Method to tell if I am running inside a 32 or 64 Bit JVM

Question

This is a common enough question and always seems to throw up the usual arguments between using sun.arch.data.model" OR "os.arch" as a way of telling.

for example this post .... How can I tell if I'm running in 64-bit JVM or 32-bit JVM (from within a program)?

I have put this quick method together, can anyone spot any loop holes as I want to cover all possibilities as our app may be deployed on AWS servers or standalone machines

private static boolean is64BitJVM()
{
    String jvmBitSizeUsingSunProperty = System.getProperty("sun.arch.data.model");
    if( jvmBitSizeUsingSunProperty != null && jvmBitSizeUsingSunProperty.length() > 0)
    {
        return jvmBitSizeUsingSunProperty.contains("64");
    }
    else
    {
        String jvmBitSizeUsing_os_Property = System.getProperty("os.arch");
        if( jvmBitSizeUsing_os_Property != null && jvmBitSizeUsing_os_Property.length() > 0)
        {
            return jvmBitSizeUsing_os_Property.contains("64");
        }
    }
    return false;
}

You probably want to try http://codereview.stackexchange.com/. — Duncan Jones, Dec 18 '13 at 15:59

score 1 · Answer 1 · answered Dec 18 '13 at 16:05

1

Instead of doing

if (test)
{
    return true;
}
else
{
    return false;
}

you can just do

return test;

answered Dec 18 '13 at 16:05

Peter Lawrey

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It can't be said often enough ... +1 – Ingo Dec 18 '13 at 16:08

Method to tell if I am running inside a 32 or 64 Bit JVM

1 Answers1