JRE installation directory in Windows

Question

Is there any command to check the active  since the machine can have more than 1 JRE installed  JRE installation directory under Windows  For linux  the corresponding command is  which java   Is there any Windows equivalent

User · Answer

Not as a command  but this information is in the registry    Open the key HKEY LOCAL MACHINE SOFTWARE JavaSoft Java Runtime Environment Read the CurrentVersion REG SZ Open the subkey under Java Runtime Environment named with the CurrentVersion value Read the JavaHome REG SZ to get the path   For example on my workstation i have  HKEY LOCAL MACHINE SOFTWARE JavaSoft Java Runtime Environment   CurrentVersion    1 6  HKEY LOCAL MACHINE SOFTWARE JavaSoft Java Runtime Environment 1 5   JavaHome    C  Program Files Java jre1 5 0 20  HKEY LOCAL MACHINE SOFTWARE JavaSoft Java Runtime Environment 1 6   JavaHome    C  Program Files Java jre6    So my current JRE is in C  Program Files Java jre6

User · Answer

Look the answer to my previous question here  c   gt  for  i in  java exe  do  echo       PATH i C  WINDOWS system32 java exe

User · Answer

In the command line you can type java -version

User · Answer

Following on from my other comment  here s a batch file which displays the current JRE or JDK based on the registry values   It s different from the other solutions in instances where java is installed  but not on the PATH    ECHO off  SET KIT JavaSoft Java Runtime Environment call ReadRegValue VER  HKLM Software  KIT    CurrentVersion  IF   VER   NEQ    GOTO FoundJRE  SET KIT Wow6432Node JavaSoft Java Runtime Environment call ReadRegValue VER  HKLM Software  KIT    CurrentVersion  IF   VER   NEQ    GOTO FoundJRE  SET KIT JavaSoft Java Development Kit call ReadRegValue VER  HKLM Software  KIT    CurrentVersion  IF   VER   NEQ    GOTO FoundJRE  SET KIT Wow6432Node JavaSoft Java Development Kit call ReadRegValue VER  HKLM Software  KIT    CurrentVersion  IF   VER   NEQ    GOTO FoundJRE  ECHO Failed to find Java GOTO  EOF   FoundJRE call ReadRegValue JAVAPATH  HKLM Software  KIT   VER    JavaHome  ECHO  JAVAPATH  GOTO  EOF   ReadRegValue SET key  2  SET name  3  SET    1   SET reg reg IF DEFINED ProgramFiles x86      IF EXIST  WINDIR  sysnative reg exe SET reg  WINDIR  sysnative reg exe   FOR  F  usebackq tokens 3  skip 1    A IN    reg  QUERY  key   v  name  2  gt NUL   DO SET    1   A   B  GOTO  EOF

User · Answer

where java works for me to list all java exe but java -verbose tells you which rt jar is used and thus which jre  full path     Opened C  Program Files Java jre6 lib rt jar        Edit  win7 and java   java version  1 6 0 20  Java TM  SE Runtime Environment  build 1 6 0 20-b02  Java HotSpot TM  64-Bit Server VM  build 16 3-b01  mixed mode

[java] JRE installation directory in Windows

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