How to find the OS bit type [duplicate]

Answer 1

This should help you

System.getProperty("os.arch");

will return "x86" when the architecture of JRE is 32 bit. We have to write native code to get the real architecture of the system using JNI.

Answer 2

The best solution (which is also cross-platform IMO) is the answer given here: https://stackoverflow.com/a/2269242/1973164

I don't exactly trust reading the os.arch system variable. While it works if a user is running a 64bit JVM on a 64bit system. It doesn't work if the user is running a 32bit JVM on a 64 bit system.

The following code works for properly detecting Windows 64-bit operating systems. On a Windows 64 bit system the environment variable "Programfiles(x86)" will be set. It will NOT be set on a 32-bit system and java will read it as null.

boolean is64bit = false;
if (System.getProperty("os.name").contains("Windows")) {
    is64bit = (System.getenv("ProgramFiles(x86)") != null);
} else {
    is64bit = (System.getProperty("os.arch").indexOf("64") != -1);
}

For other operating systems like Linux or Solaris or Mac we may see this problem as well. So this isn't a complete solution. For mac you are probably safe because apple locks down the JVM to match the OS. But Linux and Solaris, etc.. they may still use a 32-bit JVM on their 64-bit system. So use this with caution.

Answer 3

System.getProperty("os.arch") will always return the bit type of the jre and not of the actual operating system.

Write jni code and calll IsWow64Process from winapi. Since you are using windows.

This boolean function tells you whether the process is running on 64-bit os.