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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Remote actors – discovering Akka

Assume our test application became a huge success and slowly a single server is not capable of handling growing traffic. We are faced with two choices: replacing our server with a better ...
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become/unbecome – discovering Akka

Sometimes our actor needs to react differently based on its internal state. Typically receiving some specific message causes the state transition which, in turns, changes the way subsequent ...
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Request and response – discovering Akka

In the previous part we implemented our first actor and sent message to it. Unfortunately actor was incapable of returning any result of processing this message, which rendered him ...
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Your first message – discovering Akka

Akka is a platform (framework?) inspired by Erlang, promising easier development of scalable, multi-threaded and safe applications. While in most of the popular languages concurrency ...
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Java features applicability

Java language and standard library is powerful, but with great power comes great responsibility. After seeing a lot of user code misusing or abusing rare Java features on one hand ...
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Java Coding Conventions considered harmful

There is an official Code Conventions for the Java Programming Language guide published on Oracle site. You would expect this 20+ pages document to be the most complete, comprehensive ...
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Testing Quartz Cron expressions

Declaring complex Cron expressions is still giving me some headaches, especially when some more advanced constructs are used. After all, can you tell when the following trigger will ...
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Where do the stack traces come from?

I believe that reading and understanding stack traces is an essential skill every programmer should posses in order to effectively troubleshoot problems with every JVM language (see ...
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RateLimiter – discovering Google Guava

RateLimiter class was recently added to Guava libraries (since 13.0) and it is already among my favourite tools. Have a look what the JavaDoc says: Let’s start from ...
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Which Java thread consumes my CPU?

What do you do when your Java application consumes 100% of the CPU? Turns out you can easily find the problematic thread(s) using built-in UNIX and JDK tools. No profilers or agents ...
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