JVM Heap & GC Tuning…
So, obviously, I haven’t posted anything here in a while🙂. Life has been busy. Starting several months ago, I left my job of four years and began independent consulting. Among other things, this means that the variety of topics discussed on thinkmiddleware.com should be more varied. I’m also going…
Running JBoss on an OpenJDK6 build
Recently, I had some free time and set out to bring up JBoss on OpenJDK6. In particular, I wanted to Run JBoss on an OpenJDK build that I personally compiled.
URL & HTML Character Representation
I’ve had to look up the HTML codes for special characters like space many times. In fact, while writing blog entries for Thinkmiddleware.com, I’ve had to stop and look up the HTML code for less-than sign and greater-than sign one to many times. I just haven’t bothered memorizing them.
Capturing JVM TCP Traffic
Any time you have a distributed application, there is network communication involved. Capturing this network traffic can be instrumental in diagnosing and solving problems. Generally, to capturing network traffic, superuser privledges, timing, and a bit of luck is needed. Often, the appropriate…
Websphere v6.x Classloaders
Building on the ideas introduced in the last article, a J2EE Application servers classloaders are explored in this installment. In particular, Websphere Application Server v.6.x Classloaders are introduced. The J2EE Spec provides some guidance regarding J2EE Application Servers, but as with so many…
Java Virtual Machine Classloaders
Classloaders are responsible for finding and loading classes that are requested in Java code executed inside a Java Virtual Machine. Classloader-related issues are among the most difficult to troubleshoot in the Java/J2EE technology stack.
Computer Measurement Prefixes and Number Naming Conventions
I always forget the quantity prefixes above “tera”. Even more interestingly, one rarely thinks about the numbers’ names. For example, consider the number
JVM process Virtual Memory Usage (Resident Set Size) On A Linux 2.6.25 Kernel
This article expands on the previous Virtual Memory post by exploring Resident Set Size growth while running a Java program that will consume all available Java Heap memory. Four different JVM implementations are used to compare results of these experiments. These JVMs come from two different…
The Java Security Manager
In the last post, the Java Standard Edition and Java Enterprise Edition security features were introduced. This is the second in a series of articles that introduces each Java security feature in depth. This article introduces the Java Security Manager and the sandbox it creates for a Java…
Java Security — The Low-Level details To J2EE Security–And, Beyond
While researching details for a Java Security Manager article, it became obvious that I didn’t understand the mappings of all the different Java, security-related specifications to the technologies and acronyms I knew. Thus, was the beginning of this article. Below each security-related feature in…
Concurrency And Server-Side Networking APIs — Part 4
The original article can be found here. Introduction
Concurrency And Server-Side Networking APIs — Part 3
This is part three of an exploration of how concurrency in networking APIs works in Unix-like operating systems and Java technology. This article now looks at the Java equivalents of several C-based server implementations that have been presented. If you haven’t read this series from the beginning,…