How Can a Java Program Determine its JVM's Bitness (32-bit or 64-bit)?

Detecting JVM Bitness Within a Program

Question:

How can a Java program determine if it is running within a 64-bit or 32-bit Java Virtual Machine (JVM)?

Answer:

While certain versions of Java provided flags for this purpose, modern versions have deprecated or removed them. However, there are alternative methods to detect JVM bitness from within a program.

Solution (Using System Properties):

String javaVersion = System.getProperty("java.version");
if (javaVersion.contains("64-Bit")) {
    // Running in a 64-bit JVM
} else {
    // Running in a 32-bit JVM
}

Solution (Using Reflection):

try {
    Class<?> runtimeClass = Class.forName("java.lang.Runtime");
    Field dataModelField = runtimeClass.getDeclaredField("dataModel");
    dataModelField.setAccessible(true);
    String dataModel = (String) dataModelField.get(null);
    if (dataModel.equals("64-bit")) {
        // Running in a 64-bit JVM
    } else {
        // Running in a 32-bit JVM
    }
} catch (Exception e) {
    // Handle exceptions gracefully
}

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