JAVA HOME directory in Linux

Question

Is there any linux command I could use to find out JAVA HOME directory  I ve tried print out the environment variables   env   but I can t find the directory

User · Answer

I know this is late  but this command searches the  usr  directory to find java for you  sudo find  usr  -name  jdk   Results to   usr lib jvm java-6-openjdk  usr lib jvm java-1 6 0-openjdk   FYI  if you are on a Mac  currently JAVA HOME is located at   System Library Frameworks JavaVM framework Home

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Did you set your JAVA HOME   Korn and bash shells export JAVA HOME jdk-install-dir  Bourne shell JAVA HOME jdk-install-dir export JAVA HOME C shell setenv JAVA HOME jdk-install-dir

User · Answer

On Linux you can run   dirname   dirname   readlink -f   which javac      On Mac you can run   dirname   readlink   which javac    java home  I m not sure about windows but I imagine where javac would get you pretty close

User · Answer

On the Terminal  type   echo   JAVA HOME   If you are not getting anything  then your environment variable JAVA HOME has not been set  You can try using  locate java  to try and discover where your installation of Java is located

User · Answer

Here s an improvement  grabbing just the directory to stdout   java -XshowSettings properties -version 2 gt  amp 1        sed       space    java  home  d s     space    java  home   space        space

User · Answer

To show the value of an environment variable you use      echo  VARIABLE   so in your case will be      echo  JAVA HOME   In case you don t have it setted  you can add in your  bashrc file      export JAVA HOME   readlink -f  usr bin java   sed  s bin java       and it will dynamically change when you update your packages

User · Answer

http   www gnu org software sed manual html node Print-bash-environment html Print-bash-environment  If you really want to get some info about your BASH put that script in your  bashrc and watch it fly by  You can scroll around and look it over

User · Answer

Just another solution  this one s cross platform  uses java   and points you to the location of the jre    java -XshowSettings properties -version 2 gt  amp 1  gt   dev null   grep  java home    Outputs all of java s current settings  and finds the one called java home    For windows  you can go with findstr instead of grep   java -XshowSettings properties -version 2 gt  amp 1   findstr  java home

User · Answer

echo  JAVA HOME will print the value if it s set  However  if you didn t set it manually in your startup scripts  it probably isn t set   If you try which java and it doesn t find anything  Java may not be installed on your machine  or at least isn t in your path   Depending on which Linux distribution you have and whether or not you have root access  you can go to http   www java com to download the version you need   Then  you can set JAVA HOME to point to this directory   Remember  that this is just a convention and shouldn t be used to determine if java is installed or not

User · Answer

If  JAVA HOME is defined in your environment       echo  JAVA HOME     I am not lucky      You can guess it from the classes that are loaded     java -showversion -verbose 2 gt  amp 1   head -1  Opened  usr lib jvm java-1 7 0-openjdk-1 7 0 75 x86 64 jre lib rt jar    This method ensures you find the correct jdk jre used in case there are multiple installations    Or using strace     strace -e open java -showversion 2 gt  amp 1   grep -m1  jre  open   usr lib jvm java-1 7 0-openjdk-1 7 0 75 x86 64 jre bin    lib amd64 jli tls x86 64 libpthread so 0   O RDONLY    -1 ENOENT  No such file or directory

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