I have an error in application deployment with "git push master heroku" while locally it works fine. I want to use my persistence.xml for access to my data base of H2 (I will be use maybe PostgreSQL) all with my data source on WildFly 10.
I found no reference other than the Spring. (I can not use it)
Thank you!
I've deployed JavaEE web app (with jsf, javabean, ejb, di etc) on Heroku. Heroku will allow you to run shell script for starting your application like class with a main method or executable .jar file. Not on the pre installed fullstack application server. Also if you gonna run java app on Heroku your project should be maven.
To make it work from command line you can use cloud ready run anywhere tiny servers like payara-micro, wildfly-swarm, spring-boot. It turns your app and server into single executable jar (Uber JAR). Also tomcat and jetty have wrappers for build uberJar.
I use payara-micro and it's great that very little jar can run almost all of JavaEE features with session replication. Follow this link for instructions payara-micro how to (read also maven parts).
When you git push to Heroku(with heroku cli tool) it will automatically builds your project and run script from file called Procfile from your project root directory. Sample procfile:
web: java -jar target/myapp.jar --port $PORT
Consider $PORT part from above snippet. When Heroku runtime (dyno) starts it will open random port (I think so) and bind to $PORT environment variable. So here I'm passing that accessibe port to payara-micro server for listen. Other mentioned servers should work with similar procedures. You can find documentations at heroku devcenterr
For JPA and database connectivity Heroku provides JDBC_DATABASE_URL and DATABASE_URL environment variables that have connection information (url etc) for you to connect database. I couln't find the way to hook up those variables into persistence.xml. But you can create and configure EntityManagerFactory and EntityManager programmatically.
Hope it helps.
