Create getJDK.sh to download the non-Jigsaw JDK 9

getJDK.sh

@@ -0,0 +1,107 @@
+#!/bin/bash
+
+set -eu
+
+# Binary name and download path composed with these values and current version
+JDK_NAME_GENERIC="jdk-9-ea+"
+JDK_NAME_LINUX="_linux-x64_bin.tar.gz"
+JDK_NAME_OSX="_osx-x64_bin.dmg"
+
+JDK_DESTINATION=$(echo ```pwd```)
+JDK_FOLDER_NAME="jdk-9"
+JDK_HOME_OS_SPECIFIC="$JDK_DESTINATION/$JDK_FOLDER_NAME"
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+	JDK_DESTINATION="/Library/Java/JavaVirtualMachines"
+fi
+
+JDK_DOWNLOAD_HOME_PAGE="http://jdk.java.net/9/"
+BUILD_NUMBER=$(curl $JDK_DOWNLOAD_HOME_PAGE/ | grep "Most recent build" | awk '{print $4}' |  tr -d "</h2>" | perl -nle 'print$& if m{jdk\-9\+\K\w+}')
+JDK_DOWNLOAD_BASE_URL="http://download.java.net/"
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  JDK_TAR_FILE_NAME=$JDK_NAME_GENERIC$BUILD_NUMBER$JDK_NAME_OSX
+	JDK_FOLDER_NAME="$JDK_FOLDER_NAME.jdk"
+	JDK_HOME_OS_SPECIFIC="$JDK_DESTINATION/$JDK_FOLDER_NAME/Contents/Home"
+else
+  JDK_TAR_FILE_NAME=$JDK_NAME_GENERIC$BUILD_NUMBER$JDK_NAME_LINUX
+fi
+
+JDK_HOME_OS_SPECIFIC_BIN="$JDK_HOME_OS_SPECIFIC/bin"
+
+function checkIfJDKIsDownloaded() {
+	echo ""
+	echo "Checking if the  JDK has already been downloaded..."
+	if [ ! -f "$JDK_TAR_FILE_NAME" ]; then
+		echo "No JDK does not exist, downloading now..."
+	    wget --no-check-certificate --header "Cookie: oraclelicense=accept-securebackup-cookie" -O $JDK_TAR_FILE_NAME "${JDK_DOWNLOAD_BASE_URL}/java/jdk9/archive/${BUILD_NUMBER}/binaries/${JDK_TAR_FILE_NAME}"
+  else
+    echo -e "The JDK ($JDK_TAR_FILE_NAME) has already been downloaded."
+  fi
+}
+
+function checkIfJDKIsInstalled() {
+	echo ""
+	echo "Checking if the JDK has already been installed..."
+
+	if [[ "$OSTYPE" == "darwin"* ]]; then
+		echo "Since you are using Mac OS X/macOS, .tar.gz files are not provided anymore."
+		echo "Please mount ${JDK_TAR_FILE_NAME} on Finder and install JDK 9. It will be installed at ${JDK_DESTINATION}/${JDK_FOLDER_NAME}."
+		return
+	fi
+
+	if [ ! -d "$JDK_HOME_OS_SPECIFIC" ]; then
+		echo "Unpacking the JDK..."
+		tar xzvf $JDK_TAR_FILE_NAME
+		echo ""
+		echo "Installing the JDK into $JDK_HOME_OS_SPECIFIC."
+	else
+		echo -e "The JDK ($JDK_FOLDER_NAME) has already been installed at $JDK_DESTINATION."
+	fi
+}
+
+function checkIf_JAVA_HOME_IsSet() {
+	JAVA_HOME_IS_SET=$(echo `echo $JAVA_HOME | grep "$JDK_HOME_OS_SPECIFIC"`)
+	echo ""
+	if [ -z $JAVA_HOME_IS_SET ]; then
+		echo -e "JAVA_HOME does not point at $JDK_HOME_OS_SPECIFIC"
+		echo -e "Please make it points at $JDK_HOME_OS_SPECIFIC with the below command:"
+		echo ""
+		echo -e "         export JAVA_HOME=$JDK_HOME_OS_SPECIFIC"
+		echo ""
+		echo "If needed add this to your .bashrc or .bash_profile settings."
+	else
+		echo -e "JAVA_HOME points at $JAVA_HOME"
+	fi
+}
+
+function checkIf_PATH_IsSet() {
+	PATH_IS_SET=$(echo `echo $PATH | grep "$JDK_HOME_OS_SPECIFIC_BIN"`)
+	echo ""
+	if [ -z $PATH_IS_SET ]; then
+		echo -e "PATH does not contain $JDK_HOME_OS_SPECIFIC_BIN"
+		echo -e "Please make it also point at it with the below command:"
+		echo ""
+		echo -e "         export PATH=$JDK_HOME_OS_SPECIFIC_BIN:\$PATH"
+		echo ""
+		echo "If needed add this to your .bashrc or .bash_profile settings."
+	else
+		echo -e "PATH contains $JDK_HOME_OS_SPECIFIC_BIN"
+	fi
+}
+
+function checkIfTheRightJava9CommandsAreBeingExecuted() {
+	echo ""
+	echo "Running javac with the -version option, to verify if the right JDK 9 commands are being executed."
+	javac -version
+
+	echo ""
+	echo "Running java with the -version option, to verify if the right JDK 9 commands are being executed."
+	java -version	
+}
+
+checkIfJDKIsDownloaded
+checkIfJDKIsInstalled
+checkIf_JAVA_HOME_IsSet
+checkIf_PATH_IsSet
+checkIfTheRightJava9CommandsAreBeingExecuted