Upload File by API when using Docker

Question

I am writing a spring boot application that has a PostgreSQL database. I have an API in my controller that gets a file as

@RequestParam("file") MultipartFile file

and saves the file in a folder in the project's root folder. but when I'm using docker after calling the API no file is being saved in any folder or maybe I don't know where it is saved in the container. I am using docker-compose for running the project and here are my application.properties and docker-compose.yml files:

application.properties:

spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.platform=postgres

spring.datasource.url= jdbc:postgresql://localhost:5432/myDB?useSSL=true
spring.datasource.username= myusername
spring.datasource.password= mypassword
    
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation= true
spring.jpa.properties.hibernate.dialect= org.hibernate.dialect.PostgreSQLDialect
spring.jpa.hibernate.ddl-auto= update


## MULTIPART (MultipartProperties)
# Enable multipart uploads
spring.servlet.multipart.enabled=true
# All files uploaded through the REST API will be stored in this directory
file.upload-dir=E:uploadedFilesOfMyProject

docker-compose:

version: '3.1'
services:
  API:
    image: 'myJar.jar'
    ports:
      - "8080:8080"
    depends_on:
      PostgreSQL:
        condition: service_healthy
    environment:
      - SPRING_DATASOURCE_URL=jdbc:postgresql://PostgreSQL:5432/myDB
      - SPRING_DATASOURCE_USERNAME=myusername
      - SPRING_DATASOURCE_PASSWORD=mypassword
      - SPRING_JPA_HIBERNATE_DDL_AUTO=update

  PostgreSQL:
    image: postgres
    ports:
      - "5432:5432"
    environment:
      - POSTGRES_PASSWORD=mypassword
      - POSTGRES_USER=myusername
      - POSTGRES_DB=myDB
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U myusername"]
      interval: 10s
      timeout: 5s
      retries: 5

I have set the directory as follows in the application.properties and when I use postman to upload files, nothing is saved in this folder when the project is running by docker-compose up

file.upload-dir=E:uploadedFilesOfMyProject

where am I doing wrong? what did I misunderstand?

If anyone could help me I would be very appreciative.

Answer 1

this is the final docker-compose.yml file I used: I hope it will help others too:

version: "3.8"
services:
  pg_db:
    image: postgres
    restart: always
    volumes:
      - "./postgres/data:/var/lib/postgresql/data"
    ports:
      - 5432:5432
    environment:
      POSTGRES_USER: 
      POSTGRES_PASSWORD: 
      POSTGRES_DB: 
    networks:
      - product-net

  api_service:
    build: .
    restart: always
    ports:
      - 8080:8080
    depends_on:
      - pg_db
    networks:
      - product-net

networks:
  product-net:
    driver: bridge

volumes:
  pg_db:
    driver: local

Answer 2

I think your problem is that you have to define the environment "uploadedFilesOfMyProject" in your composer file for your application.

Regards, Josef