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Weak, Weaker, Weakest, Harnessing The Garbage Collector With Specialist References

When and when not to use specialist references in Java Weak, Soft and Phantom references are dangerous and powerful. If they are used the wrong way they can destroy JVM performance; ...
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Using Apache Commons Functor functional interfaces with Java 8 lambdas

Apache Commons Functor (hereon [functor]) is an Apache Commons component that provides a functional programming API and several patterns implemented (visitor, generator, aggregator, ...
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Ensuring the order of execution for tasks

Sometimes it is necessary to impose certain order on the tasks in a threadpool. Issue 206 of the JavaSpecialists newsletter presents one such case: we have multiple connections from ...
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Under the JVM hood – Classloaders

Classloaders are a low level and often ignored aspect of the Java language among many developers. At ZeroTurnaround , our developers have had to live, breathe, eat, drink and almost ...
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Java Object resurrection

Overview After an object which overrides finalize() is collected it is added to a finalization queue to be cleaned up after calling the finalize() method of each object.  By what happens ...
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Java – far sight look at JDK 8

The world is changing slowly but surely. After the changes that gave java a fresher look with JDK 7, the java community is looking forward to the rest of the improvements that will ...
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Performance of inlined virtual method invocations in Java

Overview One of the benefits of dynamic compilation it the ability to support extensive method inlining on virtual method code. While inlining the code improves performance, the code ...
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The Java ByteBuffer – a crash course

In my experience, java.nio.ByteBuffer is a source of confusion and subtle bugs when developers first encounter it, because it is not immediately obvious how to use it correctly. It ...
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Should I use a 32- or a 64-bit JVM?

This is a question I have faced several times during my career in enterprise software development. Every once in awhile I’ve had to hand out recommendations for configuring a specific ...
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Escaping the JVM heap for memory intensive applications

If you’ve ever allocated large Java heaps, you know that at some point – typically starting at around 4 GiB – you will start having issues with your garbage collection ...
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