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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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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Three Reasons Why We Should Not Use Inheritance In Our Tests

When we write automated tests (either unit or integration tests) for our application, we should notice pretty soon thatMany test cases use the same configuration which creates duplicate ...
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Using jOOQ with Spring: CRUD

jOOQ is a library which helps us to get back 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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10 Books Every Java Developer Should Read

I have read my share of software development books and I have noticed that it is very rare to find a book which I want to read more than once. However, once in a while I find a book ...
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The Cost of Context Switching

I have always thought that I am good at multitasking. That is why I believed that I don’t have to pay the price associated with context switching (or task switching). This week I ...
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Domain-Driven Design Revisited

Recently I read a book titled Domain-Driven Design by Eric Evans. This wasn’t the first time I read this book but this time I realized that I had been totally wrong about domain-driven ...
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The Way of the Pro

Enterprise developers are serious professionals. They don’t waste their time for creating silly things. They leave this to the hipster developers. Enterprise developers write software ...
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The Microservice Architecture Sounds Like Service-Oriented Architecture

I didn’t understand the service-oriented architecture. I thought that it was just one of those highly theoretical and very impractical software architecture patterns. In other words, ...
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Adding Social Sign In to a Spring MVC Web Application: Integration Testing

I have written about the challenges of writing unit tests for applications which use Spring Social 1.1.0 and provided one solution for it. Although unit testing is valuable, it doesn’t ...
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