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?