A Java based API Service built with Spring Boot, and Redis and deployed on Heroku.

• Prerequisites :
  • A local redis instance instance should be up and running before running our service.
• Import the maven project in eclipse
• Navigate to URLRepository class and replace

reJedis = new SpringConfig().getJedisPool().getResource();

with

reJedis = new redis();

• Now go to application.java and run as java application
• Your server is up and running now.
• By default the Server will run on localhost:8080/shortener
• To test, send POST Request to localhost:8080/shortener with a body of type application/json with body { 'url' : '' }

• Build the project with mvn clean package
• Goto target folder you get a packaged jar to deploy whereever you want. :)

• Create a Heroku account.
• Install the Heroku CLI.
• Set up Heroku locally using your

Heroku login. 

• Once it is done, the steps are straightforward

git init
git add .
git commit -m "initial commit"
 
# creates a heroku application with random name (and Domain)
# creates a git repository at heroku
# registers the remote repository by the name heroku
heroku create
 
#Pushes the source code to the heroku git repo, so heroku can build and deploy it
git push heroku master
 
#opens our app in a browser 
heroku open

• Now our application is up and running but we have not deployed any redis instance for our application
• Search for Heroku redis in add on section from dashboard.
• click on install.
• Now verify if redis is up and running by typing

$ heroku config
#You should get the similar output
REDIS_URL: redis://h:[email protected]:111

• Note : Now the most important step is to disable connection pool timout for redis instance otherwise our pool get terminated by default after 5 min.
• on console type

heroku redis:timeout redis-elliptical-39032 --seconds 0

• Here redis-elliptical-39032 is redis instance name.
• If you get the following output. Voila your REST API is up and running with full functionality enabled. You can try hitting the api endpoints now.

After pushing code to the remote repository named Heroku, the build process is triggered. Given that the project has a pom.xml, Heroku recognizes it as a Java application. Spring Boot has an embedded Tomcat. Therefore, it can be started up as a JAR file and will work as a web server.