterion should be considered.

Thanks again Matt Raible for this very inspiring talk, and thanks to all the Devoxx team for yet another memorable edition.

By the way, as far as I’m concerned, I’m pretty happy with Grails and Flex at the moment, but after the amazing demos I saw at Devoxx, I will probably have a deeper look at Vaadin very soon. And please Jetbrains, we need more visual designers (Flex? Vaadin?).

Flex on Grails: Take 2, Part 2

This is a follow-up post to Flex on Grails, Take 2.

Task creation

Now that we have a basic working application, let’s improve it by adding some security in there. If your Grails application is still running, you can leave it that way as you won’t need to restart your backend every time you modify it. That’s the whole beauty and productivity of Grails and this plugin.

Continue reading Flex on Grails: Take 2, Part 2

Flex on Grails: Take 2

A little bit of history

When I first discovered Flex, one of my first obsessions was how to make it work with a Java backend. I’m a java developer at heart and my Java backend stack of choice back then was Spring/Hibernate-based. That’s why I published a series of full-stack articles that became quite popular. But another obsession of mine has always been productivity so when I discovered Grails, it became my new preferred environment and I started looking for ways to plug a Flex frontend into a Grails backend. All of this work culminated in the release of my Grails BlazeDS plugin which worked great but had a few limitations (only Java DTO’s, run-war instead of run-app, etc.). I mean, it worked great… until it didn’t. For some obscure reason, my plugin didn’t work at all with Grails 1.3.x. I fought with this for months, but there were just too many technologies involved (Groovy, Grails, BlazeDS, Spring-Flex, Spring, etc.) and my knowledge of some of those technologies was too shallow to really understand everything happening under the hood. That’s why I called upon SpringSource and/or Adobe to help me or provide the community with a decent Flex support for Grails. And guess what! They listened. A couple of months ago, I got in touch with Burt Beckwith, from SpringSource, who intended to work on that. So he asked me for feedback and really that’s all I did: I explained to him some of the issues I had with the plugin, the typical environment that we Flex developers work with, etc. And today… TADAAAA! The new Flex support plugins are here.

Continue reading Flex on Grails: Take 2

Versioning is Just Too Complex

I’m currently trying to unlearn 10 years of CVCS and Subversion certainties to learn DVCS and Git. And although a lot of people see those as a huge leap forward, I can’t help thinking it’s still way too hard. Versioning is such a basic need, it shouldn’t require that much knowledge. Right now, whether it’s Subversion or Git (or Mercurial, or whatever), the problem is always the same for me: it’s just too low-level. Those systems are designed as if I needed to be a mechanic to drive my car. I don’t care about injectors, gearbox and all that stuff. All I want is to go faster or slower, turn left or right, and that’s about it. Now sure if I’m a mechanic, I can make my car perform much better, but if I just need to get from point A to point B, do you really think I will learn mechanics? Most people won’t. They will just walk there, or ride a bike. And that’s exactly what’s happening in too many companies: “manual versioning”, version numbers in file names, shared drives, even $harepoints, are just poor solutions to a real problem. We need versioning, but existing solutions have an unacceptable learning curve. They’re not smart enough, and they require us to be smart, even though that’s not our main purpose.

Even as a developer, sure I can understand such concepts, but I don’t want to learn what merge, pull, push, commit, branch or update mean. I want to start new projects, participate in existing projects, fix bugs, implement features, refactor my code. Whatever underlying system my company or team is using, whatever technologies I’m working with, my own workflow should not be influenced so much by the tools I use to keep track of my work and collaborate with my team. It should be transparent.

My point is: Git is a leap forward, but it’s a small one, and we need a giant one. We need a versioning system that implements workflows at a higher level, that abstracts away all those silly commands with similar names but different meanings. We need an abstraction layer that can work on top of existing lower-level tools like git, subversion and others, and that can be integrated seamlessly in development environments like IntelliJ Idea or Eclipse (sigh). Sure we will probably lose some power in the process, but we can leave it as an option.

In fact, we need to do with versioning what Maven has done to build lifecycle. Convention over configuration. What are the most common tasks we do on a daily basis:

  • start a new project
  • enter an existing project
  • start fixing a bug
  • start implementing a new feature
  • start refactoring some code
  • switch to another bugfix/feature/refactoring
  • complete a bugfix/feature/refactoring
  • share a bugfix/feature/refactoring with my team or with the world
  • what else?

And then let’s try to map those high-level tasks with lower-level command sequences. And let’s do it in such a way that I can easily change the underlying implementation, or reconfigure certain aspects of it. And why not add the possibility to define your own workflows for other things than traditional dev. In fact, to make things clearer, let’s just call git, subversion and other existing tools “versioning tools”, and let’s design a “collaboration framework”. Exactly like Maven is not a “build tool”, it’s a “build lifecycle framework”.

I’m just ranting out loud here, but what do you think?

Grails/BlazeDS/Flex/iPhone Full Stack Part 2/3

In the previous episode, we built a simple Grails backend for the todolist application. In this installment, we will create a simple Flex 4 front-end for this backend.

The following assumes that you have already installed Flash Builder 4 (formerly known as Flex Builder), either in standalone mode or as an Eclipse plug-in.

Continue reading Grails/BlazeDS/Flex/iPhone Full Stack Part 2/3

Grails/BlazeDS/Flex/iPhone Full Stack Part1/3

A couple of years ago, I published an article on this blog entitled “Flex, Spring and BlazeDS: the full stack!” and this article became very popular. Actually it broke my daily visits record. Today I’m gonna try to break this record again.

In the last couple of years, I’ve worked a lot with Flex and Spring. But in my eternal quest for productivity and user experience, I discovered Grails. Based on the same ideas as Ruby on Rails or Django, it combines a dynamic language – Groovy – with the power of “convention over configuration” to make it possible to create web applications in no time, thus allowing you to spend more time on your user experience.

Of course it’s not the only thing that has changed since then. Flex 4 is now finally out in the open. BlazeDS 4 too. And Flash Builder is finally productive enough for me to use it… in combination with IntelliJ IDEA of course.

All those evolutions in my toolset needed to be integrated, so I ended up building a Grails plugin to do just that: Grails BlazeDS plugin. And since this plugin could not be officially released without a proper demonstration, here we are.

I prepared this tutorial for a BeJUG talk I gave last week. So I want to thank Stephan Janssen and the BeJUG for inviting me… and for staying with me without throwing vegetables at me, given all the failures I had during the live coding session. For those of you who were there: I clearly identified PermGen space as the guilty part responsible for all these blank screens. In fact, since Grails migrated from Jetty to Tomcat as their runtime server, default java memory settings are not enough anymore, so I always configure my projects for that, but of course, in live, I forgot…

Anyway. I’m going to publish this tutorial in three episodes, each one of them being accompanied by its very own screencast on Vimeo (damn Youtube and their 10-minute limit!). But I’ll also publish the tutorial transcript right here for those who want to go faster.

Important note: this tutorial covers the following set of technologies in the specified versions:

In particular, it seems that Grails 1.3 that was just released a couple of days ago breaks Grails BlazeDS plugin. I’ll update both my plugin and this tutorial when I can make them all work together again.

Continue reading Grails/BlazeDS/Flex/iPhone Full Stack Part1/3