Akka HTTP Quickstart for Java

Running the application

When you run the example for the first time, you were able to create and retrieve multiple users. Now that you understand how the example is implemented, let’s confirm that the rest of the functionality works. We want to verify that:

• If we try to retrieve users when none exist, we get an empty list.
• If we try to retrieve a particular user that doesn’t exist, we get an informative message.
• We can delete users.

To test this functionality, follow these steps. If you need reminders on starting the app or sending requests, refer to the instructions in the beginning.

1. If the Akka HTTP server is still running, stop and restart it. 2. With no users registered, use your tool of choice to: 3. Retrieve a list of users. Hint: use the GET method and append /users to the URL.

You should get back an empty list: {"users":[]}

4. Try to retrieve a single user named MrX. Hint: use the GET method and append users/MrX to the URL.

You should get back the message: User MrX is not registered.

5. Try adding one or more users. Hint: use the POST method, append /users to the URL, and format the data in JSON, similar to: {"name":"MrX","age":31,"countryOfResidence":"Canada"}

You should get back the message: User MrX created.

6. Try deleting a user you just added. Hint: use the DELETE, and append /users/<NAME> to the URL.

You should get back the message: User MrX deleted.

Tutorial done!

Congratulations! You can start building real-world applications that use Akka HTTP. Of course, we didn’t have time to cover all Akka HTTP features in this short guide. See the documentation to learn more.