Get OS Architecture in Java

 

Recently I came across a situation where I had to find the OS architecture and the JRE architecture i.e. I had to determine if my Windows had a 32 or 64 bit architecture and if my JRE was 32 or 64 bit from a JAVA program.

Soon I realised that "os.arch"  system property will only give you the architecture of the JRE, not of the underlying OS. It means, if you install a 32 bit JRE on a 64 bit system, System.getProperty("os.arch") will return  x86.

So I had to find another way to get the OS architecture. I came up with a simple JAVA program that uses the command line string "wmic OS get OSArchitecture" to get the underlying OS Architecture.

The following program will retrieve all the required parameters:

	import java.io.*;
	public class User {
	public static void main(String[] args) throws Exception {
	System.out.println("OS --> "+System.getProperty("os.name")); //OS Name such as Windows/Linux
	System.out.println("JRE Architecture --> "+System.getProperty("sun.arch.data.model")+" bit."); // JRE architecture i.e 64 bit or 32 bit JRE
	ProcessBuilder builder = new ProcessBuilder(
	"cmd.exe", "/c","wmic OS get OSArchitecture");
	builder.redirectErrorStream(true);
	Process p = builder.start();
	String result = getStringFromInputStream(p.getInputStream());
	if(result.contains("64"))
	System.out.println("OS Architecture --> is 64 bit"); //The OS Architecture
	else
	System.out.println("OS Architecture --> is 32 bit");
	}
	private static String getStringFromInputStream(InputStream is) {
	BufferedReader br = null;
	StringBuilder sb = new StringBuilder();
	String line;
	try {
	br = new BufferedReader(new InputStreamReader(is));
	while ((line = br.readLine()) != null) {
	sb.append(line);
	}
	} catch (IOException e) {
	e.printStackTrace();
	} finally {
	if (br != null) {
	try {
	br.close();
	} catch (IOException e) {
	e.printStackTrace();
	}
	}
	}
	return sb.toString();
	}
	}

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