JAVA_HOME не установлен. (RuntimeError) при установке rjb gem для ruby в WSL

Question

Я пытаюсь установить gem rjb, и я столкнулся с этой ошибкой

extconf.rb:53:in <main>': JAVA_HOME is not set. (RuntimeError).

Ниже приводится полный журнал ошибок.

$sudo gem install rjb -v '1.4.9' --source 'https://rubygems.org/'
[sudo] password for santoshpavan:
Building native extensions. This could take a while...
ERROR:  Error installing rjb:
        ERROR: Failed to build gem native extension.

    current directory: /var/lib/gems/2.5.0/gems/rjb-1.4.9/ext
/usr/bin/ruby2.5 -r ./siteconf20200411-19244-10jhs3k.rb extconf.rb
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/usr/bin/$(RUBY_BASE_NAME)2.5
extconf.rb:53:in `<main>': JAVA_HOME is not set. (RuntimeError)

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.5.0/gems/rjb-1.4.9 for inspection.
Results logged to /var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/rjb-1.4.9/gem_make.out

Я попробовал ответ, который упомянут здесь .

Когда я напечатал env, я вижу упомянутый путь JAVA_HOME, как показано ниже.

santoshpavan@DESKTOP-ISVIQCL:/mnt/c/code/expertiza$ env
LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;36:*.spx=00;36:*.xspf=00;36:
HOSTTYPE=x86_64
LESSCLOSE=/usr/bin/lesspipe %s %s
LANG=C.UTF-8
OLDPWD=/mnt/c
WSL_DISTRO_NAME=Ubuntu-18.04
JAVA_HOME=/mnt/c/Program Files/Java/jdk-10.0.2
S_COLORS=auto
USER=santoshpavan
RBENV_SHELL=bash
PWD=/mnt/c/code/expertiza
HOME=/home/santoshpavan
NAME=DESKTOP-ISVIQCL
XDG_DATA_DIRS=/usr/local/share:/usr/share:/var/lib/snapd/desktop
SHELL=/bin/bash
TERM=xterm-256color
SHLVL=1
LOGNAME=santoshpavan
PATH=/home/santoshpavan/.yarn/bin:/home/santoshpavan/.config/yarn/global/node_modules/.bin:/home/santoshpavan/.rbenv/plugins/ruby-build/bin:/home/santoshpavan/.rbenv/shims:/home/santoshpavan/.rbenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/mnt/c/Program Files/WindowsApps/CanonicalGroupLimited.Ubuntu18.04onWindows_2020.1804.7.0_x64__79rhkp1fndgsc:/mnt/c/Python37/Scripts/:/mnt/c/Python37/:/mnt/c/Python27/:/mnt/c/Python27/Scripts:/mnt/c/Users/santo/AppData/Local/Programs/Python/Python37-32/Scripts/:/mnt/c/Users/santo/AppData/Local/Programs/Python/Python37-32/:/mnt/c/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v10.1/bin:/mnt/c/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v10.1/libnvvp:/mnt/c/app/santo/product/12.1.0/dbhome_1/bin:/mnt/c/Program Files/Java/jdk-10.0.2/bin:/mnt/c/Windows/system32:/mnt/c/Windows:/mnt/c/Windows/System32/Wbem:/mnt/c/Windows/System32/WindowsPowerShell/v1.0/:/mnt/c/Program Files (x86)/NVIDIA Corporation/PhysX/Common:/mnt/c/WINDOWS/system32:/mnt/c/WINDOWS:/mnt/c/WINDOWS/System32/Wbem:/mnt/c/WINDOWS/System32/WindowsPowerShell/v1.0/:/mnt/c/WINDOWS/System32/OpenSSH/:/mnt/c/Program Files/NVIDIA Corporation/NVIDIA NvDLISR:/mnt/c/WINDOWS/system32:/mnt/c/WINDOWS:/mnt/c/WINDOWS/System32/Wbem:/mnt/c/WINDOWS/System32/WindowsPowerShell/v1.0/:/mnt/c/WINDOWS/System32/OpenSSH/:/mnt/c/ProgramData/chocolatey/bin:/mnt/c/Program Files/Git/cmd:/mnt/c/Program Files/nodejs/:/mnt/c/Program Files/NVIDIA Corporation/Nsight Compute 2019.4.0/:/mnt/c/Apache/apache-zookeeper-3.5.6-bin/bin:/mnt/c/Program Files/Java/jdk-10.0.2/bin:/mnt/c/Spark/spark-3.0.0-preview2-bin-hadoop2.7:/mnt/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/DAL:/mnt/c/Program Files/Intel/Intel(R) Management Engine Components/DAL:/mnt/c/Program Files/PostgreSQL/12/bin:/mnt/c/Program Files/PostgreSQL/12/lib:/mnt/c/Program Files/Intel/WiFi/bin/:/mnt/c/Program Files/Common Files/Intel/WirelessCommon/:/mnt/c/Users/santo/.cargo/bin:/mnt/c/Ruby27-x64/bin:/mnt/c/Program Files/Git/usr/local/bin:/mnt/c/Program Files/Git/bin:/mnt/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/iCLS/:/mnt/c/Program Files/Intel/Intel(R) Management Engine Components/iCLS/:/mnt/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/IPT:/mnt/c/Program Files/Intel/Intel(R) Management Engine Components/IPT:/mnt/c/WINDOWS/System3:/mnt/c/Program Files/JetBrains/PyCharm Community Edition 2019.3.4/bin:/snap/bin
WSLENV=JAVA_HOME/p
LESSOPEN=| /usr/bin/lesspipe %s
_=/usr/bin/env

Я не понимаю проблему здесь, поскольку JAVA_HOME присутствует в переменных окружения с WSLENV.

Примечание :

Ранее, когда у меня была такая же ошибка После это помогло. Но javac все еще не было обнаружено. Итак, я установил java в wsl, используя $ sudo apt install default-jdk. И после этого эта проблема произошла.