Difference between Application context and Beanfactory in Spring framework

The Spring framework provides two IoC (Inversion of Control) containers for managing, configuring, and manipulating beans − BeanFactory and ApplicationContext.

The ApplicationContext interface extends BeanFactory to provide additional enterprise-level functionality. In modern Spring versions, ApplicationContext has largely replaced BeanFactory, though BeanFactory still exists for backward compatibility.

Since Spring 2.0 and above, the BeanPostProcessor extension point is used extensively. If you use BeanFactory directly, some features such as AOP proxying and transaction management will not work without extra manual configuration.

BeanFactory

BeanFactory is the simplest IoC container. It uses lazy loading − beans are created only when getBean() is called. It provides basic dependency injection support but lacks advanced features like event publishing and annotation-based configuration.

Example

BeanFactory factory = new XmlBeanFactory(
    new ClassPathResource("beans.xml")
);

// Bean is created only at this point (lazy)
MyBean bean = (MyBean) factory.getBean("myBean");

ApplicationContext

ApplicationContext is the more advanced container. It uses eager loading − all singleton beans are instantiated at container startup. It supports annotation-based configuration, event publishing, internationalization, and automatic BeanPostProcessor registration.

Example

ApplicationContext context = new ClassPathXmlApplicationContext(
    "beans.xml"
);

// Bean was already created at startup (eager)
MyBean bean = context.getBean(MyBean.class);

Key Differences

Conclusion

ApplicationContext is the preferred IoC container for most Spring applications as it provides eager loading, annotation support, event publishing, and AOP out of the box. BeanFactory is lighter but lacks these advanced features and is mainly retained for backward compatibility.