Аннотация и рефлексия

@MethodInvocation
public void sort() {
        quickSort(0, array.length - 1);
    }

@Target(value = ElementType.METHOD)
@Retention(value = RetentionPolicy.RUNTIME)
public @interface MethodInvocation {

    Printable quick = new QuickSort();
        Method[] methods = quick.getClass().getMethods();
 
        for (Method method : methods) {
            MethodInvocation annos = method.getAnnotation(MethodInvocation.class);
            if (annos != null) {
                try {
                    method.invoke(quick);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
 
        }

java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.netcracker.sort.Runner.main(Runner.java:59)
Caused by: java.lang.NullPointerException
    at com.netcracker.sort.QuickSort.sort(QuickSort.java:34)
    ... 5 more