public class Foo {
   int i;
   
   public void body(){
       System.out.println("i=" + i);
       Bar.VH_FOO_FIELD_I.compareAndSet(this, 0, 1);
       System.out.println("i=" + i);
   }
   
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Foo f = new Foo();
        f.body();     
    }   
}
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;

/**
 *
 * @author davidclarke
 */
public class Bar {
     public static final VarHandle VH_FOO_FIELD_I;

    static {
        try {
            VH_FOO_FIELD_I = MethodHandles.lookup().
                in(Foo.class).
                findVarHandle(Foo.class, "i", int.class);
        } catch (Exception e) {
            throw new Error(e);
        }
    }   
}
Compiles and runs OK from command line gives
Exception in thread "main" java.lang.invoke.WrongMethodTypeException: cannot convert MethodHandle(VarHandle,Foo,int,int)boolean to (VarHandle,Object[])boolean
	at java.base/java.lang.invoke.MethodHandle.asTypeUncached(MethodHandle.java:785)
	at java.base/java.lang.invoke.MethodHandle.asType(MethodHandle.java:771)
	at java.base/java.lang.invoke.Invokers.checkVarHandleGenericType(Invokers.java:450)
	at au.com.wcc.vectors.Foo.body(Foo.java:19)
	at au.com.wcc.vectors.Foo.main(Foo.java:28)
under NetBeans

NetBeans etc/netbeans.conf edited to use Java 8 to load (else it just quits).