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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Simplifying trading system with Akka

My colleagues are developing a trading system that processes quite heavy stream of incoming transactions. Each transaction covers one Instrument (think bond or stock) and has some (now) ...
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InterruptedException and interrupting threads explained

If InterruptedException wasn’t checked exception, probably no one would even notice it – which would actually prevent couple of bugs throughout these years. But since it ...
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HashMap performance improvements in Java 8

HashMap<K, V> is fast, versatile and ubiquitous data structure in every Java program. First some basics. As you probably know, it uses hashCode() and equals() method of keys to ...
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Automated bug finding with git bisect and mvn test

Do you know the feeling when you discover a bug in a functionality that was working couple of weeks (or versions) ago? Too bad we didn’t have any automated tests and what used to ...
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Simplifying ReadWriteLock with Java 8 and lambdas

Considering legacy Java code, no matter where you look, Java 8 with lambda expressions can definitely improve quality and readability. Today let us look at ReadWriteLock and how we ...
spring-interview-questions-answers

Custom Spring namespaces made easier with JAXB

First of all, let me tell this out loud: Spring is no longer XML-heavy. As a matter of fact you can write Spring applications these days with minimal or no XML at all, using plenty ...
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Three flavours of request-response pattern in Akka

Imagine a simple Akka actor system consisting of two parties: MonitoringActor and NetworkActor. Whenever someone (client) sends CheckHealth to the former one it asks the latter by sending ...
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Turning Twitter4J into RxJava’s Observable

aTwitter4J is a Java wrapper around Twitter API. While Twitter supports simple request-response interactions in this article we will explore streaming APIs. In contrary to request-response ...
java-interview-questions-answers

Proxies done right with Guava’s AbstractInvocationHandler

Not too often but sometimes we are forced to write custom dynamic proxy class using java.lang.reflect.Proxy. There is really no magic in this mechanism and it’s worth knowing ...
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Playing with futures

During job interviews we often give Scala developers a simple design task: to model a binary tree. The simplest but not necessarily best implementation involves Option idiom:                 case ...
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