| | | | Understanding the Java Virtual Machine
JVM: How to analyze Thread Dump
This article will teach you how to analyze a JVM Thread Dump and pinpoint the root cause of your problem(s). From my perspective, Thread Dump analysis is the most important skillset to master for any individual involved in Java EE production support. The amount of information that you can derive from Thread Dump snapshots is often much beyond than what you can think of.
Investigating Memory Leaks - Writing Leaky Code
I found this little problem the other day: there's this server that runs for a while and then falls over. It's then restarted by its startup script and the whole process repeats itself. This doesn't sound that bad as it isn't business critical although there is a significant loss of data, so I decided to take a closer look and to find out exactly what's going wrong. The first thing to note is that the server passes all it's unit tests and a whole bunch of integration tests. It runs well in all test environments using test data, so what's going wrong in production?
Java VM - Beware of the YoungGen space
A healthy JVM is one of the most important goals to achieve for optimal application performance and stability. Such health assessment is very often only focusing on the frequency (avoidance) of major collections or detecting the presence of memory leaks. What about the sizing and footprint of the Young Generation space or short lived objects? This article is based on a true story and a recent troubleshooting experience we had with one of our IT clients.
Mastering Java Bytecode
Java was a language designed to run on a virtual machine so that it only needed to be compiled once to run everywhere (yes, yes, write once, test everywhere). As a result, the JVM which you install onto your system would be native, allowing the code that runs on it to be platform agnostic. Java bytecode is the intermediate representation of the Java code you write as source and is the result of you compiling your code. So your class files are the bytecode.
Java 8: From PermGen to Metaspace
One of these features in JDK 8 is the complete removal of the Permanent Generation (PermGen) space which has been announced by Oracle since the release of JDK 7. Interned strings, for example, have already been removed from the PermGen space since JDK 7. The JDK 8 release finalizes its decommissioning. This article will share the information that we found so far on the PermGen successor: Metaspace.
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