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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Three Reasons Why Human Skills Are Important for Software Developers

It is easy to think that being a good software developer requires only technical skills. After all, software developers spend a majority of their time designing software and writing ...
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Using jOOQ with Spring: Code Generation

As we might remember from the first part of this tutorial, jOOQ states that jOOQ generates Java code from your database and lets you build typesafe SQL queries through its fluent API. The ...
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FindBugs Maven Plugin Tutorial

FindBugs is a static code analysis tool which identifies problems found from Java code. We can integrate FindBugs into our build process by using the FindBugs Maven plugin. This blog ...
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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 ...
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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 ...
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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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