As a Java EE developer, I sometimes envy how fast it’s possible to see the result of a code change in a running application with interpreted languages like PHP or JavaScript. With Java, it’s always necessary to rebuild the source code in a bytecode, which can be then safely updated only by restarting the whole application. And all developers know that restoring the desired state of the application after a fresh restart takes time and is tedious.

Many developers know that JRebel can help a lot with updating the code on the fly. There’s been a lot of effort put into it to support all sorts of code and resource changes and refresh them with virtually any Java framework used by the application. But the downside is that it’s pretty expensive for a casual developer, doing just some hacking on his/her own or working on a non-commercial project. I have some experience with JRebel and I liked it a lot, but I was using it on a commercial project where I didn’t pay for the license. A while ago I’ve come across an opensource alternative called HotswapAgent, which has worked very well for me for my personal Java EE projects. I’m going to write up how I got it running in my IDE and my Java EE server of choice – Payara Server. (more…)

A singleton pattern is probably the simplest well-known design pattern, but still people often implement it incorrectly in Java. (more…)

Ever wondered why Eclipse/Netbeans keeps pausing for a while every now an then? Especially right at the time when you want to show something in the code to your dear colleages? It feelt embarrassing and awkward, didn’t it?

I found out that most of the time the IDE pauses because of Garbage Collector execution. The subtle little element in design of JVM, which usually does great job in relieving us developers from worrying about memory consumption, and most people are just happy that it does its job well and ignore it most of the time. However, the consequences of running Garbage Collector may surprise us if we simply ignore it. (more…)

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