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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spring-interview-questions-answers

Spring from the Trenches: Invoking a Secured Method from a Scheduled Job

Let’s assume that we have implemented a Spring powered application, and secured it by using the method security expressions of Spring Security. Our next task is to implement a scheduled ...
spring-interview-questions-answers

Using jOOQ with Spring: Configuration

I have had my share of performance problems caused by ORMs. Although I have to admit that most of these problems were really caused by yours truly, I have started to think that using ...
agile-logo

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 ...
software-development-2-logo

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 ...
software-development-2-logo

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. ...
spring-interview-questions-answers

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 ...
software-development-2-logo

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 ...
spring-interview-questions-answers

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 ...
spring-interview-questions-answers

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 ...
software-development-2-logo

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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