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Local variables inside a loop and performance

Overview Sometimes a question comes up about how much work allocating a new local variable takes.  My feeling has always been that the code becomes optimised to the point where this ...
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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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Can synchronization be optimised away?

Overview There is a common misconception that because the JIT is smart and synchronization can be eliminated for an object which is only local to a method that there is no performance ...
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JAXB – Representing Null and Empty Collections

Demo Code The following demo code will be used for all the different versions of the Java model. It simply sets one collection to null, the second to an empty list, and the third to ...
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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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Chunk Oriented Processing in Spring Batch

Big Data Sets’ Processing is one of the most important problem in the software world. Spring Batch is a lightweight and robust batch framework to process the data sets. Spring Batch ...
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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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