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JRockit – JRCMD useful commands

I have been using JRockit since many years 2007. I find it slower than Hotspot, but it has been always better on diagnosis and analysis of problems. Since last summer, I have been working ...
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Top 5 Reasons for Not Using JavaDoc in the Next Project

JavaDoc is an absolutely must for the development of frameworks and libraries which provide a public interface for others, e.g. Spring Framework, JDKs. For in house enterprise software ...
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Odd practices in Java

Overview There are a number of practices in Java which oddly baffle me. Here are but a few. Using -Xmx and -Xms The option -Xmx is widely used to set the maximum memory size. As noted ...
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Tracking excessive garbage collection in Hotspot JVM

Quite frequently due to memory leaks or other memory problems applications freeze leaving only the garbage collector (GC) process running unsuccessfully trying to free some space. ...
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Java Thread deadlock – Case Study

This article will describe the complete root cause analysis of a recent Java deadlock problem observed from a Weblogic 11g production system running on the IBM JVM 1.6. This case ...
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JavaOne 2012 – 2400 hours to go! Some recommendations

As you might have seen the JavaOne 2012 Content Catalog is online. The Program Committee had some very intense weeks of sorting, reviewing, rating and discussing ...
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java.lang.NoClassDefFoundError: How to resolve – Part 2

This article is part 2 of our NoClassDefFoundError troubleshooting series. Take a look at part 1. It will focus and describe the simplest type of NoClassDefFoundError problem. This ...
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Just in Time Compiler (JIT) in Hotspot

The Just In Time Compiler (JIT) concept and more generally adaptive optimization is well known concept in many languages besides Java (.Net, Lua, JRuby). In order to explain what is ...
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A Birds’s Eye View of Maven

One of the things that we do on a daily basis is use Maven to build our projects by issuing build commands such as mvn install. Maven then looks at our project’s configuration file, ...
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java.lang.NoClassDefFoundError: How to resolve – Part 1

Exception in thread ‘main’ java.lang.NoClassDefFoundError is one of the common and difficult problems that you can face when developing Java EE enterprise or standalone ...
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