The Collections and Threads tasks still open

Two tasks are still open for submissions – the Collections task (deadline 9.6.2017.) and the Threads task (deadline 15.6.2017.). Please see the corresponding topic pages for details.

Maven task announced

The Maven task has just been announced. Please see the Maven topic page for details.

JSON task is published

Task for the JSON badge has been published. Deadline for completing the task is 01.06.2017.