How can you deliberately drop the JVM?

Question

Java

How can you drop the JVM, I heard that they might ask this at an interview, and I myself became interested.

Answer 1

Well, well, all your examples are just unhandled exceptions. Usually by "drop" they mean more fun things. Let's take Unsafe and read a byte at address zero.

import sun.misc.Unsafe;

public class CrashTheJVM
{
    private static final Unsafe UNSAFE = createUnsafe();

    private static Unsafe createUnsafe()
    {
        try
        {
            Field uf = Unsafe.class.getDeclaredField("theUnsafe");
            uf.setAccessible(true);
            return (Unsafe) uf.get(null);
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }
  
    public static void main(String[] args)
    {
        UNSAFE.getByte(0);
    }
}

Segfolt ! 100% drop. Well, if the SecurityManager forbids doing this or the JVM implementation does not support Unsafe, we will still get an unhandled exception.