About Petri Kainulainen

Petri is passionate about software development and continuous improvement. He is specialized in software development with the Spring Framework and is the author of Spring Data book.

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From Idea to Code: The Lifecycle of Agile Specifications

We have just started a new project to a customer who sells widgets. This customer is the leading widget provider of the whole world so the project can either make or break us. The project ...
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How to Start a Software Project as Fast as Possible

We started a new project last week, and I started to wonder what are the most important things to do if we want to get a project started as fast as possible (without messing it up). I ...
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Why Continuous Improvement Is Worth It?

When we start a new software project, we are typically full of enthusiasm. The whole team thinks that this time we will be able to avoid the mistakes we made in our previous projects. ...
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Adding Social Sign In to a Spring MVC Web Application: Unit Testing

Spring Social 1.0 has a spring-social-test module which provides support for testing Connect implementations and API bindings. This module was removed from Spring Social 1.1.0, and ...
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Turning Assertions Into a Domain-Specific Language

Assertions are an essential part of our unit tests. And yet, it so easy to neglect them. That is a shame because if we overlook the importance of assertions, the assert section of our ...
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Adding Social Sign In to a Spring MVC Web Application: Registration and Login

The first part of this tutorial described how we can configure Spring Social 1.1.0 and Spring Security 3.2.0 but it left two very important questions unanswered. These questions are:How ...
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Adding Social Sign In to a Spring MVC Web Application: Configuration

In the good old days users logged in by using the combination of username and password. Although nowadays some people still prefer the traditional way, a growing number of users want ...
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From Top to Bottom – TDD for Web Applications

I am a “testing fanatic” but I don’t understand test-driven development. Or so I thought. I have read a few books and numerous blog posts about it, and all of them have one major ...
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Creating Code Coverage Reports for Unit And Integration Tests with The JaCoCo Maven Plugin

When I started using Java 7, I noticed right away that the Cobertura Maven plugin doesn’t support it. This was a huge problem to me because I used code coverage reports every day. ...
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The Dark Side of Best Practices

Best practices are the backbone of software development (or so we are told). Every developer has his own opinions about software development processes, architecture, and programming. These ...
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