Posts about technology and arts.

git clone fails with fatal: Unable to find remote helper for 'https'

I've been working in a client site without Internet connection, and behind a troll proxy. There is an internal yum repository, but many dependencies are missing.

There weren't git-all, git or git-core packages there, so I had to download and install from sources. I didn't pay attention to the ./configure output and proceeded with make and make install.

Git was installed and ready to rock, but in my first git clone https:// (SSH ports are blocked) I received: fatal: Unable to find remote helper for 'https'.

Turns out that I was missing libcurl-devel, though I did have curl. After installing libcurl-devel and installing from sources again all worked fine.

Using Apache Commons Functor functional interfaces with Java 8 lambdas

Apache Commons Functor (hereon [functor]) is an Apache Commons component that provides a functional programming API and several patterns implemented (visitor, generator, aggregator, etc). Java 8 has several nice new features, including lambda expressions and functional interfaces. In Java 8, lambdas or lambdas expressions are closures that can be evaluated and behave like anonymous methods.

Functional interfaces are interfaces with only one method. These interfaces can be used in lambdas and save you a lot of time from writing anonymous classes or even implementing the interfaces. [functor] provides several functional interfaces (thanks to Matt Benson). It hasn't been released yet, but there are some new examples in the project site, in the trunk of the SVN. I will use one of these examples to show how [functor] functional interfaces can be used in conjunction with Java 8 lambdas.

After the example with [functor] in Java 8, I will explain how I am running Java 8 in Eclipse (it's kind of a gambiarra, but works well).

Running BDD tests from TestLink in Jenkins

Last night and this morning I spent some time working on running BDD tests that were created in TestLink in Jenkins, using testlink-plugin.

Similar integration has already been proposed in JinFeng, by Olivier Renault. Basically, you write BDD stories in TestLink (a story goes into the Test Case summary), Jenkins retrieves these stories and executes them using a skeleton project.

There are many ways to use BDD. In some of them you write code like Java, Ruby or Perl, and in others you write a DSL. I started working with JBehave, but for this integration, I preferred to use a DSL - as TestLink doesn’t maintain source code, only test cases -, so I switched to easyb.

A quick view on Wordpress, Mantis and Jenkins plug-in API

I'm preparing a plug-in API proposal for TestLink, and thought that the best way to learn how to write a good plug-in API would be by looking at other application's plug-in API's.

This post contains information that I gathered for creating this new API, but that may also be useful for other programmers. I used Wordpress, Mantis and Jenkins in this study. Let me know if you find any mistakes or if you have any other suggestions.

Replacing a HashSet with a BitSet

I always read the messages in the Apache dev mailing lists, including Apache Commons dev mailing list. And you should too. There are always interesting discussions. Sometimes you participate, other times you only watch what's happening, but in the end you always learn something new.

A few days ago, I found an issue where it was being proposed to replace an unnecessary HashSet in ArrayUtils#removeElements() by a BitSet. Here's how the code looked like: