How Can I Programmatically Determine My JVM's Bitness (32-bit or 64-bit)?

Checking JVM Bitness from Within a Program

Determining whether a JVM is running in 32-bit or 64-bit mode is crucial for compatibility and performance considerations. Here's how to detect the JVM bitness from within your application:

In earlier versions of Java (prior to Java 10), you could use the -d32 and -d64 command-line flags to force a specific JVM bitness. By passing these flags with the -version command, you could verify the JVM's actual bitness.

However, with the advent of modern Java versions, these flags have been phased out. Therefore, for Java 10 and above, the command-line approach is no longer applicable.

As an alternative, you can utilize the System.getProperty() method to inspect the sun.arch.data.model system property. This property returns a string denoting the JVM's bitness: "32" or "64".

String bitness = System.getProperty("sun.arch.data.model");

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