Switch between JRE 6 and JRE 7

I was being hammered with the fact that I needed to switch between JAVA 6 and JAVA 7 depending on the device I was managing. The script below was created on Windows 7 (64 bit) and assumes you did install JRE 6 and JRE 7 in both 32 bit and 64 bit versions.

@ECHO OFF

:VARIABLES

SET JAVA6SRC64=“C:\Program Files\Java\jre6\bin”

SET JAVA6SRC32=“C:\Program Files (x86)\Java\jre6\bin”

SET JAVA7SRC64=“C:\Program Files\Java\jre7\bin”

SET JAVA7SRC32=“C:\Program Files (x86)\Java\jre7\bin”

SET JAVADST64=C:\Windows\System32

SET JAVADST32=C:\Windows\SysWOW64

SET REGKEY=“HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment”

SET REGVAL=“CurrentVersion”


	
ECHO “Trying to switch to JAVA %1”

IF “%1”  "6" (
:JAVA6
        SET JAVASRC64=%JAVA6SRC64%
        SET JAVASRC32=%JAVA6SRC32%
        REG ADD %REGKEY% /v %REGVAL% /d "1.%1" /f
) ELSE IF "%1"  “7” (

:JAVA7
        SET JAVASRC64=%JAVA7SRC64%
        SET JAVASRC32=%JAVA7SRC32%
        REG ADD REGKEY /v REGVAL /d “1.%1” /f

) ELSE (
        ECHO “Variable %1 is not a valid JAVA version!”
        ECHO “Current version hint:”
        REG QUERY “HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment” /v CurrentVersion
        GOTO END

)

	
:SWITCH

COPY JAVASRC64%\java.exe %JAVADST64

COPY JAVASRC64%\javaw.exe %JAVADST64

COPY JAVASRC64%\javaws.exe %JAVADST64

COPY JAVASRC32%\java.exe %JAVADST32

COPY JAVASRC32%\javaw.exe %JAVADST32

COPY JAVASRC32%\javaws.exe %JAVADST32

	
:CLEANUP

SET JAVASRC64=”“

SET JAVASRC32=”“

	
:END

You can download it as well as javaswitch.bat
Just install it to a directory in your PATH like C:\Windows\ and you should be ready.

Usage:
JAVASWITCH 6 will activate JRE 6
JAVASWITCH 7 will activate JRE 7

Warning:
You should close ALL browsers before you switch JRE!

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