How do I find where JDK is installed on my windows machine

Question

I need to know where JDK is located on my machine    On running Java -version in cmd  it shows the version as  1 6 xx   To find the location of this SDK on my machine I tried using echo  JAVA HOME  but it is only showing  JAVA HOME   as there is no  JAVA PATH  var set in my environment variables

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Plain and simple on Windows platforms   where java

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Under Windows  you can use  C  gt dir  b  s java exe   to print the full path of each and every  java exe  on your C  drive  regardless of whether they are on your PATH environment variable

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Have you tried looking at your  PATH  variable  That s what Windows uses to find any executable

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in Windows cmd   set  JAVA HOME

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Just execute the  set command in your command line  Then you see all the environments variables you have set   Or if on Unix you can simplify it     set   grep  JAVA HOME

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Java installer puts several files into  WinDir  System32 folder  java exe  javaws exe and some others   When you type java exe in command line or create process without full path  Windows runs these as last resort if they are missing in  PATH  folders    You can lookup all versions of Java installed in registry  Take a look at HKLM SOFTWARE JavaSoft Java Runtime Environment and HKLM SOFTWARE Wow6432Node JavaSoft Java Runtime Environment for 32-bit java on 64 bit Windows   This is how java itself finds out different versions installed  And this is why both 32-bit and 64-bit version can co-exist and works fine without interfering

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In Windows PowerShell you can use the Get-Command function to see where Java is installed  Get-Command -All java  Or gcm -All java  The -All part makes sure to show all places it appears in the Path lookup  Below is example output  PS C  gt  gcm -All java  CommandType     Name                                               Version    Source -----------     ----                                               -------    ------ Application     java exe                                           8 0 202 8  C  Program Files  x86  Common Files Oracle Java jav    Application     java exe                                           8 0 131    C  ProgramData Oracle Java javapath java exe

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On macOS  run   cd  tmp  amp  amp  echo  public class Main  public static void main String   args   System out println System getProperty  java home         gt  Main java  amp  amp  javac Main java  amp  amp  java Main   On my machine  this prints    Library Java JavaVirtualMachines jdk-9 0 4 jdk Contents Home   Note that running which java does not show the JDK location  because the java command is instead part of JavaVM framework  which wraps the real JDK     which java  usr bin java  private tmp   ls -l  usr bin java lrwxr-xr-x  1 root  wheel  74 14 Nov 17 37  usr bin java - gt   System Library Frameworks JavaVM framework Versions Current Commands java

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In Windows at the command prompt  where javac

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This is OS specific  On Unix   which java   will display the path to the executable  I don t know of a Windows equivalent  but there you typically have the bin folder of the JDK installation in the system PATH   echo  PATH

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If you are using Linux Unix Mac OS X   Try this     which java   Should output the exact location   After that  you can set JAVA HOME environment variable yourself   In my computer  Mac OS X - Snow Leopard      which java  usr bin java   ls -l  usr bin java lrwxr-xr-x  1 root  wheel  74 Nov  7 07 59  usr bin java - gt   System Library Frameworks JavaVM framework Versions Current Commands java   If you are using Windows   c   gt  for  i in  java exe  do  echo       PATH i

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In a Windows command prompt  just type   set java home   Or  if you don t like the command environment  you can check it from   Start menu   Computer   System Properties   Advanced System Properties  Then open Advanced tab   Environment Variables and in system variable try to find JAVA HOME

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None of these answers are correct for Linux if you are looking for the home that includes the subdirs such as  bin  docs  include  jre  lib  etc   On Ubuntu for openjdk1 8 0  this is in   usr lib jvm java-1 8 0-openjdk-amd64  and you may prefer to use that for JAVA HOME since you will be able to find headers if you build JNI source files  While it s true which java will provide the binary path  it is not the true JDK home

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On Windows 10 you can find out the path by going to Control Panel  gt  Programs  gt  Java  In the panel that shows up  you can find the path as demonstrated in the screenshot below  In the Java Control Panel  go to the  Java  tab and then click the  View  button under the description  View and manage Java Runtime versions and settings for Java applications and applets   This should work on Windows 7 and possibly other recent versions of Windows

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More on Windows    variable java home is not always the same location as the binary that is run    As Denis The Menace says  the installer puts Java files into Program Files  but also java exe into System32  With nothing Java related on the path java -version can still work  However when PeterMmm s program is run it reports the value of Program Files as java home  this is not wrong  Java is installed there  but the actual binary being run is located in System32   One way to hunt down the location of the java exe binary  add the following line to PeterMmm s code to keep the program running a while longer   try Thread sleep 60000   catch Exception e       Compile and run it  then hunt down the location of the java exe image  E g  in Windows 7 open the task manager  find the java exe entry  right click and select  open file location   this opens the exact location of the Java binary  In this case it would be System32

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I have improved munsingh s answer above by testing for the registry key in 64-bit and 32-bit registries  if needed     - Test for the registry location   SET VALUE CurrentVersion SET KEY 1  HKLM SOFTWARE JavaSoft Java Development Kit  SET KEY 2 HKLM SOFTWARE JavaSoft JDK SET REG 1 reg exe SET REG 2  C  Windows sysnative reg exe  SET REG 3  C  Windows syswow64 reg exe   SET KEY  KEY 1  SET REG  REG 1   REG  QUERY  KEY   v  VALUE  2 gt nul IF  ERRORLEVEL  EQU 0 GOTO  set value  SET KEY  KEY 2  SET REG  REG 1   REG  QUERY  KEY   v  VALUE  2 gt nul IF  ERRORLEVEL  EQU 0 GOTO  set value    -  REG 2  is for 64-bit installations  using  C  Windows sysnative  SET KEY  KEY 1  SET REG  REG 2   REG  QUERY  KEY   v  VALUE  2 gt nul IF  ERRORLEVEL  EQU 0 GOTO  set value  SET KEY  KEY 2  SET REG  REG 2   REG  QUERY  KEY   v  VALUE  2 gt nul IF  ERRORLEVEL  EQU 0 GOTO  set value    -  REG 3  is for 32-bit installations on a 64-bit system  using  C  Windows syswow64  SET KEY  KEY 1  SET REG  REG 3   REG  QUERY  KEY   v  VALUE  2 gt nul IF  ERRORLEVEL  EQU 0 GOTO  set value  SET KEY  KEY 2  SET REG  REG 3   REG  QUERY  KEY   v  VALUE  2 gt nul IF  ERRORLEVEL  EQU 0 GOTO  set value    set value FOR  F  tokens 2      a IN    REG  QUERY  KEY   v  VALUE    DO       SET JDK VERSION   b   SET KEY  KEY   JDK VERSION  SET VALUE JavaHome FOR  F  tokens 2      a IN    REG  QUERY  KEY   v  VALUE    DO       SET JAVAHOME   b   ECHO   JAVAHOME     - SETX JAVA HOME   JAVAHOME     reference for access to the 64-bit registry

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The batch script below will print out the existing default JRE  It can be easily modified to find the JDK version installed by replacing the Java Runtime Environment with Java Development Kit    echo off  setlocal    - Get the Java Version set KEY  HKLM SOFTWARE JavaSoft Java Runtime Environment  set VALUE CurrentVersion reg query  KEY   v  VALUE  2 gt nul          echo JRE not installed      exit  b 1   set JRE VERSION  for  f  tokens 2      a in   reg query  KEY   v  VALUE     findstr  VALUE    do       set JRE VERSION   b    echo JRE VERSION   JRE VERSION     - Get the JavaHome set KEY  HKLM SOFTWARE JavaSoft Java Runtime Environment  JRE VERSION   set VALUE JavaHome reg query  KEY   v  VALUE  2 gt nul          echo JavaHome not installed     exit  b 1    set JAVAHOME  for  f  tokens 2      a in   reg query  KEY   v  VALUE     findstr  VALUE    do       set JAVAHOME   b    echo JavaHome   JAVAHOME   endlocal

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Run this program from commandline      File  Main java public class Main        public static void main String   args           System out println System getProperty  java home                  javac Main java   java Main

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bin bash  if      which   JAVA HOME  bin java      then     exe    JAVA HOME  bin java  elif      which java      then     exe  java  else      echo  Java environment is not detected       exit 1 fi    exe  -version   For windows    echo off if   JAVA HOME         goto nojavahome  echo Using JAVA HOME                 JAVA HOME     JAVA HOME  bin java exe  -version goto exit   nojavahome echo The JAVA HOME environment variable is not defined correctly echo This environment variable is needed to run this program  goto exit   exit   This link might help to explain how to find java executable from bash  http   srcode org 2014 05 07 detect-java-executable

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In windows the default is  C  Program Files Java jdk1 6 0 14  where the numbers may differ  as they re the version

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Windows   Start   cmd     C  gt  for  i in  javac exe  do  echo       PATH i   If you have a JDK installed  the Path is displayed  for example  C  Program Files Java jdk1 6 0 30 bin javac exe

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Powershell one liner    p  HKLM  SOFTWARE JavaSoft Java Development Kit    v  gp  p  CurrentVersion   gp  p  v  JavaHome

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Maybe the above methods work    I tried some and didn t for me  What did was this   Run this in terminal    usr libexec java home

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Script for 32 64 bit Windows    echo off  setlocal enabledelayedexpansion    - Get the Java Version set KEY  HKLM SOFTWARE JavaSoft Java Runtime Environment  set KEY64  HKLM SOFTWARE WOW6432Node JavaSoft Java Runtime Environment  set VALUE CurrentVersion reg query  KEY   v  VALUE  2 gt nul          set KEY  KEY64      reg query  KEY   v  VALUE  2 gt nul          echo JRE not installed      exit  b 1      set JRE VERSION  for  f  tokens 2      a in   reg query  KEY   v  VALUE     findstr  VALUE    do       set JRE VERSION   b    echo JRE VERSION   JRE VERSION     - Get the JavaHome set KEY  HKLM SOFTWARE JavaSoft Java Runtime Environment  JRE VERSION   set KEY64  HKLM SOFTWARE WOW6432Node JavaSoft Java Runtime Environment  JRE VERSION   set VALUE JavaHome reg query  KEY   v  VALUE  2 gt nul          set KEY  KEY64      reg query  KEY   v  VALUE  2 gt nul          echo JavaHome not installed     exit  b 1      set JAVAHOME  for  f  tokens 2      a in   reg query  KEY   v  VALUE     findstr  VALUE    do       set JAVAHOME   b    echo JavaHome   JAVAHOME   endlocal

[java] How do I find where JDK is installed on my windows machine?

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