How you can insert arbitrary java code into a running Java application (even an application server, like JBoss or WebLogic.) Includes artifacts you can use to quickly cut-n-paste to experiment yourself.

Explains all the steps you need to setup MongoDB - run MapReduce from the shell and via a Java client.

Speech recognition using the Java binding of OpenNI and CloudGarden's TalkingJava SDK, recording with the PC's microphone rather than the Kinect's.

An example of using Powermock to unit test an 'Untestable' class.

A tutorial on how to implement "remember me" functionality with Servlet/JSPs

Today I was faced with a situation where in I need to rename a field in all the MongoDB documents. The best way to do this is using $rename operator shown below.

One of the "new and noteworthy" features of NetBeans 7.1 is the ability to compare two heap dumps. Specifically, the easy-to-use feature allows one to quickly ascertain the difference in number of each class's instances between two dump files. This brief post shows how easy it is to use.

Different Types in Java

There is an increasing number of libraries which are described as high performance and have benchmarks to back that claim up. Here is a selection that I am aware of.

Maven pom.xml extract for Hibernate 4.0.1. Getting the dependencies right when using Hibernate in a java SE environment can take some time initially. This extract makes it easy for anyone to just cut and paste into their maven pom.

The Boehm garbage collector is used by a wide variety of C and C++ programs, and is also used in a number of other language implementations such as D and the GNU Compiler for Java. This article aims to give a high-level overview of how this GC works.

Here’s a nice little gotcha for ya! A fairly common pattern is to use a filter that wraps the (Http)ServletRequest and (Http)ServletResponse in an app-specific wrapper. That enables other filters and servlets can downcast to get at app-specific stuff. Except... you can't always do this.

When I develop web applications I like to be able to quickly start them from Eclipse without having to rely on all kinds of heavy-weight tomcat or glassfish plugins. So what I often do is just create a simple Java based Jetty launcher I can run directly from Eclipse.

Trisha is a developer at LMAX, the London Multi Asset eXchange. She's been working in financial markets for the last 5 years or so, but a fear of boredom and healthy amount of job-hopping before then has given her a wide breadth of experience, in a range of industries, over the 10+ years she's been a professional developer. Currently trying to get her head around low-latency, high performance coding whilst also keeping her fingers in the other pies LMAX has to offer, such as continuous delivery and agile. Trisha is heavily involved in the London Java Community and the Graduate Development Community, she believes we shouldn't all have to make the same mistakes again and again.

Netcraft released its February 2012 Web Server Survey, and Caucho's Resin Application Server has made incredible strides in the last year, gaining 4.2 million hostnames and accounting for 0.77% of the current market share.

Blog about rich client developmet in Java. Focusing on Swing, Java FX and desktop integration.

"Based on the hundreds of samples of Java application object lifecycles we have gathered, the detection algorithm has been tweaked to be more „suspicious“, ie. it now avoids most of the false alerts by collecting some more evidence before announcing the verdict". Plumbr is a real-time Java memory leak detector that also gives precise instructions for solving the leaks.

What do you do if a project isn't going as planned? Well, you could whine about it, or make the best out of it and see the funny side of things. Today, we decided to introduce our Java Coding Achievements. The goal is to get as much achievements per month. A comprehensive list of what can be achieved.

This is one user's unfamiliar experience of writing Java, and his discovery that native Java classes are easy to use in Jruby. Included is a short tutorial on using Glassfish to create a Sinatra App, as well as a useful, albeit in-depth, link to how to install Glassfish server on an Ubuntu server.

Gatling is a stress tool. Development is currently focusing on HTTP support. Motivation: Fed up with fancy GUI that generate huge unreadable XML scenarios, what you want is scripts and a user friendly DSL? Fed up with having to host a farm of injecting servers because your tool use blocking IO and one-thread-per-user architecture? Underlying technologies: Async Http Client and Netty for non blocking HTTP, Akka for actions (requests, pauses, assertions, etc...) modeling and orchestration, Scala interpreter for scripting ...

Cloudshift is a Node.js web application framework coded in haXe, an open-source multi-platform programming language. Being a multi-platform language, haXe targets other platforms, like JavaScript, Flash, NekoVM, PHP, C++, C# and Java etc.

A quick introduction to FEST Fluent Assertions with an example and comparison with Hamcrest.

Attila Szegedi talks about performance tuning Java and Scala programs at Twitter: how to approach GC problems, the importance of asynchronous I/O, when to use MySQL/Cassandra/Redis, and much more.

So which is better, Tegra or OMAP? NVidia will say Tegra of course and TI will say OMAP. Would that mean we should go by the benchmarks? Or may be sheer specifications of both the SoC? Doesn’t OMAP’s memory bandwidth is more than Tegra 3 and Snapdragon? But Tegra 3 is Quad Core, and even GPU is updated? Then why iPad 2 beats Tegra 3 by miles on GLBenchmark? We had a lot of similar questions while we wanted to opt for one. If you followed Kernel developments you’d know that OMAP was definitely the next SoC supported by Google, so this decision had to be made on our end and fast.

First part of an example that uses Jersey and GAE to make a RESTFul Web Service