About Tomasz Nurkiewicz

Java EE developer, Scala enthusiast. Enjoying data analysis and visualization. Strongly believes in the power of testing and automation.

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Mapping enums done right with @Convert in JPA 2.1

If you ever worked with Java enums in JPA you are definitely aware of their limitations and traps. Using enum as a property of your @Entity is often very good choice, however JPA prior ...
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Null safety in Kotlin

Kotlin is a statically typed JVM language developed by Jetbrains. It has some good documentation so today I will focus on a tiny part of it – null safety.There are at least ...
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Lazy sequences implementation for Java 8

I just published LazySeq library on GitHub – result of my Java 8 experiments recently. I hope you will enjoy it. Even if you don’t find it very useful, it’s still ...
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Java 8: CompletableFuture in action

After thoroughly exploring CompletableFuture API in Java 8 we are prepared to write a simplistic web crawler. We solved similar problem already using ExecutorCompletionService, Guava ...
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Java 8: Definitive guide to CompletableFuture

Java 8 is coming so it’s time to study new features. While Java 7 and Java 6 were rather minor releases, version 8 will be a big step forward. Maybe even too big? Today I will ...
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Synchronising Multithreaded Integration Tests revisited

I recently stumbled upon an articleSynchronising Multithreaded Integration Tests on Captain Debug’s Blog. That post emphasizes the problem of designing integration tests involving ...
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Lazy sequences in Scala and Clojure

Lazy sequences (also known as streams) are an interesting functional data structure which you might have never heard of. Basically lazy sequence is a list that is not fully known/computed ...
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Scala traits implementation and interoperability. Part II: Traits linearization

This is a continuation of Scala traits implementation and interoperability. Part I: Basics. Dreadful diamond problem can be mitigated using Scala traits and a process called linearization. ...
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SiftingAppender: logging different threads to different log files

One novel feature of Logback is SiftingAppender (JavaDoc). In short it’s a proxy appender that creates one child appender per each unique value of a given runtime property. Typically ...
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WatchService combined with Akka actors

WatchService is a handy class that can notify you about any file system changes (create/update/delete of file) in a given set of directories. It is described nicely in the official ...
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