Forum posts for regedit.exe

How to detect Java is installed via REGEDIT.exe from a batch file?

I am looking for a batch file snippet that somehow reads the Windows registry and detects which Java JDK is on a Windows system and then asks the user which one they want to use and remembers the choice.

Here is what I have so far... needs some modifications. This script only finds the first JDK... it doesn't handle multiples.

@echo off
SETLOCAL EnableDelayedExpansion
:: findJDK.bat
start /w regedit /e reg1.txt 'HKEY_LOCAL_MACHINESOFTWAREJavaSoftJava Development Kit'
type reg1.txt | find 'JavaHome' > reg2.txt
if errorlevel 1 goto ERROR
for /f 'tokens=2 delims==' %%x in (reg2.txt) do (
set JavaTemp=%%~x
echo Regedit: JAVA_HOME path : !JavaTemp!
)
if errorlevel 1 goto ERROR
echo.
set JAVA_HOME=%JavaTemp%
set JAVA_HOME=%JAVA_HOME:\=\%
echo JAVA_HOME was found to be %JAVA_HOME%
goto END
:ERROR
echo reg1.txt is: & type reg1.txt
echo reg2.txt is: & type reg2.txt
echo
:END
del reg2.txt
del reg1.txt
pause>nul

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