Core Java
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Composing Java annotations
The allowed attribute types of a Java annotations are deliberately very restrictive, however some clean composite annotation types are possible…
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Wordcounter, Counting Words in Java with Lambdas and Fork/Join
These days I released Wordcounter, a Java library and command-line utility for counting words in text files and performing analysis…
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Java Management Extensions
What is JMX? The Java Management Extensions (JMX) is an API used for managing or monitoring various resources such as…
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Who is stealing your memory? The Application Servers Edition
You create an amazing app. You put it into production. And you notice that you justdo not have enough memory…
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Guava Splitter vs StringUtils
So I recently wrote a post about good old reliable Apache Commons StringUtils, which provoked a couple of comments, one…
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Google Guava BloomFilter
When the Guava project released version 11.0, one of the new additions was the BloomFilter class. A BloomFilter is a…
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Busting PermGen Myths
In my latest post I explained the reasons that can cause the java.lang.OutOfMemoryError: PermGen space crashes. Now it is time…
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What is a PermGen leak?
What follows is a practical introduction to a specific type of memory problems in Java applications. Namely – we will…
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Using Cryptography in Java Applications
This post describes how to use the Java Cryptography Architecture (JCA) that allows you to use cryptographic services in your…
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