[SOLVED] Docker build: failed to fetch oauth token for openjdk?

Docker build: failed to fetch oauth token for openjdk?

I'm having trouble understanding this error when trying to build a project in Docker:

> [internal] load metadata for docker.io/library/openjdk:11:
------
failed to solve with frontend dockerfile.v0: failed to create LLB definition: failed to authorize: rpc error: code = Unknown desc = failed to fetch oauth token: unexpected status: 401 Unauthorized'

What does this error mean exactly? Am I missing permissions?

For reference, this is what my Dockerfile looks like:

### base jdk image ###
FROM openjdk:11 as setup
ENV USER sc_user
ENV HOME /home/$USER
ENV REPO $HOME/sc
RUN useradd -u 9999 $USER
COPY --chown=$USER build.gradle gradlew $REPO/
COPY --chown=$USER gradle $REPO/gradle
USER $USER
WORKDIR $REPO
RUN ./gradlew

FROM setup as tdd
ENTRYPOINT ["./gradlew", "-t", "test"]

FROM setup as debug-tdd
ENTRYPOINT ["./gradlew", "-t", "test", "-PjvmArgs=-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=*:5005"]

### build jar ###
FROM setup as build
COPY --chown=$USER src $REPO/src
RUN ./gradlew clean test build generatePomFileForMavenJavaPublication

Solution

It looks like you have BuildKit enabled in your docker configuration. BuildKit can cause these type of problems. Please try it again with BuildKit disabled.

In Linux, using environment variables:

export DOCKER_BUILDKIT=0
export COMPOSE_DOCKER_CLI_BUILD=0

In Windows and macOS, start the Docker Desktop application, go to Settings, select Docker Engine and look for the existing entry:

"buildkit": true

Change this entry to disable buildkit:

"buildkit": false

Then click on Apply & Restart and try it again.