A few weeks ago I wrote another article explaining how to install and run Atlassian JIRA in Ubuntu. Well, I was not quite satisfied with the results, so I tried another approach and it seems to be working better now as my previous JIRA installation was extremely slow and crashed due to Out of Memory errors.

So here are the steps:
1. Install Java

I use Atlassian JIRA as a tool to control my software development process, registering issues, tasks and bugs and planning development cycles.
So now that I switched to Ubuntu as development platform, I need to setup JIRA on my new Linux machine. I wrote down the steps I followed to achieve this.

1. Install Java
First of all, of course, install Java in your Ubuntu server and test the installation:

I downloaded and installed today the Netbeans 6.7 and for my surprise its IDE was in Portuguese. I prefer using the IDE in English, so I tried to change it using the way I remembered from previous versions, i.e. at the Tools menu. As it happens, it is not possible to change the language of the IDE through the interface, because it is based on the locale of your machine.

The guys from zeroturnaround ran an interesting survey regarding Java EE development, containers and redeploy times. As a result from this survey they've just published an article comparing the impression of the community towards the most used containers. It is quite a long interesting article.

Do you see your life in there? :)

Hi guys and gals, these are the slides of the speak I gave at Just Java 2009. This is the largest event for the Java Community in Brazil and I spoke about UOL and how we have a deep IT culture.

The slides are in portuguese.

Calculating the difference in days between two dates in Java sounds like a trivial task, but it turns out to be otherwise. To keep track of time, Java counts the number of milliseconds from the start of January 1, 1970 and this is called the epoch. Many programmers then think that subtracting the millisecond timestamps of two moments and dividing by the number of milliseconds per day is the right way to calculate the difference between two dates. The code below is as simple as it could be, but it is also as wrong. Here is why:

Well, I am now just trying to use Ubuntu as a development environment. First thing I noticed is that there are more than one jre already installed by default in the system, and here is the evidence:


jars@jars-desktop:~$ locate /rt.jar
/usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar
/usr/lib/jvm/java-6-sun-1.6.0.07/jre/lib/rt.jar


I really wanted to use the Sun JDK for my development instead of OpenJDK, so I installed the Sun Java.

Just type the command below and compare the results:

I was struggling with a stupid problem this week and it took me some time to realize what was going on, so I will post here the solution so nobody else needs to waste time on this matter again (and for future reference for myself as well ;)).

I wanted to read a .csv (comma separated value) text file that was inside one package in my application. Consider the simplified version of my code in the tree below.