Error with docker compose

[Danikileitor]

When i try to compile using docker compose i always get the following error:

` => [springboot-app internal] load build definition from Dockerfile 0.1s
=> => transferring dockerfile: 247B 0.0s
=> [springboot-app internal] load metadata for docker.io/library/openjdk:20 1.0s
=> [springboot-app auth] library/openjdk:pull token for registry-1.docker.io 0.0s
=> [springboot-app internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [springboot-app internal] load build context 0.0s
=> => transferring context: 2B 0.0s
=> [springboot-app 1/2] FROM docker.io/library/openjdk:20@sha256:cbf26a2c1a9c347a907a5ceb2edad13dc0e9cc22464cef5 0.0s
=> => resolve docker.io/library/openjdk:20@sha256:cbf26a2c1a9c347a907a5ceb2edad13dc0e9cc22464cef5861ac6d278e7303 0.0s
=> ERROR [springboot-app 2/2] ADD backend/target/digimon-tcg-sim.jar /app/digimon-tcg-sim.jar 0.0s

[springboot-app 2/2] ADD backend/target/digimon-tcg-sim.jar /app/digimon-tcg-sim.jar:

---

failed to solve: failed to compute cache key: failed to calculate checksum of ref 80f35b5f-8bed-43cf-878e-d73e1ebd4f22::m5i2lxefb1lq2hdz0gwouphx7: "/backend/target/digimon-tcg-sim.jar": not found`

[alessandrostagni]

You need to build the jar by running mvn -B package --file backend/pom.xml