Load file from '/conf' directory on Cloudb

问题:

What we do :

We run Play2 application on Cloudbees and we load a file from '/conf' directory (inside the classpath of the application).

These 2 snippets work in local and at heroku

Play.application().getFile("conf/myfile.json")

and

new File("conf/myfile.json")

However, on Cloudbees, we get FileNotFoundException :

java.io.FileNotFoundException: /var/genapp/apps/..../conf/myfile.json (No such file or directory)

So how to load a file from classpath on Cloudbees?

回答1:

Well, files in '/conf' are in the classpath and not on the filesystem so we need to load the file this way :

Play.application.resourceAsStream("myfile.json")
//.resource() also works - depends what we want

Note that we don't put "conf" in the path - files in there are on the classpath in the root.

Note that in production it comes from a jar/zip, not a file - so getFile is somewhat misleading in play.

Michael Neale from Cloudbees opened this issue : https://github.com/playframework/Play20/issues/1079

Cloudbees documentation has been updated : https://wiki.cloudbees.com/bin/view/RUN/Playframework#HLoadingconfigfilesinproduction

回答2:

I am using play 2.4. What works for me was

import play.Play;
import org.apache.commons.io.IOUtils;

  String myfile = IOUtils.toString(Play.application().resourceAsStream("myfile.json"));

NOTE: application() is called as a static method.

回答3:

It seems that Heroku run play apps via "play start" or "play run" which is not the recommended way for play apps to run in production - this explains why "conf" is visible there - although this could change in a future version of play.