The Dog dictionary API exercise

Exercise with javalin and CRUD

In this exercise we want to create a small API for a dog dictionary. The API should be able to handle CRUD operations for dogs. Just to get our feet wet with REST APIs and Javalin.

1. Setup project with javalin

2. Create a new javalin server running on port 7007 that can handle the following routes representing a dog ressource:

   Method	Endpoint	Comment
   GET	/dogs	Returns all dogs from an in-memory collection of dogs (You decide the data structure)
   GET	/dog/{id}	Returns a specific dog based on the id
   POST	/dog	Creates a new dog
   PUT	/dog/{id}	Updates an existing dog
   DELETE	/dog/{id}	Deletes an existing dog

This table organizes the endpoints neatly, making it easy to read and understand each method’s purpose.

1. Setup the server so that all dog endpoints are under the path /api/dogs
2. Let the dogs live in a map in memory with the id as key and the dog as value.
3. Create a new class called DogDTO.java in a src/main/java/dtos folder with fields: id, name, breed, gender, age.
4. Create a new class called DogController.java in a src/main/java/controllers folder with the following methods:

• getAllDogs()
• getDogById()
• createDog()
• updateDog()
• deleteDog()

1. Make sure that the server returns json for all endpoints.
2. Make sure to return 404 when a dog is not found.