Docker Container scenarios to Start on Alpine Linux with OpenJDK 11: Java scenarios 1
I'm converting an old project and I've searched everywhere and can't find a clear answer... I tried several approaches but none seem to work. I've been struggling with this for a few days now and could really use some help. I'm having trouble getting my Docker container to start on Alpine Linux using OpenJDK 11. When I attempt to run the container, it exits immediately with the behavior message: `behavior: Unable to access jarfile /app/myapp.jar`. I've verified that the jar file exists in the specified path within the container, but it seems like there's a question with either the file permissions or the way the entrypoint is set up. Here's the relevant part of my `Dockerfile`: ```dockerfile FROM openjdk:11-jre-alpine COPY myapp.jar /app/myapp.jar WORKDIR /app ENTRYPOINT ["java", "-jar", "myapp.jar"] ``` When I run `docker build -t myapp .` and then `docker run myapp`, it builds successfully but fails to start the app. I've also checked the permissions on the jar file inside the container by running `docker run -it --entrypoint /bin/sh myapp` and executing `ls -l /app`, which shows: ```shell -rw-r--r-- 1 root root 1234567 Oct 10 10:00 myapp.jar ``` This indicates that the file is readable, so I suspect there might be an scenario with how Alpine handles execution or possibly a missing dependency. I've tried switching the base image to `openjdk:11-jre` instead of the Alpine version, and it worked fine, but I prefer to stick with Alpine for its smaller size. Any insights on how to troubleshoot this further, or what could be causing the `Unable to access jarfile` behavior in this environment? My development environment is macOS. Thanks in advance! What am I doing wrong? I'm working with Dockerfile in a Docker container on Ubuntu 20.04. I'd be grateful for any help. I'm working with Dockerfile in a Docker container on Ubuntu 20.04. What are your experiences with this?