Rafael wrote:Do you know of any java project, preferably some application with social objective, where you can collaborate as a programmer on a voluntary basis?
Welcome to the Ranch, Rafael.
Hmmm social objective, can you be more specific as it's a relative term.what is your perspective ? Do you mean open source, their are many on GitHub, Go and explore them as per your requirement.
Note: The link i have attached contains a variety of projects which are both as large as JUnit and small as a HelloWorld Example.
Hope it helps!
Try to enjoy your work while doing it,it will Automatically convert in Hard Work...