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When I try to build this Docker-Image, I get the following error:

Log

FROM java:8 WORKDIR /app ADD . /app EXPOSE 8080 RUN ./gradlew build CMD ./gradlew bootRun

When I just build the app with "gradlew build" it runs and when I try to run this Docker Image with a Mac, it works too, just not for windows

EDIT:

RUN ls Image

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  • No such file or directory... You need to actually copy over the gradlew shell script Commented May 29, 2018 at 12:52
  • can you elaborate on this a bit further? Commented May 29, 2018 at 12:53
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    Please show the content of the build directory in windows. Add a RUN ls step before the Gradle commands... My point is that ADD . /app did not actually ADD an executable file named ./gradlew, as the error says Commented May 29, 2018 at 12:57
  • edited it into the post Commented May 29, 2018 at 13:02
  • Hmm... Okay. Anyway, this not really a "proper" way to run a Java app. You typically build a JAR outside of the container, then copy it in and just run that Commented May 29, 2018 at 13:07

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This is not a great answer, but what I found is that when Windows mounts files into Docker from Windows, it leaves Windows-like line endings on the mounted files. A janky way to solve it in your Dockerfile would be to install dos2unix in the container and add a

RUN dos2unix gradlew

prior to executing your build process. Unfortunately, this is a TERRIBLE solution. Hopefully Docker for Windows on WSL2 that is supposed to release soon will solve this better but for now you are stuck with this janky solution.

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gradlew must be marked as executable.

chmod +x gradlew

Mac and Linux share permissions scheme but Windows needs to use a virtual FS so it copies files with default permissions - 644 and you need 755.

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Worked for me, adding in the dockerfile, before RUN ./gradlew lib:build:

RUN apt-get update && \ apt-get install dos2unix && \ apt-get clean RUN dos2unix gradlew RUN chmod +x gradlew RUN ./gradlew lib:build
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