Java 8: From PermGen to Metaspace

As you may be aware, the JDK 8 Early Access is now available for download. This allows Java developers to…

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QOTD: Java Thread vs. Java Heap Space

The following question is quite common and is related to OutOfMemoryError: unable to create new native thread problems during the…

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Java heap space, native heap and memory problems

Recently, I was discussing with a friend, why the Java process uses more memory than the maximum heap that we…

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Java Thread: retained memory analysis

This article will provide you with a tutorial allowing you to determine how much and where Java heap space is…

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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…

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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…

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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…

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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…

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Why can’t I turn off the Garbage Collector?

Let’s start with a quick rewind to the early days of my career as a Java developer. I wanted to…

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