I am trying to create a small web server using embedded Jetty. I build it into an "uberjar" using shade plugin for maven. This is my Startup class's main function:
BasicConfigurator.configure();
logger.info("Starting server");
URI baseUri = UriBuilder.fromUri("http://localhost").port(8080).build();
ResourceConfig config = new ResourceConfig(WindowAction.class);
Server server = JettyHttpContainerFactory.createServer(baseUri, config);
server.start();
server.join();
logger.info("Server started");
So far it works locally. I am able to build and run the server standalone locally:
java -jar target/server-0.jar
And the server responds requests to localhost:8080. Awesome. When I run:
heroku local web
Same, the server responds just fine. However, when I push it to Heroku remote, I get a port bind timeout error:
2017-08-08 22:12:52.396:INFO:oejs.Server:main: jetty-9.2.z-SNAPSHOT
2017-08-08T22:12:52.464157+00:00 app[web.1]: 2017-08-08 22:12:52.460:INFO:oejs.ServerConnector:main: Started ServerConnector@5890e879{HTTP/1.1}{0.0.0.0:8080}
2017-08-08T22:12:52.464414+00:00 app[web.1]: 2017-08-08 22:12:52.464:INFO:oejs.Server:main: Started @2891ms
2017-08-08T22:14:17.656011+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 90 seconds of launch
2017-08-08T22:14:17.656011+00:00 heroku[web.1]: Stopping process with SIGKILL
2017-08-08T22:14:17.792987+00:00 heroku[web.1]: Process exited with status 137
2017-08-08T22:14:17.810279+00:00 heroku[web.1]: State changed from starting to crashed
I have tried putting the port in a command line argument to java in the Procfile like so:
$JAVA_OPTS -Dserver.port=$PORT -jar target/myserver.jar
I also tried getting the server port at runtime:
System.getenv("port")
That evaluates to empty string. Maybe Heroku doesn't like to be told that the embedded server will use "localhost" but JettyHttpContainerFactory.createServer needs a URI. Can anyone point me to the proper way to make them play nice?
