How to set path to jar file in Dockerfile?

Question

I'm trying to run Spring application by docker compose up and then I have error

ERROR [2/2] COPY target/*.jar app.jar

My thoughts are that the path is wrong in Dockerfile to jar file.

docker-compose.yml

version: '3.8'
services:
  app-backend:
    image: my-app
    ports:
      - "8010:8080"
  build:
    context: .
    dockerfile: "Dockerfile"

Dockerfile

FROM openjdk:11-jdk
EXPOSE 8010
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} my-app.jar
ENTRYPOINT ["java", "-Dspring.profiles.active=dev", "-jar", "/my-app.jar"]

And here is a structure of my project

So my question is: what is wrong with this path or what causes this error?

Answer 1

I guess you can try using the Makefile to automate some work for you?

here is a sample implementation:

POM_VERSION = $(shell mvn help:evaluate -Dexpression=project.version -q -DforceStdout)

build:
    cp target/app-$(POM_VERSION).jar src/main/Docker/dev/my-app.jar

docker-build: build
    cd src/main/Docker/dev && docker-compose up

place this Makefile in root dir.

and Dockerfile should be:

FROM openjdk:11-jdk
EXPOSE 8010
ADD my-app.jar my-app.jar
ENTRYPOINT ["java", "-Dspring.profiles.active=dev", "-jar", "/my-app.jar"]

now simply run: make docker-build

make sure that the makefile has tabular spaces