Setup all the Java versions Elastic Search needs to compile

setup_elastic_search_java.sh

#!/bin/bash


# desired java versions
JAVA_VERSION_11=11.0.1-open
JAVA_VERSION_10=10.0.2-open
JAVA_VERSION_9=9.0.4-open
JAVA_VERSION_8=8.0.192-zulu


# determine if this program is being sourced
skip=false
[[ $- == *i* ]] || skip=true
[[ interactive ]] || skip=true
[[ ! `shopt -q login_shell` ]] || skip=true

if [[ $skip == true ]]; then
  echo "This file needs to be run with sourced"
  echo "so that sdkman can be found. e.g:"
  echo "   source setup_elastic_search_java.sh"
  exit 1
fi


# installing java versions
if [[ $1 == '--skip-install' ]]; then
  echo "Skipping installation"
else
  echo "Install Java ${JAVA_VERSION_11}"
  sdk install java $JAVA_VERSION_11

  echo "Install Java ${JAVA_VERSION_10}"
  sdk install java $JAVA_VERSION_10

  echo "Install Java ${JAVA_VERSION_9}"
  sdk install java $JAVA_VERSION_9

  echo "Install Java ${JAVA_VERSION_8}"
  sdk install java $JAVA_VERSION_8
fi


# reading all the java version installation paths
JAVA_HOME_11="$HOME/.sdkman/candidates/java/${JAVA_VERSION_11}"
echo "JAVA_HOME_11='${JAVA_HOME_11}'"

JAVA_HOME_10="$HOME/.sdkman/candidates/java/${JAVA_VERSION_10}"
echo "JAVA_HOME_10='${JAVA_HOME_10}'"

JAVA_HOME_9="$HOME/.sdkman/candidates/java/${JAVA_VERSION_9}"
echo "JAVA_HOME_9='${JAVA_HOME_9}'"

JAVA_HOME_8="$HOME/.sdkman/candidates/java/${JAVA_VERSION_8}"
echo "JAVA_HOME_8='${JAVA_HOME_8}'"


# generate java variable setup script
cat > /tmp/elastic-search-java-vars <<EOL
export JAVA_HOME=${JAVA_HOME_11}
export JAVA10_HOME=${JAVA_HOME_10}
export JAVA9_HOME=${JAVA_HOME_9}
export JAVA8_HOME=${JAVA_HOME_8}
export RUNTIME_JAVA_HOME=${JAVA_HOME_8}

sdk use java ${JAVA_VERSION_11}
EOL


# loading the java variables
source /tmp/elastic-search-java-vars