Question

I have created an application to generate barcode images which store the images in public/images/barcode using the following code

String dir = Play.application().getFile("public/images/barcode").getAbsolutePath();
String barcode = "46062161";
BarcodePrinter.print(barcode,dir + "/"+barcode+".png"); 

public class BarcodePrinter{ 
  private static void Save_image(Image image,String filePath)
  {
    try 
    {
      BufferedImage bi = (BufferedImage) image;
      File outputfile = new File(filePath);
      ImageIO.write(bi, "png", outputfile);
    } catch (IOException e) 
    {
      Logger.info(e.getMessage());
    }
  }
}

and in my view file

@imgpath(barcode:String) = @{
"/assets/images/barcode/"+barcode+".png"
}
<img src="@imgpath(barcode)" />

this code work only on development and it does not work in heroku. I got this error from logs

java.io.FileNotFoundException: /app/target/../public/images/barcode/46062161.png (No such file or directory)

please help me to solve this problem. Thanks

Answer 1

You probably don’t want to write to the file system on heroku anyway. Here is the relevant part of the documentation:

Ephemeral filesystem

Each dyno gets its own ephemeral filesystem, with a fresh copy of the
most recently deployed code. During the dyno’s lifetime its running
processes can use the filesystem as a temporary scratchpad, but no
files that are written are visible to processes in any other dyno and
any files written will be discarded the moment the dyno is stopped or
restarted.

The best solution would probably be a cloud storage service like S3.