Dockerfile

# Copyright (c) 2024 Oracle and/or its affiliates.
#
# Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl.
#
# ORACLE DOCKERFILES PROJECT
# --------------------------
# This is the Dockerfile for Oracle JDK 8 on Oracle Linux 7
#
# REQUIRED FILES TO BUILD THIS IMAGE
# ----------------------------------
#
# (1) jdk-8uXX-linux-x64.tar.gz or jdk-8uXX-linux-aarch64.tar.gz
#     Download from https://www.oracle.com/java/technologies/downloads/#java8
#
# HOW TO BUILD THIS IMAGE
# -----------------------
# Put the downloaded file in the same directory as this Dockerfile
# Run:
#      $ docker build -t oracle/jdk:8 .
#
# This command is already scripted in build.sh so you can alternatively run
#      $ bash build.sh
#
# The builder image will be used to uncompress the tar.gz file with the Java Runtime.

FROM oraclelinux:7-slim AS builder

LABEL maintainer="Aurelio Garcia-Ribeyro <aurelio.garciaribeyro@oracle.com>"

# Since the file is compressed as tar.gz, first install gzip and tar
RUN yum install -y gzip tar

# Default to UTF-8 file.encoding
ENV LANG=en_US.UTF-8

# Environment variables for the builder image.
# Required to validate that you are using the correct file
ENV JAVA_HOME=/usr/java/jdk-8

# Copy the JDK tar.gz file
COPY jdk-8u*.tar.gz /tmp/
SHELL ["/bin/bash", "-o", "pipefail", "-c"]

RUN set -eux; \
    ARCH="$(uname -m)"; \
    if [ "$ARCH" = "x86_64" ]; then \
        mv "$(ls /tmp/jdk-8*-linux-x64.tar.gz)" /tmp/jdk.tar.gz; \
        JAVA_SHA256=b396978a716b7d23ccccabfe5c47c3b75d2434d7f8f7af690bc648172382720d; \
    else \
        mv "$(ls /tmp/jdk-8*-linux-aarch64.tar.gz)" /tmp/jdk.tar.gz; \
        JAVA_SHA256=e68d3e31ffcf7f05a4de65d04974843073bdff238bb6524adb272de9e616be7c; \
    fi; \
    echo "$JAVA_SHA256 */tmp/jdk.tar.gz" | sha256sum -c -; \
    mkdir -p "$JAVA_HOME"; \
    tar --extract --file /tmp/jdk.tar.gz --directory "$JAVA_HOME" --strip-components 1;

## Get a fresh version of Oracle Linux 7-slim for the final image
FROM oraclelinux:7-slim

# Default to UTF-8 file.encoding
ENV LANG=en_US.UTF-8

# Set environment variables for Java
ENV JAVA_HOME=/usr/java/jdk-8
ENV PATH=$JAVA_HOME/bin:$PATH

# Copy the uncompressed Java Runtime from the builder image
COPY --from=builder $JAVA_HOME $JAVA_HOME

# Perform system updates and set up Java alternatives
RUN yum -y update; \
    rm -rf /var/cache/yum; \
    ln -sfT "$JAVA_HOME" /usr/java/default; \
    ln -sfT "$JAVA_HOME" /usr/java/latest; \
    for bin in "$JAVA_HOME/bin/"*; do \
        base="$(basename "$bin")"; \
        [ ! -e "/usr/bin/$base" ] && alternatives --install "/usr/bin/$base" "$base" "$bin" 20000; \
    done; \
# -Xshare:dump will create a CDS archive to improve startup in subsequent runs
# The file will be stored as /usr/java/jdk-8/jre/lib/amd64/server/classes.jsa
# See https://docs.oracle.com/javase/8/docs/technotes/guides/vm/class-data-sharing.html
    java -Xshare:dump;