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Yearly Archives: 2012

Sending Event Invitations With Seam

These days one of my colleagues had problems with sending event invitation using mail templates with seam (version 2.x). In basic this should not be a hard task, so I will in short explain what need to be done for sending event invitation using seam mail templates. When you send mail invitation you need to send an email with attachment ...

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Compact Off-Heap Structures/Tuples In Java

In my last post I detailed the implications of the access patterns your code takes to main memory. Since then I’ve had a lot of questions about what can be done in Java to enable more predictable memory layout. There are patterns that can be applied using array backed structures which I will discuss in another post. This post will ...

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Should you care about Conway’s Law?

Conway’s Law says that “organizations which design systems (in the broad sense used here) are constrained to produce designs which are copies of the communication structures of these organizations.” [emphasis mine] This was an assertion made in the 1960s based on a small study which has now become a truism in software development (it’s fascinating how much of what we ...

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Eclipse refactoring on steroids

In my last post about common Java violations, I listed a set of mistakes that java developers tend to make. While refactoring a Java project with the objective to resolve those violations, I used the refactoring features of Eclipse extensively to quickly change the code. Below is the compilation of such refactoring techniques. 1. Adding curly braces around block level ...

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Apache OpenOffice just graduated from the Incubator

Apache OpenOffice has just made it out of the Incubator and is now an official Apache Software Foundation project. “What?”, might some people ask now, “wasn’t it official before a year or so?”. No, it wasn’t! When Oracle decided to donate OpenOffice.org to the Apache Software Foundation, it entered the so called Incubatorfirst. That was back in June 2011. And ...

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Spring MVC for Atom Feeds


How to add feeds (Atom) to your web application with just two classes? How about Spring MVC? Here are my assumptions: you are using Spring framework you have some entity, say “News”, that you want to publish in your feeds your ‘News’ entity has creationDate, title, and shortDescription you have some repository/dao, say ‘NewsRepository’, that will return the news from ...

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Generate QR Code image from Java Program

If you are tech and gadget savvy, then you must be aware of QR codes. You will find it everywhere these days – in blogs, websites and even in some public places. This is very popular in mobile apps, where you scan the QR code using a QR Code scanner app and it will show you the text or redirect ...

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Clean code with aspects

In my previous post I’ve described the alphabet conversion, and I’ve mentioned that we used AspectJ to resolve that task, but i did not mention how AspectJ works and what are aspects generaly. So in the next few lines i will explain: what is Aspect Oriented Programming and why we need it what is AspectJ using AspectJ with Spring (configuring ...

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