java继承的spring autowired属性为null

Question

EDIT: My question is not about why Spring bean is null, but about why inherited bean is null? Proposed answer explains why new operator does not work with autowiring. But my question is about inheritance. I have two classes:

@Transactional
public class A {

    @Autowired
    protected SessionFactory sessionFactory;

    //other methods
}

public class B extends A {

    Session session = sessionFactory.getCurrentSession();

    //other methods
}

In Main.java I get NPE - class B dont have access to property A((( And I dont understand why(((

A inst1 = new B(); - dont have access to body of B.
B inst2 = new B(); - inside class B sessionFactory is null(((

What I do wrong? I need to have access to body of B, and to properties of superior class. Bean sessionFactory is working:

ApplicationContext context = new ClassPathXmlApplicationContext("application-context.xml");
        SessionFactory sessionfactory = (SessionFactory) context.getBean("sessionFactory");
        Session session = sessionfactory.getCurrentSession();//works

Answer 1

If you are getting NPE, is because sessionFactory is not being injected, instead that you haven't access to sessionFactory property.

If you can get an instance of sessionFactory after loading your application context, then this bean is right configured.

So I believe your problem has to be related with autowired annotation config. Do you have <context:annotation-config /> into your application context? or have you got a bean of class org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor defined into your application context? - Has your beans xml node