Home » Author Archives: Kees Jan Koster

Author Archives: Kees Jan Koster

Dealing With Slow Resource Leaks


Finding resource leaks using Java-monitor Finding slow resource leaks is key to keeping your application servers up and running for very long times. Here I explain how I use Java-monitor to spot slow resource leaks and how to verify that they are actual leaks and not just extra pre-allocation into some HTTP connector or database pool. If you follow these ...

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Zero-downtime Deployment (and Rollback) in Tomcat; a walkthrough and a checklist


Dear All, If you thought Tomcat could not get any better, you thought wrong. Tomcat 7 introduces what is called Parallel Deployment. This was contributed by SpringSource/VMWare. Simply put, parallel deployment is the ability to deploy more than one version of your web application in parallel, making all versions available under the exact same URL. Think about this for a ...

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Erlang vs Java memory architecture


I read a really, really interesting article on memory management strategies for the Erlang VM. It was written as a thesis by Jesper Wilhelmsson I thought it might be nice to discuss the differences between Erlang‘s memory setup and Oracle’s Java VM. As a real short introduction for those who have never heard of Erlang; it is a functional language ...

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