Docker image build with maven doesn't see static files

Question

I have a simple Java backend build with Maven. When I create .jar file with mvn clean install, I can run it and everything works fine.

However, when I deploy it to Docker, the server runs, but when I make a GET call, the backend doesn't see static .png file located in src/main/resousces/.

java.io.FileNotFoundException: /src/main/resources/logo.png (No such file or directory)

The image is uploaded to docker with this .gitlab-ci.yml file:

services:
  - docker:dind

before_script:
  - docker info

maven-build:
  stage: build
  tags:
    - maven3-jdk11
  except:
    - tags
  script:
    - mvn deploy -B -U

maven-release:
  stage: deploy
  tags:
    - maven3-jdk11
  only:
    - tags
  script:
    - mvn deploy -B -Prelease-profile -Dmaven.javadoc.failOnError=false

(This is my first time working with Maven and Docker, so if the information I provided is not sufficient, please leave a comment.)

How are you referencing the file in your code? – 1615903 May 13 '20 at 04:28 — 1615903, May 13 '20 at 04:28

score 2 · Answer 1 · answered May 14 '20 at 09:23

Okay, I managed to solve it using java ClassLoader.

Originally, I loaded the .png file like this:

Image logo = new Image(ImageDataFactory.create("src/main/resources/logo.png"));

I changed that to following and now it works like charm:

ClassLoader classLoader = getClass().getClassLoader();
Image logo = new Image(ImageDataFactory.create(classLoader.getResource("logo.png")));

I accepted Eugene's answer to boost his reputation, he moved me in the right direction.

score 1 · Accepted Answer · answered May 12 '20 at 12:45

1

Unpack your jar file and check if .png file in it. If not, you need to package a jar with the resources folder. If yes, so you need to specify the path to file using classpath.

answered May 12 '20 at 12:45

Eugene Makarenko

96
5

It's there in `BOOT-INF/classes` folder. Could you specify what you mean by using classpath? – druskacik May 12 '20 at 12:54
You can see here - https://stackoverflow.com/questions/3160691/how-to-read-properties-file-in-web-application – Eugene Makarenko May 12 '20 at 12:56

Docker image build with maven doesn't see static files

2 Answers2