关于jd-gui启动报This program requires Java 1.8+的错误问题及解决方法

最近，在Mac使用上JD-GUI启动时，报了如下的错误：

ERROR launching 'JD-GUI'
No suitable Java version found on your system!
This program requires Java 1.8+
Make sure you install the required Java version.

解决方法：

在“访达”中，右击JD-GUI图标，点击“显示包内容”。

然后，打开“Contents/MacOS/universalJavaApplicationStub.sh”文件，使用以下内容替换，保存即可。

#!/bin/bash
##################################################################################
#                                                                                #
# universalJavaApplicationStub                                                   #
#                                                                                #
# A BASH based JavaApplicationStub for Java Apps on Mac OS X                     #
# that works with both Apple's and Oracle's plist format.                        #
#                                                                                #
# Inspired by Ian Roberts stackoverflow answer                                   #
# at http://stackoverflow.com/a/17546508/1128689                                 #
#                                                                                #
# @author    Tobias Fischer                                                      #
# @url       https://github.com/tofi86/universalJavaApplicationStub              #
# @date      2020-03-19                                                          #
# @version   3.0.6                                                               #
#                                                                                #
##################################################################################
#                                                                                #
# The MIT License (MIT)                                                          #
#                                                                                #
# Copyright (c) 2014-2020 Tobias Fischer                                         #
#                                                                                #
# Permission is hereby granted, free of charge, to any person obtaining a copy   #
# of this software and associated documentation files (the "Software"), to deal  #
# in the Software without restriction, including without limitation the rights   #
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell      #
# copies of the Software, and to permit persons to whom the Software is          #
# furnished to do so, subject to the following conditions:                       #
#                                                                                #
# The above copyright notice and this permission notice shall be included in all #
# copies or substantial portions of the Software.                                #
#                                                                                #
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR     #
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,       #
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE    #
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER         #
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,  #
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE  #
# SOFTWARE.                                                                      #
#                                                                                #
##################################################################################

# function 'stub_logger()'
#
# A logger which logs to the macOS Console.app using the 'syslog' command
#
# @param1  the log message
# @return  void
################################################################################
function stub_logger() {
    syslog -s -k \
        Facility com.apple.console \
        Level Notice \
        Sender "$(basename "$0")" \
        Message "[$$][${CFBundleName:-$(basename "$0")}] $1"
}

# set the directory abspath of the current
# shell script with symlinks being resolved
############################################

PRG=$0
while [ -h "$PRG" ]; do
    ls=$(ls -ld "$PRG")
    link=$(expr "$ls" : '^.*-> \(.*\)$' 2>/dev/null)
    if expr "$link" : '^/' 2> /dev/null >/dev/null; then
        PRG="$link"
    else
        PRG="$(dirname "$PRG")/$link"
    fi
done
PROGDIR=$(dirname "$PRG")
stub_logger "[StubDir] $PROGDIR"

# set files and folders
############################################

# the absolute path of the app package
cd "$PROGDIR"/../../ || exit 11
AppPackageFolder=$(pwd)

# the base path of the app package
cd .. || exit 12
AppPackageRoot=$(pwd)

# set Apple's Java folder
AppleJavaFolder="${AppPackageFolder}"/Contents/Resources/Java

# set Apple's Resources folder
AppleResourcesFolder="${AppPackageFolder}"/Contents/Resources

# set Oracle's Java folder
OracleJavaFolder="${AppPackageFolder}"/Contents/Java

# set Oracle's Resources folder
OracleResourcesFolder="${AppPackageFolder}"/Contents/Resources

# set path to Info.plist in bundle
InfoPlistFile="${AppPackageFolder}"/Contents/Info.plist

# set the default JVM Version to a null string
JVMVersion=""
JVMMaxVersion=""

# function 'plist_get()'
#
# read a specific Plist key with 'PlistBuddy' utility
#
# @param1  the Plist key with leading colon ':'
# @return  the value as String or Array
################################################################################
plist_get(){
    /usr/libexec/PlistBuddy -c "print $1" "${InfoPlistFile}" 2> /dev/null
}

# function 'plist_get_java()'
#
# read a specific Plist key with 'PlistBuddy' utility
# in the 'Java' or 'JavaX' dictionary (<dict>)
#
# @param1  the Plist :Java(X):Key with leading colon ':'
# @return  the value as String or Array
################################################################################
plist_get_java(){
    plist_get ${JavaKey:-":Java"}$1
}

# read Info.plist and extract JVM options
############################################

# read the program name from CFBundleName
CFBundleName=$(plist_get ':CFBundleName')

# read the icon file name
CFBundleIconFile=$(plist_get ':CFBundleIconFile')

# check Info.plist for Apple style Java keys -> if key :Java is present, parse in apple mode
/usr/libexec/PlistBuddy -c "print :Java" "${InfoPlistFile}" > /dev/null 2>&1
exitcode=$?
JavaKey=":Java"

# if no :Java key is present, check Info.plist for universalJavaApplication style JavaX keys -> if key :JavaX is present, parse in apple mode
if [ $exitcode -ne 0 ]; then
    /usr/libexec/PlistBuddy -c "print :JavaX" "${InfoPlistFile}" > /dev/null 2>&1
    exitcode=$?
    JavaKey=":JavaX"
fi

# read 'Info.plist' file in Apple style if exit code returns 0 (true, ':Java' key is present)
if [ $exitcode -eq 0 ]; then
    stub_logger "[PlistStyle] Apple"

    # set Java and Resources folder
    JavaFolder="${AppleJavaFolder}"
    ResourcesFolder="${AppleResourcesFolder}"

    APP_PACKAGE="${AppPackageFolder}"
    JAVAROOT="${AppleJavaFolder}"
    USER_HOME="$HOME"

    # read the Java WorkingDirectory
    JVMWorkDir=$(plist_get_java ':WorkingDirectory' | xargs)
    # set Working Directory based upon PList value
    if [[ ! -z ${JVMWorkDir} ]]; then
        WorkingDirectory="${JVMWorkDir}"
    else
        # AppPackageRoot is the standard WorkingDirectory when the script is started
        WorkingDirectory="${AppPackageRoot}"
    fi
    # expand variables $APP_PACKAGE, $JAVAROOT, $USER_HOME
    WorkingDirectory=$(eval echo "${WorkingDirectory}")

    # read the MainClass name
    JVMMainClass="$(plist_get_java ':MainClass')"

    # read the SplashFile name
    JVMSplashFile=$(plist_get_java ':SplashFile')

    # read the JVM Properties as an array and retain spaces
    IFS=$'\t\n'
    JVMOptions=($(xargs -n1 <<<$(plist_get_java ':Properties' | grep " =" | sed 's/^ */-D/g' | sed -E 's/ = (.*)$/="\1"/g')))
    unset IFS
    # post processing of the array follows further below...

    # read the ClassPath in either Array or String style
    JVMClassPath_RAW=$(plist_get_java ':ClassPath' | xargs)
    if [[ $JVMClassPath_RAW == *Array* ]] ; then
        JVMClassPath=.$(plist_get_java ':ClassPath' | grep "    " | sed 's/^ */:/g' | tr -d '\n' | xargs)
    else
        JVMClassPath=${JVMClassPath_RAW}
    fi
    # expand variables $APP_PACKAGE, $JAVAROOT, $USER_HOME
    JVMClassPath=$(eval echo "${JVMClassPath}")

    # read the JVM Options in either Array or String style
    JVMDefaultOptions_RAW=$(plist_get_java ':VMOptions' | xargs)
    if [[ $JVMDefaultOptions_RAW == *Array* ]] ; then
        JVMDefaultOptions=$(plist_get_java ':VMOptions' | grep "    " | sed 's/^ */ /g' | tr -d '\n' | xargs)
    else
        JVMDefaultOptions=${JVMDefaultOptions_RAW}
    fi

    # read StartOnMainThread and add as -XstartOnFirstThread
    JVMStartOnMainThread=$(plist_get_java ':StartOnMainThread')
    if [ "${JVMStartOnMainThread}" == "true" ]; then
        JVMDefaultOptions+=" -XstartOnFirstThread"
    fi

    # read the JVM Arguments in either Array or String style (#76) and retain spaces
    IFS=$'\t\n'
    MainArgs_RAW=$(plist_get_java ':Arguments' | xargs)
    if [[ $MainArgs_RAW == *Array* ]] ; then
        MainArgs=($(xargs -n1 <<<$(plist_get_java ':Arguments' | tr -d '\n' | sed -E 's/Array \{ *(.*) *\}/\1/g' | sed 's/  */ /g')))
    else
        MainArgs=($(xargs -n1 <<<$(plist_get_java ':Arguments')))
    fi
    unset IFS
    # post processing of the array follows further below...

    # read the Java version we want to find
    JVMVersion=$(plist_get_java ':JVMVersion' | xargs)
    # post processing of the version string follows below...

# read 'Info.plist' file in Oracle style
else
    stub_logger "[PlistStyle] Oracle"

    # set Working Directory and Java and Resources folder
    JavaFolder="${OracleJavaFolder}"
    ResourcesFolder="${OracleResourcesFolder}"
    WorkingDirectory="${OracleJavaFolder}"

    APP_ROOT="${AppPackageFolder}"

    # read the MainClass name
    JVMMainClass="$(plist_get ':JVMMainClassName')"

    # read the SplashFile name
    JVMSplashFile=$(plist_get ':JVMSplashFile')

    # read the JVM Options as an array and retain spaces
    IFS=$'\t\n'
    JVMOptions=($(plist_get ':JVMOptions' | grep "    " | sed 's/^ *//g'))
    unset IFS
    # post processing of the array follows further below...

    # read the ClassPath in either Array or String style
    JVMClassPath_RAW=$(plist_get ':JVMClassPath')
    if [[ $JVMClassPath_RAW == *Array* ]] ; then
        JVMClassPath=.$(plist_get ':JVMClassPath' | grep "    " | sed 's/^ */:/g' | tr -d '\n' | xargs)
        # expand variables $APP_PACKAGE, $JAVAROOT, $USER_HOME
        JVMClassPath=$(eval echo "${JVMClassPath}")

    elif [[ ! -z ${JVMClassPath_RAW} ]] ; then
        JVMClassPath=${JVMClassPath_RAW}
        # expand variables $APP_PACKAGE, $JAVAROOT, $USER_HOME
        JVMClassPath=$(eval echo "${JVMClassPath}")

    else
        #default: fallback to OracleJavaFolder
        JVMClassPath="${JavaFolder}/*"
        # Do NOT expand the default 'AppName.app/Contents/Java/*' classpath (#42)
    fi

    # read the JVM Default Options
    JVMDefaultOptions=$(plist_get ':JVMDefaultOptions' | grep -o " \-.*" | tr -d '\n' | xargs)

    # read the Main Arguments from JVMArguments key as an array and retain spaces (see #46 for naming details)
    IFS=$'\t\n'
    MainArgs=($(xargs -n1 <<<$(plist_get ':JVMArguments' | tr -d '\n' | sed -E 's/Array \{ *(.*) *\}/\1/g' | sed 's/  */ /g')))
    unset IFS
    # post processing of the array follows further below...

    # read the Java version we want to find
    JVMVersion=$(plist_get ':JVMVersion' | xargs)
    # post processing of the version string follows below...
fi

# (#75) check for undefined icons or icon names without .icns extension and prepare
# an osascript statement for those cases when the icon can be shown in the dialog
DialogWithIcon=""
if [ ! -z ${CFBundleIconFile} ]; then
    if [[ ${CFBundleIconFile} == *.icns ]] && [[ -f "${ResourcesFolder}/${CFBundleIconFile}" ]] ; then
        DialogWithIcon=" with icon path to resource \"${CFBundleIconFile}\" in bundle (path to me)"
    elif [[ ${CFBundleIconFile} != *.icns ]] && [[ -f "${ResourcesFolder}/${CFBundleIconFile}.icns" ]] ; then
        CFBundleIconFile+=".icns"
        DialogWithIcon=" with icon path to resource \"${CFBundleIconFile}\" in bundle (path to me)"
    fi
fi

# JVMVersion: post processing and optional splitting
if [[ ${JVMVersion} == *";"* ]]; then
    minMaxArray=(${JVMVersion//;/ })
    JVMVersion=${minMaxArray[0]//+}
    JVMMaxVersion=${minMaxArray[1]//+}
fi
stub_logger "[JavaRequirement] JVM minimum version: ${JVMVersion}"
stub_logger "[JavaRequirement] JVM maximum version: ${JVMMaxVersion}"

# MainArgs: replace occurences of $APP_ROOT with its content
MainArgsArr=()
for i in "${MainArgs[@]}"
do
    MainArgsArr+=("$(eval echo "$i")")
done

# JVMOptions: replace occurences of $APP_ROOT with its content
JVMOptionsArr=()
for i in "${JVMOptions[@]}"
do
    JVMOptionsArr+=("$(eval echo "$i")")
done

# internationalized messages
############################################

LANG=$(defaults read -g AppleLocale)
stub_logger "[Language] $LANG"

# French localization
if [[ $LANG == fr* ]] ; then
    MSG_ERROR_LAUNCHING="ERREUR au lancement de '${CFBundleName}'."
    MSG_MISSING_MAINCLASS="'MainClass' n'est pas spécifié.\nL'application Java ne peut pas être lancée."
    MSG_JVMVERSION_REQ_INVALID="La syntaxe de la version de Java demandée est invalide: %s\nVeuillez contacter le développeur de l'application."
    MSG_NO_SUITABLE_JAVA="La version de Java installée sur votre système ne convient pas.\nCe programme nécessite Java %s"
    MSG_JAVA_VERSION_OR_LATER="ou ultérieur"
    MSG_JAVA_VERSION_LATEST="(dernière mise à jour)"
    MSG_JAVA_VERSION_MAX="à %s"
    MSG_NO_SUITABLE_JAVA_CHECK="Merci de bien vouloir installer la version de Java requise."
    MSG_INSTALL_JAVA="Java doit être installé sur votre système.\nRendez-vous sur java.com et suivez les instructions d'installation..."
    MSG_LATER="Plus tard"
    MSG_VISIT_JAVA_DOT_COM="Java by Oracle"
    MSG_VISIT_ADOPTOPENJDK="Java by AdoptOpenJDK"

# German localization
elif [[ $LANG == de* ]] ; then
    MSG_ERROR_LAUNCHING="FEHLER beim Starten von '${CFBundleName}'."
    MSG_MISSING_MAINCLASS="Die 'MainClass' ist nicht spezifiziert!\nDie Java-Anwendung kann nicht gestartet werden!"
    MSG_JVMVERSION_REQ_INVALID="Die Syntax der angeforderten Java-Version ist ungültig: %s\nBitte kontaktieren Sie den Entwickler der App."
    MSG_NO_SUITABLE_JAVA="Es wurde keine passende Java-Version auf Ihrem System gefunden!\nDieses Programm benötigt Java %s"
    MSG_JAVA_VERSION_OR_LATER="oder neuer"
    MSG_JAVA_VERSION_LATEST="(neuste Unterversion)"
    MSG_JAVA_VERSION_MAX="bis %s"
    MSG_NO_SUITABLE_JAVA_CHECK="Stellen Sie sicher, dass die angeforderte Java-Version installiert ist."
    MSG_INSTALL_JAVA="Auf Ihrem System muss die 'Java'-Software installiert sein.\nBesuchen Sie java.com für weitere Installationshinweise."
    MSG_LATER="Später"
    MSG_VISIT_JAVA_DOT_COM="Java von Oracle"
    MSG_VISIT_ADOPTOPENJDK="Java von AdoptOpenJDK"

# Simplifyed Chinese localization
elif [[ $LANG == zh* ]] ; then
    MSG_ERROR_LAUNCHING="无法启动 '${CFBundleName}'."
    MSG_MISSING_MAINCLASS="没有指定 'MainClass'！\nJava程序无法启动!"
    MSG_JVMVERSION_REQ_INVALID="Java版本参数语法错误: %s\n请联系该应用的开发者。"
    MSG_NO_SUITABLE_JAVA="没有在系统中找到合适的Java版本！\n必须安装Java %s才能够使用该程序！"
    MSG_JAVA_VERSION_OR_LATER="及以上版本"
    MSG_JAVA_VERSION_LATEST="(最新版本)"
    MSG_JAVA_VERSION_MAX="最高为 %s"
    MSG_NO_SUITABLE_JAVA_CHECK="请确保系统中安装了所需的Java版本"
    MSG_INSTALL_JAVA="你需要在Mac中安装Java运行环境！\n访问 java.com 了解如何安装。"
    MSG_LATER="稍后"
    MSG_VISIT_JAVA_DOT_COM="Java by Oracle"
    MSG_VISIT_ADOPTOPENJDK="Java by AdoptOpenJDK"

# English default localization
else
    MSG_ERROR_LAUNCHING="ERROR launching '${CFBundleName}'."
    MSG_MISSING_MAINCLASS="'MainClass' isn't specified!\nJava application cannot be started!"
    MSG_JVMVERSION_REQ_INVALID="The syntax of the required Java version is invalid: %s\nPlease contact the App developer."
    MSG_NO_SUITABLE_JAVA="No suitable Java version found on your system!\nThis program requires Java %s"
    MSG_JAVA_VERSION_OR_LATER="or later"
    MSG_JAVA_VERSION_LATEST="(latest update)"
    MSG_JAVA_VERSION_MAX="up to %s"
    MSG_NO_SUITABLE_JAVA_CHECK="Make sure you install the required Java version."
    MSG_INSTALL_JAVA="You need to have JAVA installed on your Mac!\nVisit java.com for installation instructions..."
    MSG_LATER="Later"
    MSG_VISIT_JAVA_DOT_COM="Java by Oracle"
    MSG_VISIT_ADOPTOPENJDK="Java by AdoptOpenJDK"
fi

# function 'get_java_version_from_cmd()'
#
# returns Java version string from 'java -version' command
# works for both old (1.8) and new (9) version schema
#
# @param1  path to a java JVM executable
# @return  the Java version number as displayed in 'java -version' command
################################################################################
function get_java_version_from_cmd() {
    # second sed command strips " and -ea from the version string
    echo $("$1" -version 2>&1 | awk '/version/{print $3}' | sed -E 's/"//g;s/-ea//g')
}

# function 'extract_java_major_version()'
#
# extract Java major version from a version string
#
# @param1  a Java version number ('1.8.0_45') or requirement string ('1.8+')
# @return  the major version (e.g. '7', '8' or '9', etc.)
################################################################################
function extract_java_major_version() {
    echo $(echo "$1" | sed -E 's/^1\.//;s/^([0-9]+)(-ea|(\.[0-9_.]{1,7})?)(-b[0-9]+-[0-9]+)?[+*]?$/\1/')
}

# function 'get_comparable_java_version()'
#
# return comparable version for a Java version number or requirement string
#
# @param1  a Java version number ('1.8.0_45') or requirement string ('1.8+')
# @return  an 8 digit numeral ('1.8.0_45'->'08000045'; '9.1.13'->'09001013')
################################################################################
function get_comparable_java_version() {
    # cleaning: 1) remove leading '1.'; 2) remove build string (e.g. '-b14-468'); 3) remove 'a-Z' and '-*+' (e.g. '-ea'); 4) replace '_' with '.'
    local cleaned=$(echo "$1" | sed -E 's/^1\.//g;s/-b[0-9]+-[0-9]+$//g;s/[a-zA-Z+*\-]//g;s/_/./g')
    # splitting at '.' into an array
    local arr=( ${cleaned//./ } )
    # echo a string with left padded version numbers
    echo "$(printf '%02s' ${arr[0]})$(printf '%03s' ${arr[1]})$(printf '%03s' ${arr[2]})"
}

# function 'is_valid_requirement_pattern()'
#
# check whether the Java requirement is a valid requirement pattern
#
# supported requirements are for example:
# - 1.6       requires Java 6 (any update)      [1.6, 1.6.0_45, 1.6.0_88]
# - 1.6*      requires Java 6 (any update)      [1.6, 1.6.0_45, 1.6.0_88]
# - 1.6+      requires Java 6 or higher         [1.6, 1.6.0_45, 1.8, 9, etc.]
# - 1.6.0     requires Java 6 (any update)      [1.6, 1.6.0_45, 1.6.0_88]
# - 1.6.0_45  requires Java 6u45                [1.6.0_45]
# - 1.6.0_45+ requires Java 6u45 or higher      [1.6.0_45, 1.6.0_88, 1.8, etc.]
# - 9         requires Java 9 (any update)      [9.0.*, 9.1, 9.3, etc.]
# - 9*        requires Java 9 (any update)      [9.0.*, 9.1, 9.3, etc.]
# - 9+        requires Java 9 or higher         [9.0, 9.1, 10, etc.]
# - 9.1       requires Java 9.1 (any update)    [9.1.*, 9.1.2, 9.1.13, etc.]
# - 9.1*      requires Java 9.1 (any update)    [9.1.*, 9.1.2, 9.1.13, etc.]
# - 9.1+      requires Java 9.1 or higher       [9.1, 9.2, 10, etc.]
# - 9.1.3     requires Java 9.1.3               [9.1.3]
# - 9.1.3*    requires Java 9.1.3 (any update)  [9.1.3]
# - 9.1.3+    requires Java 9.1.3 or higher     [9.1.3, 9.1.4, 9.2.*, 10, etc.]
# - 10-ea     requires Java 10 (early access release)
#
# unsupported requirement patterns are for example:
# - 1.2, 1.3, 1.9       Java 2, 3 are not supported
# - 1.9                 Java 9 introduced a new versioning scheme
# - 6u45                known versioning syntax, but unsupported
# - 9-ea*, 9-ea+        early access releases paired with */+
# - 9., 9.*, 9.+        version ending with a .
# - 9.1., 9.1.*, 9.1.+  version ending with a .
# - 9.3.5.6             4 part version number is unsupported
#
# @param1  a Java requirement string ('1.8+')
# @return  boolean exit code: 0 (is valid), 1 (is not valid)
################################################################################
function is_valid_requirement_pattern() {
    local java_req=$1
    java8pattern='1\.[4-8](\.[0-9]+)?(\.0_[0-9]+)?[*+]?'
    java9pattern='(9|1[0-9])(-ea|[*+]|(\.[0-9]+){1,2}[*+]?)?'
    # test matches either old Java versioning scheme (up to 1.8) or new scheme (starting with 9)
    if [[ ${java_req} =~ ^(${java8pattern}|${java9pattern})$ ]]; then
        return 0
    else
        return 1
    fi
}

# determine which JVM to use
############################################

# default Apple JRE plugin path (< 1.6)
apple_jre_plugin="/Library/Java/Home/bin/java"
apple_jre_version=$(get_java_version_from_cmd "${apple_jre_plugin}")
# default Oracle JRE plugin path (>= 1.7)
oracle_jre_plugin="/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java"
oracle_jre_version=$(get_java_version_from_cmd "${oracle_jre_plugin}")

# first check system variable "$JAVA_HOME" -> has precedence over any other System JVM
stub_logger '[JavaSearch] Checking for $JAVA_HOME ...'
if [ -n "$JAVA_HOME" ] ; then
    stub_logger "[JavaSearch] ... found JAVA_HOME with value $JAVA_HOME"

    # PR 26: Allow specifying "$JAVA_HOME" relative to "$AppPackageFolder"
    # which allows for bundling a custom version of Java inside your app!
    if [[ $JAVA_HOME == /* ]] ; then
        # if "$JAVA_HOME" starts with a Slash it's an absolute path
        JAVACMD="$JAVA_HOME/bin/java"
    else
        # otherwise it's a relative path to "$AppPackageFolder"
        JAVACMD="$AppPackageFolder/$JAVA_HOME/bin/java"
    fi
    JAVACMD_version=$(get_comparable_java_version $(get_java_version_from_cmd "${JAVACMD}"))
else
    stub_logger "[JavaSearch] ... didn't found JAVA_HOME"
fi

# check for any other or a specific Java version
# also if $JAVA_HOME exists but isn't executable
if [ -z "${JAVACMD}" ] || [ ! -x "${JAVACMD}" ] ; then
    stub_logger "[JavaSearch] Checking for JavaVirtualMachines on the system ..."
    # reset variables
    JAVACMD=""
    JAVACMD_version=""

    # first check whether JVMVersion string is a valid requirement string
    if [ ! -z "${JVMVersion}" ] && ! is_valid_requirement_pattern ${JVMVersion} ; then
        MSG_JVMVERSION_REQ_INVALID_EXPANDED=$(printf "${MSG_JVMVERSION_REQ_INVALID}" "${JVMVersion}")
        # log exit cause
        stub_logger "[EXIT 4] ${MSG_JVMVERSION_REQ_INVALID_EXPANDED}"
        # display error message with AppleScript
        osascript -e "tell application \"System Events\" to display dialog \"${MSG_ERROR_LAUNCHING}\n\n${MSG_JVMVERSION_REQ_INVALID_EXPANDED}\" with title \"${CFBundleName}\" buttons {\" OK \"} default button 1${DialogWithIcon}"
        # exit with error
        exit 4
    fi
    # then check whether JVMMaxVersion string is a valid requirement string
    if [ ! -z "${JVMMaxVersion}" ] && ! is_valid_requirement_pattern ${JVMMaxVersion} ; then
        MSG_JVMVERSION_REQ_INVALID_EXPANDED=$(printf "${MSG_JVMVERSION_REQ_INVALID}" "${JVMMaxVersion}")
        # log exit cause
        stub_logger "[EXIT 5] ${MSG_JVMVERSION_REQ_INVALID_EXPANDED}"
        # display error message with AppleScript
        osascript -e "tell application \"System Events\" to display dialog \"${MSG_ERROR_LAUNCHING}\n\n${MSG_JVMVERSION_REQ_INVALID_EXPANDED}\" with title \"${CFBundleName}\" buttons {\" OK \"} default button 1${DialogWithIcon}"
        # exit with error
        exit 5
    fi

    # find installed JavaVirtualMachines (JDK + JRE)
    allJVMs=()
    # read JDK's from '/usr/libexec/java_home -V' command
    while read -r line; do
        version=$(echo $line | awk -F $',' '{print $1;}')
        path=$(echo $line | awk -F $'" ' '{print $2;}')
        path+="/bin/java"
        allJVMs+=("$version:$path")
    done < <(/usr/libexec/java_home -V 2>&1 | grep '^[[:space:]]')
    # unset while loop variables
    unset version path

    # add Apple JRE if available
    if [ -x "${apple_jre_plugin}" ] ; then
        allJVMs+=("$apple_jre_version:$apple_jre_plugin")
    fi

    # add Oracle JRE if available
    if [ -x "${oracle_jre_plugin}" ] ; then
        allJVMs+=("$oracle_jre_version:$oracle_jre_plugin")
    fi

    # debug output
    for i in "${allJVMs[@]}"
    do
        stub_logger "[JavaSearch] ... found JVM: $i"
    done

    # determine JVMs matching the min/max version requirement
    minC=$(get_comparable_java_version ${JVMVersion})
    maxC=$(get_comparable_java_version ${JVMMaxVersion})
    matchingJVMs=()

    for i in "${allJVMs[@]}"
    do
        # split JVM string at ':' delimiter to retain spaces in $path substring
        IFS=: arr=($i) ; unset IFS
        # [0] JVM version number
        ver=${arr[0]}
        # comparable JVM version number
        comp=$(get_comparable_java_version $ver)
        # [1] JVM path
        path="${arr[1]}"
        # construct string item for adding to the "matchingJVMs" array
        item="$comp:$ver:$path"

        # pre-requisite: current version number needs to be greater than min version number
        if [ "$comp" -ge "$minC" ] ; then

            # perform max version checks if max version requirement is present
            if [ ! -z ${JVMMaxVersion} ] ; then

                # max version requirement ends with '*' modifier
                if [[ ${JVMMaxVersion} == *\* ]] ; then

                    # use the '*' modifier from the max version string as wildcard for a 'starts with' comparison
                    # and check whether the current version number starts with the max version wildcard string
                    if [[ ${ver} == ${JVMMaxVersion} ]]; then
                        matchingJVMs+=("$item")

                    # or whether the current comparable version is lower than the comparable max version
                    elif [ "$comp" -le "$maxC" ] ; then
                        matchingJVMs+=("$item")
                    fi

                # max version requirement ends with '+' modifier -> always add this version if it's greater than $min
                # because a max requirement with + modifier doesn't make sense
                elif [[ ${JVMMaxVersion} == *+ ]] ; then
                    matchingJVMs+=("$item")

                # matches 6 zeros at the end of the max version string (e.g. for 1.8, 9)
                # -> then the max version string should be treated like with a '*' modifier at the end
                #elif [[ ${maxC} =~ ^[0-9]{2}0{6}$ ]] && [ "$comp" -le $(( ${maxC#0} + 999 )) ] ; then
                #    matchingJVMs+=("$item")

                # matches 3 zeros at the end of the max version string (e.g. for 9.1, 10.3)
                # -> then the max version string should be treated like with a '*' modifier at the end
                #elif [[ ${maxC} =~ ^[0-9]{5}0{3}$ ]] && [ "$comp" -le "${maxC}" ] ; then
                #    matchingJVMs+=("$item")

                # matches standard requirements without modifier
                elif [ "$comp" -le "$maxC" ]; then
                    matchingJVMs+=("$item")
                fi

            # no max version requirement:

            # min version requirement ends with '+' modifier
            # -> always add the current version because it's greater than $min
            elif [[ ${JVMVersion} == *+ ]] ; then
                matchingJVMs+=("$item")

            # min version requirement ends with '*' modifier
            # -> use the '*' modifier from the min version string as wildcard for a 'starts with' comparison
            #    and check whether the current version number starts with the min version wildcard string
            elif [[ ${JVMVersion} == *\* ]] ; then
                if [[ ${ver} == ${JVMVersion} ]] ; then
                    matchingJVMs+=("$item")
                fi

            # compare the min version against the current version with an additional * wildcard for a 'starts with' comparison
            # -> e.g. add 1.8.0_44 when the requirement is 1.8
            elif [[ ${ver} == ${JVMVersion}* ]] ; then
                    matchingJVMs+=("$item")
            fi
        fi
    done
    # unset for loop variables
    unset arr ver comp path item

    # debug output
    for i in "${matchingJVMs[@]}"
    do
        stub_logger "[JavaSearch] ... ... matches all requirements: $i"
    done

    # sort the matching JavaVirtualMachines by version number
    # https://stackoverflow.com/a/11789688/1128689
    IFS=$'\n' matchingJVMs=($(sort -nr <<<"${matchingJVMs[*]}"))
    unset IFS

    # get the highest matching JVM
    for ((i = 0; i < ${#matchingJVMs[@]}; i++));
    do
        # split JVM string at ':' delimiter to retain spaces in $path substring
        IFS=: arr=(${matchingJVMs[$i]}) ; unset IFS
        # [0] comparable JVM version number
        comp=${arr[0]}
        # [1] JVM version number
        ver=${arr[1]}
        # [2] JVM path
        path="${arr[2]}"

        # use current value as JAVACMD if it's executable
        if [ -x "$path" ] ; then
            JAVACMD="$path"
            JAVACMD_version=$comp
            break
        fi
    done
    # unset for loop variables
    unset arr comp ver path
fi

# log the Java Command and the extracted version number
stub_logger "[JavaCommand] '$JAVACMD'"
stub_logger "[JavaVersion] $(get_java_version_from_cmd "${JAVACMD}")${JAVACMD_version:+ / $JAVACMD_version}"

if [ -z "${JAVACMD}" ] || [ ! -x "${JAVACMD}" ] ; then

    # different error messages when a specific JVM was required
    if [ ! -z "${JVMVersion}" ] ; then
        # display human readable java version (#28)
        java_version_hr=$(echo ${JVMVersion} | sed -E 's/^1\.([0-9+*]+)$/ \1/g' | sed "s/+/ ${MSG_JAVA_VERSION_OR_LATER}/;s/*/ ${MSG_JAVA_VERSION_LATEST}/")
        MSG_NO_SUITABLE_JAVA_EXPANDED=$(printf "${MSG_NO_SUITABLE_JAVA}" "${java_version_hr}").

        if [ ! -z "${JVMMaxVersion}" ] ; then
            java_version_hr=$(extract_java_major_version ${JVMVersion})
            java_version_max_hr=$(echo ${JVMMaxVersion} | sed -E 's/^1\.([0-9+*]+)$/ \1/g' | sed "s/+//;s/*/ ${MSG_JAVA_VERSION_LATEST}/")
            MSG_NO_SUITABLE_JAVA_EXPANDED="$(printf "${MSG_NO_SUITABLE_JAVA}" "${java_version_hr}") $(printf "${MSG_JAVA_VERSION_MAX}" "${java_version_max_hr}")"
        fi

        # log exit cause
        stub_logger "[EXIT 3] ${MSG_NO_SUITABLE_JAVA_EXPANDED}"

        # display error message with AppleScript
        osascript -e "tell application \"System Events\" to display dialog \"${MSG_ERROR_LAUNCHING}\n\n${MSG_NO_SUITABLE_JAVA_EXPANDED}\n${MSG_NO_SUITABLE_JAVA_CHECK}\" with title \"${CFBundleName}\"  buttons {\" OK \", \"${MSG_VISIT_JAVA_DOT_COM}\", \"${MSG_VISIT_ADOPTOPENJDK}\"} default button 1${DialogWithIcon}" \
                -e "set response to button returned of the result" \
                -e "if response is \"${MSG_VISIT_JAVA_DOT_COM}\" then open location \"https://www.java.com/download/\"" \
                -e "if response is \"${MSG_VISIT_ADOPTOPENJDK}\" then open location \"https://adoptopenjdk.net/releases.html\""
        # exit with error
        exit 3

    else
        # log exit cause
        stub_logger "[EXIT 1] ${MSG_ERROR_LAUNCHING}"
        # display error message with AppleScript
        osascript -e "tell application \"System Events\" to display dialog \"${MSG_ERROR_LAUNCHING}\n\n${MSG_INSTALL_JAVA}\" with title \"${CFBundleName}\" buttons {\"${MSG_LATER}\", \"${MSG_VISIT_JAVA_DOT_COM}\", \"${MSG_VISIT_ADOPTOPENJDK}\"} default button 1${DialogWithIcon}" \
                    -e "set response to button returned of the result" \
                    -e "if response is \"${MSG_VISIT_JAVA_DOT_COM}\" then open location \"https://www.java.com/download/\"" \
                    -e "if response is \"${MSG_VISIT_ADOPTOPENJDK}\" then open location \"https://adoptopenjdk.net/releases.html\""
        # exit with error
        exit 1
    fi
fi

# MainClass check
############################################

if [ -z "${JVMMainClass}" ]; then
    # log exit cause
    stub_logger "[EXIT 2] ${MSG_MISSING_MAINCLASS}"
    # display error message with AppleScript
    osascript -e "tell application \"System Events\" to display dialog \"${MSG_ERROR_LAUNCHING}\n\n${MSG_MISSING_MAINCLASS}\" with title \"${CFBundleName}\" buttons {\" OK \"} default button 1${DialogWithIcon}"
    # exit with error
    exit 2
fi

# execute $JAVACMD and do some preparation
############################################

# enable drag&drop to the dock icon
export CFProcessPath="$0"

# remove Apples ProcessSerialNumber from passthru arguments (#39)
if [[ "$*" == -psn* ]] ; then
    ArgsPassthru=()
else
    ArgsPassthru=("$@")
fi

# change to Working Directory based upon Apple/Oracle Plist info
cd "${WorkingDirectory}" || exit 13
stub_logger "[WorkingDirectory] ${WorkingDirectory}"

# execute Java and set
# - classpath
# - splash image
# - dock icon
# - app name
# - JVM options / properties (-D)
# - JVM default options (-X)
# - main class
# - main class arguments
# - passthrough arguments from Terminal or Drag'n'Drop to Finder icon
stub_logger "[Exec] \"$JAVACMD\" -cp \"${JVMClassPath}\" -splash:\"${ResourcesFolder}/${JVMSplashFile}\" -Xdock:icon=\"${ResourcesFolder}/${CFBundleIconFile}\" -Xdock:name=\"${CFBundleName}\" ${JVMOptionsArr:+$(printf "'%s' " "${JVMOptionsArr[@]}") }${JVMDefaultOptions:+$JVMDefaultOptions }${JVMMainClass}${MainArgsArr:+ $(printf "'%s' " "${MainArgsArr[@]}")}${ArgsPassthru:+ $(printf "'%s' " "${ArgsPassthru[@]}")}"
exec "${JAVACMD}" \
        -cp "${JVMClassPath}" \
        -splash:"${ResourcesFolder}/${JVMSplashFile}" \
        -Xdock:icon="${ResourcesFolder}/${CFBundleIconFile}" \
        -Xdock:name="${CFBundleName}" \
        ${JVMOptionsArr:+"${JVMOptionsArr[@]}" }\
        ${JVMDefaultOptions:+$JVMDefaultOptions }\
        "${JVMMainClass}"\
        ${MainArgsArr:+ "${MainArgsArr[@]}"}\
        ${ArgsPassthru:+ "${ArgsPassthru[@]}"}

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