将 JRE 复制到 docker 并运行 java 命令的问题

Question

I am copying the working version of the JRE directory into docker and trying to run /JRE/bin/java. But it throws ash: java not found error. I am doing the same in a linux VM . Just copying the JRE folder and executing java command which works fine in VM. I don't want to download JRE from anywhere. Want this specific JRE bundled.How to resolve this.

I entered into the shell console and navigated to the JRE/bin/ directory and executed "java". even then it fails . The error is same ash: java not found error.

Dockerfile:

FROM alpine:latest

ENV HOME=/root \
        DEBIAN_FRONTEND=noninteractive \
        LANG=en_US.UTF-8 \
        LANGUAGE=en_US.UTF-8 \
        LC_ALL=C.UTF-8 \
        DISPLAY=:0.0 \
        DISPLAY_WIDTH=1024 \
        DISPLAY_HEIGHT=768

RUN apk --update --upgrade add \
        bash \
        fluxbox \
        x11vnc \
        xterm \
        xvfb

COPY MyJavaApp MyJavaApp/
WORKDIR /MyJavaApp
ENV PATH="./JRE/bin:${PATH}"

Answer 1

When are you copying the JRE directory to the docker? ie Docker build time or after spinning up the Docker container?

Looks like you are correctly copying the local Java directory to the image, however the current location cannot access the java binaries, thus, make sure to set the PATH. It should be something like,

RUN export PATH=/JRE/bin:${PATH}

or pass the path to the ENV in the Dockerfile,

ENV PATH="/JRE/bin:${PATH}"