This document discusses deploying Java and Play! applications on Heroku. It describes how Heroku provides a managed platform-as-a-service that eliminates the need to provision and manage servers and software stacks. With Heroku, developers can focus on their code without worrying about operations. The document provides examples of using common Heroku commands to deploy an app, connect to databases, create worker processes, and use add-ons. It also gives a brief overview of the Play! web framework and how to deploy Play! apps on Heroku.

1. Deploying Java and Play!
Apps on Heroku
Sandeep Bhanot
@cloudysan

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3. Once upon a time….
Tim wanted to develop a Java app……

4. So he got to work….
• Acquire and provision all the H/W (Servers, Load Balancers, Routers etc.)
• Install, configure and tune the entire S/W stack (OS, Web/App Server, DB etc.)
• Configure env. for Application services like Routing, Clustering, Load Balancing,
DR, Caching, DB Replication etc ($$$)
• Patch and upgrade the H/W and S/W stack
Cost
Agility

5. One day….
Tim decided to try this ‘Cloud’ thingy……

6. So he tried an IAAS provider….
• NO H/W to buy/install/configure!
• Still has to configure and tune the entire S/W stack (OS, Web/App Server, DB etc.)
• Still has to configure (and sometime code) env. for Application services like
Scaling, Routing, Clustering, Load Balancing, DR, DB replication etc
• Patch and upgrade the S/W stack
Cost
Agility

7. Finally….
Tim heard of Heroku

8. When Tim met Heroku….
• NO Servers
• Managed S/W stack (OS, Web/App Server, DB etc.)
• Application services like Routing, Load Balancing and DR built-in
• Elastic scaling
• git push heroku master
Focus on your Code. Period.
Cost
Agility

9. Heroku = Polyglot Cloud Platform
402,550+ Apps Running on Heroku

10. $ heroku create –s cedar
$ git push heroku master

11. Create more web processes:
$ heroku scale web=2
What processes are running:
$ heroku ps

12. Check the logs:
$ heroku logs

13. View releases:
$ heroku releases
Rollback:
$ heroku rollback

14. Run a process:
$ heroku run "your bash command"

16. Deploying web apps...
Environment (Runtime, configuration, etc)
Ingredients (Dependencies, app, services, etc)
Process (Build, assemble, start, etc)
Environment + Ingredients + Process = web 1!
Environment + Ingredients + Process = web 2!

17. Externalize Environment Variables
$ heroku config
DATABASE_URL = postgres://blah:blah@ec2.compute-1.amazonaws.com/blah
JAVA_OPTS = -Xmx384m -Xss256k -XX:+UseCompressedOops
MAVEN_OPTS = -Xmx384m -Xss256k -XX:+UseCompressedOops
PATH = .maven/bin:/usr/local/bin:/usr/bin:/bin
REDISTOGO_URL = redis://redistogo:1234asdf@angler.redistogo.com:9291/
REPO = /app/.m2/repository

18. Ingredients defined (pom.xml)
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-webapp</artifactId>
<version>${jetty.version}</version>
</dependency>
<dependency>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jsp-2.1-glassfish</artifactId>
<version>2.1.v20100127</version>
</dependency>
<dependency>
<groupId>postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.0-801.jdbc4</version>
</dependency>

19. Process defined (Maven + Procfile)
web: sh target/bin/webapp

20. Don't Share-Something

21. Share-Nothing
Move state to the isolated & independent edges
- UI state -> client
- Permanent state -> external data stores

22. Deploy an app on Heroku
1. Create a Java Web App
2. Add a Procfile
3. Commit to a git repo
4. Create an app on Heroku
5. “git push” to Heroku
6. Scale and monitor on Heroku

23. Connect to a Database
• Free shared PostgreSQL DB
• Dedicated & managed PostgreSQL DB
• Amazon RDS MySQL & Oracle
• NoSQL Add-ons (Redis, MongoDB, etc)
• Database.com
• Or do your own thing

24. Transform DATABASE_URL
Heroku:
postgres://[username]:[password]@[server]/[db-name]
JDBC:
jdbc:postgresql://[server]/[db-name]?user=[username]&password=[password]
Transform:
dbUrl = dbUrl.replaceAll("postgres://(.*):(.*)@(.*)",
"jdbc:postgresql://$3?user=$1&password=$2");

25. Create a Worker Process
1. Create a process
2. Update the Procfile
3. Push to Heroku
4. Scale the workers

26. Using a Heroku Add-on
• Find an Add-on: http://addons.heroku.com
• Activate the Add-on
• Use the service
• Push to Heroku

27. Play!
• A Java framework for Web Applications
• Non Servlet or JEE based
• A full stack framework
• Focuses on productivity and fun

28. Play! on Heroku
1. Create Play app
2. Add app to git repo
3. Create app on Heroku
4. Push app to Heroku

29. 750 free dyno hours
per month per app

30. heroku.com/java
github.com/heroku/java-workbook
@cloudysan