Question

I have many Java versions installed on a Windows 7 machine. Some of them are 32 bits, some are 64 bits. Now as default it starts one of those last versions (1.7 64 bits). How do I tell my Windows 7 machine to use another version of Java? One of the reasons is that I’m developing a JNI project from Microsoft Visual Studio C++ – it uses also java 1.7 64 bits.

Best regards,
Andrej

I have set:

User variable:
JAVA_HOME=C:\j2sdk1.4.2_04
PATH=%JAVA_HOME%\bin;%PATH%

and system variable:
JAVA_HOME=C:\j2sdk1.4.2_04
PATH=…a_lot_of_paths…;%JAVA_HOME%\bin;%PATH%

I had no idea which is better to set – for user or system settings. Done both.

System restart.

And…it didn’t helped 🙁
When I run “java -version” from cmd i have java 1.7, but not java 1.4 like defined in PATH.

after run C:>where java
I got two results:

C:\Windows\System32\java.exe
C:\j2sdk1.4.2_04\bin\java.exe

Who let Java go to my windows directory ???!!!

How to deal with that?

Answer 1

Set JAVA_HOME:

JAVA_HOME="c:\path\to\jdk"

Set PATH:

PATH=%JAVA_HOME%\bin;%PATH%

Also, you might want to have a look at the Control Panel where there is a Java Settings/Java Control Panel and you can also set the default from there, but this will only be valid for use from your browsers, if I recall correctly.

You will also most-likely need to restart.