How Can I Programmatically Determine My JVM's Bitness?

How to Determine JVM Bitness From Within a Program

To ascertain whether an application runs in a 32-bit or 64-bit JVM, you can consult the Java virtual machine (JVM) specifications. For Java versions prior to Java 9, you could use the command-line flags -d32 and -d64 to specify the desired bitness of the JVM.

Checking JVM Bitness with Command-Line Flags

To check if a JVM is 64-bit, run the following command:

java -d64 -version

If the JVM is not 64-bit, you will receive the following error:

Error: This Java instance does not support a 64-bit JVM.
Please install the desired version.

Similarly, to verify a 32-bit JVM, execute the following command:

java -d32 -version

If the JVM is not 32-bit, you will encounter the following error:

Error: This Java instance does not support a 32-bit JVM.
Please install the desired version.

Note: These flags were added in Java 7, deprecated in Java 9, removed in Java 10, and are no longer available in recent Java versions.

Therefore, when running Java versions beyond Java 9, alternative methods to determine JVM bitness are required and can be found in the updated Java documentation.

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