A restful Scala Play framework 2.4 application using Akka, Reactive Slick 3.0, Akka Actors for ActionLogs, JWT Token user identification and authentication, DDD domain validation, and Guice Dependency Injection

This is a sample application using Scala, PlayFramework, and Postgres.


- Slick FRM for DB connection
- Akka Actors for ActionLog
- Deep validation where all errors, warnings, and info messages are collected and presented
- All REST responses are unified with the same structure every time, so it's easier to handle errors, warnings, and messages as well as specific data on pages.

Responses are structured for global and local messages. Local messages are coupled to some field, e.g., "Username is too long. Allowed length is 80 chars." Global messages are messages that reflect all data on page, e.g., "User will not be active untill is approved." Messages have three levels: ERROR, WARNING and INFORMATION.

(example response: http://demo3385913.mockable.io/api/v1/single-create-response)


- JSON Web Tokens (JWT) for user identification and authentication
- Divided into modules, e.g., user module, organization-structure module, etc. Each module has DAO, domain, validation, and service packages
- Spring dependecy injection

The problem is to find all unique configurations of a set of normal chess pieces on a chess board with dimensions M×N where none of the pieces is in a position to take any of the others. Assume the colour of the piece does not matter, and that there are no pawns among the pieces. Write a program which takes as input:

- The dimensions of the board: M, N.
- The number of pieces of each type (King, Queen, Bishop, Rook and Knight) to try and place on the board.

As output, the program should list all the unique configurations to the console for which all of the pieces can be placed on the board without threatening each other. When returning your solution, please provide with your answer the total number of unique configurations for a 7×7 board with 2 Kings, 2 Queens, 2 Bishops and 1 Knight.

National Champion of Croatia in the Red Bull Paper Wings contest in 2009 and participant in the Red Bull Paper Wings World Championships in Salzburg, Austria, where I took 43rd place.

National Champion of Croatia in the Red Bull Paper Wings contest in 2012 and participant in the World Championships in Salzburg, Austria, where I took 20th place.