Skip to main content

Vaadin meetup

I attended Vaadin meetup with a few colleagues on a way to JFokus 2013 and thought I should share my notes of the two. First post is about vaadin meetup that took place on a cruise from Turku to Stockholm.

I made notes of three presentations and one of them I had high expectations. There were also two other presentations that I didn't make any notes of.

Vaadin 7


Vaadin released Vaadin 7 framework the same day that the meetup was on so they had a presentation where they told about new features and future plans. I'm more of a backend programmer than UI programmer so my notes of this were pretty brief but here it goes.

Whats new

  • Servlets and HTTP-sessions are controllable by the programmer
  • Multiple UI classes
    • e.g. One for web browsers and one for mobile web browsers
  • GWT is now build-in
  • Support for external JavaScript modules

What to expect in the future

  • Faster relase cycles
    • maintenance release every two weeks
  • Dynamic CSS injection
  • Vaadin CDI, their own depency injection system
  • Vaadin charts, for drawing nice charts

ePalo


This was a project ordered by Helsinki university and it was developed by a company called Arcusys. It's some sort of feedback system. The interesting part of this presentation was why they chose Vaadin framework for the UI. They chose it because it could programmed with Java or Scala and the developers didn't need to have any knowledge of web technologies like HTML, CSS or JavaScript.

Modern software development anti-patterns


Martijn Verburg, Diabolocal developer, had a presentation of software development anti-patterns. This the presentation that I really wanted hear he also had the same presentation later at JFokus. I had high hopes for this presentation and it didn't let me down. I'm just going to write a few buzzwords and notes here and the rest is available on Martijns slides and video filmed at the meetup.
  • Mortage-driven development
    • Write code to pay your mortage and make sure anyone else can't understand your code
  • Distracted by shine
    • Always use the latest and greatest
  • The deity
    • Huge classes e.g. Java class with 140k lines
Those were anti-patterns but he also gave tips how to avoid anti-patterns. 

One of the things he said is something in my opinion every developer should understand and remember. The anti-pattern was CV++ meaning that you try all the new frameworks and tools just so you can put a new line in your CV when instead you should be good at the principles.

So what does that mean. It means know the principles of software developent because languages, frameworks and tools change and evolve all the time but if you know hte principles you can always learn a new language or learn howto use a framework you haven't used before.

All the presentations of Vaadin meetup were filmed and uploaded to youtube. Links can be found at Vaadin meetup website https://vaadin.com/meetup/jfokus-2013.

On the next two posts I'll be what I learned in JFokus 2013.

Comments

Popular posts from this blog

Simple code: Immutability

Immutability is a special thing that in my mind deserves a short explanation and praise. If you're familiar with functional programming you surely recognice the concept of immutability because it's a key ingredient of the paradigm. In the world of object oriented programming it's not as used and as easy to use approach but there are ways to incorporate immutability to parts of the code and I strongly suggest you to do so. Quick intro to immutablity The basic idea of immutability is unchangeable data.  Lets take a example. We have a need to modify a object's property but because the object is immutable we can't just change value but instead we make a copy of the object and while making the copy we provide the new value for the copy. In code it looks something like this. val pencil = Product(name = "Pencil", category = "Office supply") val blackMarker = pencil.copy(name = "Black marker") The same idea can be applied in functions and metho

Simple code: Readability

Readability, understandability, two key incredients of great code. Easier said than done, right? What one person finds easy to read and understand another one finds incomprehensible. This is especially true when programmers have different levels of understanding on various subjects e.g. object oriented vs. functional or Node.js vs. Java. Even though there are obvious differences between paradigms and programming ecosystems there are some common conventions and ways to lower the barrier. Different approaches It's natural that in programming things happen sequentally e.g. you can have a list of objects and you need to do various things to the list like filter some values out and count a sum of the remaining objects based on some property. With the given list const stories = [   {name: "authentication", points: 43},   {name: "profile page", points: 11},   {name: "shopping cart", points: 24},   {name: "shopping history", points: 15},   {name: &qu

Simple code: Unit tests

Unit tests are the developers number one safety net. Let that sink in. This is the number one reason for writing unit tests. Unit tests are written by developers for developers to ensure that the code works as expected and handles happy and sad paths correctly. With enough unit test coverage the tests enable a safe environment for refactoring and rewriting code. Unit test scope Unit test should test a single thing, a method or function call and it should test only one use case within. In other words a unit test should test a function with a single input. This is a important guideline to understand. When a unit test tests a function with single input it makes the test isolated, repeatable and predictable. Example of good tests: @Test fun findsAddress() {   val address = findAddress("Stevens street 35", "Southport", "Australia")   assertThat(address).isNotNull() } @Test fun doesNotFindAddress() {   val address = findAddress("Stevens street 697", &q