cheater way to crush the JVM.

KillVM.java

import java.lang.reflect.Field;
import sun.misc.Unsafe;

public class KillVM {
    public static void main(String... args) {
        Unsafe unsafe = null;

        try {
            Field field = sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
            field.setAccessible(true);
            unsafe = (sun.misc.Unsafe)field.get(null);
        } catch(Exception e) {
            throw new AssertionError(e);
        }

        unsafe.getAdress(123123); // or any other random gibberish
        // chances that you will read a valid java object are virtually zero

        // just to be safe, let's kill the VM
        unsafe.putAddress(123, 0); // trying  to write into lower level memory area will crash the VM


        // actually working code. just kept for reference
        //
        // long value = 12345;
        // byte size = 1;
        // long value_ptr = unsafe.allocateMemory(size);
        // unsafe.putAddress(value_ptr, value);
        // long readValue = unsafe.getAddress(value_ptr);
        // System.out.println("stored value is: " + readValue);
    }
}