Docker alpine + oracle java: cannot find java

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I've been trying to create an alpine-based docker image with Oracle Java (rather than openjdk). I have been specifically asked to create our own image here.

This is the Dockerfile I've come up with:

FROM alpine:3.6

RUN apk add --no-cache curl wget

RUN mkdir /opt/ && \
    wget -c --header "Cookie: oraclelicense=accept-securebackup-cookie"\
    http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz && \
    tar xvf jdk-8u131-linux-x64.tar.gz -C /opt/ && \
    rm jdk-8u131-linux-x64.tar.gz && \
    ln -s /opt/jdk1.8.0_131 /opt/jdk

ENV JAVA_HOME /opt/jdk
ENV PATH $PATH:/opt/jdk/bin

RUN echo $JAVA_HOME && \
    echo $PATH

RUN which java
RUN java -version

There are some unnecessary commands (like echoing the JAVA_HOME dir) which were added to help with debugging, but now I'm stuck: RUN which java returns /opt/jdk/bin/java as expected, but RUN java -version returns /bin/sh: java: not found.

I've tried a few things, including symlinking the executable(s) into /usr/bin, to no avail.

What am I missing?

EDIT: Final output from docker is: The command '/bin/sh -c java -version' returned a non-zero code: 127

Final edit:

Thanks to diginoise for putting me on to MUSL vs libc. I found adding the following to my Dockerfile allowed me to build a working image:

RUN apk --no-cache add ca-certificates && \
wget -q -O /etc/apk/keys/sgerrand.rsa.pub https://raw.githubusercontent.com/sgerrand/alpine-pkg-glibc/master/sgerrand.rsa.pub && \
wget https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.25-r0/glibc-2.25-r0.apk && \
apk add glibc-2.25-r0.apk

Found at: https://github.com/sgerrand/alpine-pkg-glibc

dockerfile docker java
3 Answers

I found an answer that works finally. All is needed is just the GlibC; huge thanks to S. Gerrand, this is such a big help.

Here's how to get the old JDK 8 running in Alpine 1.13:

FROM alpine:3.13

RUN apk --no-progress --purge --no-cache upgrade \
&& apk --no-progress --purge --no-cache add --upgrade \
    curl \
    wget \
    openssh \
&& apk --no-progress --purge --no-cache upgrade \
&& rm -vrf /var/cache/apk/* \
&& curl --version

# Install vanilla GLibC: https://github.com/sgerrand/alpine-pkg-glibc
RUN curl -o /etc/apk/keys/sgerrand.rsa.pub https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub \
&& curl -LO https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.32-r0/glibc-2.32-r0.apk \
&& apk add glibc-2.32-r0.apk

RUN wget -c --header "Cookie: oraclelicense=accept-securebackup-cookie" \
        http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz \
  && tar xvf jdk-8u131-linux-x64.tar.gz -C /opt \
  && rm jdk-8u131-linux-x64.tar.gz \
  && ln -s /opt/jdk1.8.0_131 /opt/jdk

ENV JAVA_HOME /opt/jdk
ENV PATH $PATH:/opt/jdk/bin

RUN echo $JAVA_HOME && \
    echo $PATH

RUN which java
RUN java -version

ENTRYPOINT [ "java" ]

# To test run: docker run -t khalifahks/alpine-java -version
# docker export <container-id> | docker import - khalifahks/alpine-java:exported
# quick interative termnal: docker run -it --entrypoint=sh khalifahks/alpine-java sh
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