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Ahoy There Callbacks!

Because it’s my bag, I like JavaScript. In fact, I’ve grown to love JavaScritp’s asynchronous callback oriented style of programming. Consequently, when I find myself in a non-JavaScript ...
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Tomcat’s Graceful Shutdown with Daemons and Shutdown Hooks

My last couple of blogs have talked about long polling and Spring’s DeferredResult technique and to demonstrate these concepts I’ve shoehorned the code from my Producer ...
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Fine-Grained Concurrency with the Guava Striped Class

This post is going to cover how to use the Striped class from Guava to achieve finer-grained concurrency. The ConcurrentHashMap uses a striped locked approach to increase concurrency ...
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How To Write Your Own Java / Scala Debugger

With this post we’ll explore how Java / Scala debuggers are written and work. Native debuggers such WinDbg for Windows or gdb for Linux/Unix get their power from hooks provided to ...
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My Favorite Books for Advanced Java Developers

The idea for my last blog post (my ten favorite online resources for advanced Java developers), was inspired by the Xiaoran Wang post Top 10 Websites for Advanced Level Java Developers. ...
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How to kill Java with a Regular Expression

We recently stumbled upon a phenomen we absolutely weren’t aware of: You can kill any Java IDE and also any Java process with a simple regular expression… Back in university, ...
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How to Speed Up Apache Xalan’s XPath Processor by Factor 10x

There has been a bit of an awkward bug in Apache Xalan for a while now, and that bug is XALANJ-2540. The effect of this bug is that an internal SPI configuration file is loaded by Xalan thousands ...
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Six Java features to stay away from

I have spent countless hours troubleshooting different applications. Via the experience I can draw a conclusion about several Java SE features/APIs which most of the developers should ...
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Java Reflection Tutorial

In this tutorial, I mainly write some examples to introduce what Java reflection can do. Hopefully, it can give you an overview of this concept. Please leave your comment for suggestions. What ...
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Simplicity vs. Robustness – Demonstrated On Lock File Handling

Today we will discuss a conflict between the design values of keeping things simple, stupid (KISS) and robustness, between underdesign and overdesign. We were writing a batch Java application ...
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