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Mac Big Sur 升级后 JD-GUI 无法打开的问题修复

升级 Big Sur 后发现JD-GUI 打开报错：

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.

参见 JD-GUI 的issue ：Update universalJavaApplicationStub to be able to launch on macOS Big Sur #336
我们需要替换一个文件；universalJavaApplicationStub.sh (version 3.0.6)，问题出现的原因是在 MacOS Big Sur的版本中，/usr/libexec/java_home组合选项-F和-v不再支持有+的字符串查看 JVM 版本，软件的的 info.plist 如果java的版本是一个包含+的字符串,如1.8+，则会出现错误无法开启软件。解释的可能不是很清楚，用命令演示可能会更直接。

/usr/libexec/java_home很容易找到你在你的电脑上安装的jdk版本，我们可以通过/usr/libexec/java_home -F 查看：

Matching Java Virtual Machines (2):

1.8.0_221 (x86_64) “Oracle Corporation” – “Java SE 8” /Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Home

1.8.0_91 (x86_64) “Oracle Corporation” – “Java SE 8” /Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home

/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Home

上面命令中-F就是显示已安装的全部的 JVM 版本，JVM括号中的2表示我的电脑安装两个JVM，最后一行显示的当前运行的版本。-v参数就是查询指定版本的JVM。在MacOS Big Sur 以前，/usr/libexec/java_home通过-v参数支持“模糊”匹配，比如/usr/libexec/java_home -F -v'1.8+'查找1.8以及1.8以上的JVM，也支持*，/usr/libexec/java_home -F -v'1.8*'。MacOS Big Sur中，该命令不支持包含有+和*的组合选项了，只支持精确的查找：/usr/libexec/java_home -F -v'1.8'或者“模糊”查找/usr/libexec/java_home -v'1.8+'。

吧啦吧啦说了一堆，也就是查找的JVM版本字符串要用+就不能用-F，否则就不要用+。

解释清楚了问题的原因，我们就可以根据universalJavaApplicationStub.sh作者提供的脚本进行修复了。脚本内容如下，对于有些打不开github的同学可以直接复制下面的脚本，如果能打开github，点击传送门下载：

【pierswalter 提供的脚本】https://github.com/pierswalter/jd-gui/blob/universalJavaApplicationStub/src/osx/resources/universalJavaApplicationStub.sh。
【tofi86 提供的v3.0.6的版本】https://github.com/tofi86/universalJavaApplicationStub/blob/v3.0.6/src/universalJavaApplicationStub 。

替换 pierswalter 的脚本之后出现下面的错误：

ERROR launching ‘JD-GUI’!

You need to have JAVA installed on your Mac! Visit http://java.com for more information…

替换tofi86的脚本也会出现如下信息：

无法启动 ‘JD-GUI’.

没有在系统中找到合适的Java版本！必须安装Java 8 及以上版本才能够使用该程序！. 请确保系统中安装了所需的Java版本

上图为pierswalte提供的修改脚本和原来的脚本的新(右)旧(左)脚本的差异对比结果。在新(右边)旧(左边)版本的比较图中，作者修改了判断命令，却没有修改最终执行的命令。所以在新版中要把-F参数删掉。下面脚本我已做了修改。最后，在pierswalte的基础上我提交了一个修改过的版本，不知道会不会被jd-gui官方仓库采纳。

#!/bin/sh
##################################################################################
#                                                                                #
# universalJavaApplicationStub                                                   #
#                                                                                #
#                                                                                #
# A shellscript 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      2015-05-15                                                          #
# @version   0.9.0                                                               #
#                                                                                #
#                                                                                #
##################################################################################
#                                                                                #
#                                                                                #
# The MIT License (MIT)                                                          #
#                                                                                #
# Copyright (c) 2015 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.                                                                      #
#                                                                                #
##################################################################################




#
# resolve symlinks
#####################

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

# set the directory abspath of the current shell script
PROGDIR=`dirname "$PRG"`




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

# the absolute path of the app package
cd "$PROGDIR"/../../
AppPackageFolder=`pwd`

# the base path of the app package
cd ..
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=""



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


# read the program name from CFBundleName
CFBundleName=`/usr/libexec/PlistBuddy -c "print :CFBundleName" "${InfoPlistFile}"`

# read the icon file name
CFBundleIconFile=`/usr/libexec/PlistBuddy -c "print :CFBundleIconFile" "${InfoPlistFile}"`


# 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 in Apple style if exit code returns 0 (true, :Java key is present)
if [ $exitcode -eq 0 ]; then

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

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


    # read the Java WorkingDirectory
    JVMWorkDir=`/usr/libexec/PlistBuddy -c "print ${JavaKey}:WorkingDirectory" "${InfoPlistFile}" 2> /dev/null | xargs`

    # set Working Directory based upon Plist info
    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=`/usr/libexec/PlistBuddy -c "print ${JavaKey}:MainClass" "${InfoPlistFile}" 2> /dev/null`

    # read the JVM Options
    JVMOptions=`/usr/libexec/PlistBuddy -c "print ${JavaKey}:Properties" "${InfoPlistFile}" 2> /dev/null | grep " =" | sed 's/^ */-D/g' | tr '\n' ' ' | sed 's/  */ /g' | sed 's/ = /=/g' | xargs`

    # read StartOnMainThread
    JVMStartOnMainThread=`/usr/libexec/PlistBuddy -c "print ${JavaKey}:StartOnMainThread" "${InfoPlistFile}" 2> /dev/null`
    if [ "${JVMStartOnMainThread}" == "true" ]; then
        echo ${JVMStartOnMainThread} > ~/Desktop/test.txt
        JVMOptions+=" -XstartOnFirstThread"
    fi

    # read the ClassPath in either Array or String style
    JVMClassPath_RAW=`/usr/libexec/PlistBuddy -c "print ${JavaKey}:ClassPath" "${InfoPlistFile}" 2> /dev/null`
    if [[ $JVMClassPath_RAW == *Array* ]] ; then
        JVMClassPath=.`/usr/libexec/PlistBuddy -c "print ${JavaKey}:ClassPath" "${InfoPlistFile}" 2> /dev/null | 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 Default Options
    JVMDefaultOptions=`/usr/libexec/PlistBuddy -c "print ${JavaKey}:VMOptions" "${InfoPlistFile}" 2> /dev/null | xargs`

    # read the JVM Arguments
    JVMArguments=`/usr/libexec/PlistBuddy -c "print ${JavaKey}:Arguments" "${InfoPlistFile}" 2> /dev/null | xargs`

    # read the Java version we want to find
    JVMVersion=`/usr/libexec/PlistBuddy -c "print ${JavaKey}:JVMVersion" "${InfoPlistFile}" 2> /dev/null | xargs`

# read Info.plist in Oracle style
else

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

    APP_ROOT="${AppPackageFolder}"

    # read the MainClass name
    JVMMainClass=`/usr/libexec/PlistBuddy -c "print :JVMMainClassName" "${InfoPlistFile}" 2> /dev/null`

    # read the JVM Options
    JVMOptions=`/usr/libexec/PlistBuddy -c "print :JVMOptions" "${InfoPlistFile}" 2> /dev/null | grep " -" | tr -d '\n' | sed 's/  */ /g' | xargs`
    # replace occurances of $APP_ROOT with it's content
    JVMOptions=`eval "echo ${JVMOptions}"`

    JVMClassPath="${JavaFolder}/*"

    # read the JVM Default Options
    JVMDefaultOptions=`/usr/libexec/PlistBuddy -c "print :JVMDefaultOptions" "${InfoPlistFile}" 2> /dev/null | grep -o "\-.*" | tr -d '\n' | xargs`

    # read the JVM Arguments
    JVMArguments=`/usr/libexec/PlistBuddy -c "print :JVMArguments" "${InfoPlistFile}" 2> /dev/null | tr -d '\n' | sed -E 's/Array \{ *(.*) *\}/\1/g' | sed 's/  */ /g' | xargs`
    # replace occurances of $APP_ROOT with it's content
    JVMArguments=`eval "echo ${JVMArguments}"`
fi




#
# find installed Java versions
#################################

# first check system variable "$JAVA_HOME"
if [ -n "$JAVA_HOME" ] ; then
    JAVACMD="$JAVA_HOME/bin/java"

# check for specified JVMversion in "/usr/libexec/java_home" symlinks
elif [ ! -z ${JVMVersion} ] && [ -x /usr/libexec/java_home ] && /usr/libexec/java_home -F; then

    if /usr/libexec/java_home -v ${JVMVersion} 2> /dev/null; then
        JAVACMD="`/usr/libexec/java_home -v ${JVMVersion} 2> /dev/null`/bin/java"
    else
        # display error message with applescript
        osascript -e "tell application \"System Events\" to display dialog \"ERROR launching '${CFBundleName}'\n\nNo suitable Java version found on your system!\nThis program requires Java ${JVMVersion}\nMake sure you install the required Java version.\" with title \"${CFBundleName}\" buttons {\" OK \"} default button 1 with icon path to resource \"${CFBundleIconFile}\" in bundle (path to me)"
        # exit with error
        exit 3
    fi

# otherwise check "/usr/libexec/java_home" symlinks
elif [ -x /usr/libexec/java_home ] && /usr/libexec/java_home -F; then
    JAVACMD="`/usr/libexec/java_home 2> /dev/null`/bin/java"

# otherwise check Java standard symlink (old Apple Java)
elif [ -h /Library/Java/Home ]; then
    JAVACMD="/Library/Java/Home/bin/java"

# fallback: public JRE plugin (Oracle Java)
else
    JAVACMD="/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java"
fi

# fallback fallback: /usr/bin/java
# but this would prompt to install deprecated Apple Java 6




#
# execute JAVA commandline and do some pre-checks
####################################################

# display error message if MainClassName is empty
if [ -z ${JVMMainClass} ]; then
    # display error message with applescript
    osascript -e "tell application \"System Events\" to display dialog \"ERROR launching '${CFBundleName}'!\n\n'MainClass' isn't specified!\nJava application cannot be started!\" with title \"${CFBundleName}\" buttons {\" OK \"} default button 1 with icon path to resource \"${CFBundleIconFile}\" in bundle (path to me)"
    # exit with error
    exit 2


# check whether $JAVACMD is a file and executable
elif [ -f "$JAVACMD" ] && [ -x "$JAVACMD" ] ; then

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

    # change to Working Directory based upon Apple/Oracle Plist info
    cd "${WorkingDirectory}"

    # execute Java and set
    #   - classpath
    #   - dock icon
    #   - application name
    #   - JVM options
    #   - JVM default options
    #   - main class
    #   - JVM arguments
    exec "$JAVACMD" \
            -cp "${JVMClassPath}" \
            -Xdock:icon="${ResourcesFolder}/${CFBundleIconFile}" \
            -Xdock:name="${CFBundleName}" \
            ${JVMOptions:+$JVMOptions }\
            ${JVMDefaultOptions:+$JVMDefaultOptions }\
            ${JVMMainClass}\
            ${JVMArguments:+ $JVMArguments}


else

    # display error message with applescript
    osascript -e "tell application \"System Events\" to display dialog \"ERROR launching '${CFBundleName}'!\n\nYou need to have JAVA installed on your Mac!\nVisit http://java.com for more information...\" with title \"${CFBundleName}\" buttons {\" OK \"} default button 1 with icon path to resource \"${CFBundleIconFile}\" in bundle (path to me)"

    # and open java.com
    open http://java.com

    # exit with error
    exit 1
fi