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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Getting Started with Gradle: Dependency Management

It is challenging, if not impossible, to create real life applications which don’t have any external dependencies. That is why dependency management is a vital part of every software ...
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Getting Started with Gradle: Our First Java Project

This blog post describes how we can compile and package a simple Java project by using Gradle. Our Java project has only one requirement: Our build script must create an executable ...
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Getting Started with Gradle: Introduction

Gradle is a build tool which replaces XML based build scripts with an internal DSL which is based on Groovy programming language. It has gained a lot of traction recently and that is ...
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Writing Clean Tests – Divide and Conquer

A good unit test should fail for only one reason. This means that a proper unit test tests only one logical concept. If we want to write clean tests, we have to identify those logical ...
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Writing Clean Tests – Replace Assertions with a Domain-Specific Language

It is pretty hard to figure out a good definition for clean code because everyone of us has our own definition for the word clean. However, there is one definition which seems to be ...
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Writing Clean Tests – New Considered Harmful

It is pretty hard to figure out a good definition for clean code because everyone of us has our own definition for the word clean. However, there is one definition which seems to be ...
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Writing Clean Tests – Beware of Magic

It is pretty hard to figure out a good definition for clean code because everyone of us has our own definition for the word clean. However, there is one definition which seems to be ...
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Writing Clean Tests – Naming Matters

It is pretty hard to figure out a good definition for clean code because everyone of us has our own definition for the word clean. However, there is one definition which seems to be ...
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Writing Clean Tests – It Starts from the Configuration

It is pretty hard to figure out a good definition for clean code because everyone of us has our own definition for the word clean. However, there is one definition which seems to be ...
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Using jOOQ with Spring: Sorting and Pagination

JOOQ is a library which helps us to get in control of our SQL. It can generate code from our database and lets us build typesafe database queries by using its fluent API. The earlier ...
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