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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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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String memory internals

This article is based on my answer on StackOverflow. I am trying to explain how String class stores the texts, how interning and constant pool works. The main ...
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ServletRequest startAsync() limited usefulness

Some time ago I came across What’s the purpose of AsyncContext.start(…) in Servlet 3.0? question. Quoting the Javadoc of aforementioned method:...
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Spring Integration with reCAPTCHA

Sometimes we just need CAPTCHA, that’s a sad fact. Today we will learn how to integrate with reCAPTCHA. Because the topic itself isn’t particularly interesting and advanced, ...
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Quartz scheduler misfire instructions explained

Sometimes Quartz is not capable of running your job at the time when you desired. There are three reasons for that:all worker threads were busy running other jobs (probably with ...
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Quartz scheduler plugins – hidden treasure

Although briefly described in the official documentation, I believe Quartz plugins aren’t known enough, looking at how useful they are. Essentially plugins in Quartz are convenient ...
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Configuring Quartz with JDBCJobStore in Spring

I am starting a little series about Quartz scheduler internals, tips and tricks, this is a chapter 0 – how to configure persistent job store. In Quartz you essentially have a ...
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