8-jre-alpine CMD java not found

[artheus]

There seems to be a problem with the alpine images. At least there is for me.
I also tried the deprecated java:8-jre-alpine image and got the same result.

Dockerfile:

FROM openjdk:8-jre-alpine
ARG FINALNAME
ADD /$FINALNAME /$FINALNAME
CMD ["java", "-jar", $FINALNAME]

(Do not worry about the FINALNAME argument, that works as it should, my problem is the CMD line)

Run command:

artheus# docker run -it 106738dc2d2e
/bin/sh: [java,: not found

I have tried it with both docker 1.12 and 1.13.

I've tried running a container from my image specifying the command myself.

artheus# docker run -it 106738dc2d2e java -jre my-application-0.0.1-SNAPSHOT.jar
*** Runs perfectly ***

[artheus]

I also tried cleaning out the cache of images and containers on my machines completely, but the issue still persists.

[tianon]

The problem is your $FINALNAME argument -- ["java", "-jar", $FINALNAME] is not valid JSON, so it's passed to the shell as-is, and that's why your error message references [java, as the command that's not found (it's being passed to the shell). If you must have that final argument come from an environment variable, you'll have to switch to the shell syntax, although using exec can ensure that java still ends up being the only thing running:

CMD exec java -jar "$FINALNAME"