Install Oracle JDK 8 for use with SDKMAN

sdkman_oracle_jdk.sh

#!/bin/bash
#
# Install Oracle JDK 8 for use with SDKMAN
#

set -eu

# This URL can be discovered using https://sites.google.com/view/java-se-download-url-converter
DOWNLOAD_URL="https://javadl.oracle.com/webapps/download/GetFile/1.8.0_331-b09/165374ff4ea84ef0bbd821706e29b123/linux-i586/jdk-8u331-linux-x64.tar.gz"
TARBALL="jdk-8u331-linux-x64.tar.gz"
DIRNAME="jdk1.8.0_331"
SDK_ID="8.0.331-oracle"

if [[ -z ${SDKMAN_DIR:-} ]]; then
  echo 'Error: ${SDKMAN_DIR} not defined'
  exit 1
fi

mkdir -p "$SDKMAN_DIR/candidates/java"
cd "$SDKMAN_DIR/candidates/java"

if [[ -e "$SDK_ID" ]]; then
  echo "$SDK_ID already installed"
  exit 0
fi

wget "$DOWNLOAD_URL" 
tar xvzf "$TARBALL"
mv -f "$DIRNAME" "$SDK_ID"
rm -f "$TARBALL"

echo "$SDK_ID installed"