Basic annotation processor

ObjectFactory.java

package learnquest;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;

public class ObjectFactory {
	public static <T> T create(Class<T> clazz) throws Exception {
		T instance = clazz.newInstance();
		processAnnotations(instance);
		return instance;
	}

	private static void processAnnotations(Object instance) throws Exception {
		// find all annotations at class level and print them
		printClassLevelAnnotations(instance);
		printFieldLevelAnnotations(instance);
		injectDependenciesOnFields(instance);
	}

	private static void injectDependenciesOnFields(Object instance) throws Exception {
		Field[] declaredFields = instance.getClass().getDeclaredFields();
		for (Field field : declaredFields) {
			Annotation[] declaredAnnotations = field.getDeclaredAnnotations();
			for (Annotation annotation : declaredAnnotations) {
				if(annotation instanceof Inject){
					Inject inject = (Inject) annotation;
					String value = inject.value();
					boolean accessible = field.isAccessible();
					field.setAccessible(true);
					field.set(instance, value);
					field.setAccessible(accessible);
				}
			}
		}
	}

	private static void printFieldLevelAnnotations(Object instance) {
		System.out
		.println("**************FIELD LEVEL ANNOTATIONS******************");
		Field[] fields = instance.getClass().getDeclaredFields();
		for (Field field : fields) {
			Annotation[] declaredAnnotations = field.getDeclaredAnnotations();
			for (Annotation annotation : declaredAnnotations) {
				System.out.println(annotation);
			}
		}
		
	}

	private static void printClassLevelAnnotations(Object instance) {
		System.out
				.println("**************CLASS LEVEL ANNOTATIONS******************");
		Annotation[] declaredAnnotations = instance.getClass()
				.getDeclaredAnnotations();
		for (Annotation annotation : declaredAnnotations) {
			System.out.println(annotation);
		}
	}
	public static void main(String[] args) throws Exception {
		Person person = create(Person.class);
		String firstName = person.getFirstName();
		System.out.println("Person has a firstname of "+firstName);
	}
}