Accessing Spring Bean Inside A Pojo

Suppose we have a Pojo class MyPojo , which want to access an object from Spring Bean , How can we do that ?

A Simple Approach would be to use ApplicationContextAware Interface of Spring , We can implement this class to return Bean of desired class in Our Pojo.

As We can see Below , we want a Bean of MyBean Class in MyPojo Class , MyBean Class is managed by Spring while MyPojo is managed by developer, So we are using the getBean() method of ApplicationContextAware Interface .

we just need to Pass the class name here and just like that we will get the spring managed object in our Pojo .

class MyPojo{
  MyBean myBean = SpringContext.getBean(MyBeanClass.class);
}

     @Component
public class SpringContext implements ApplicationContextAware {
     
    private static ApplicationContext context;
     
    public static <T extends Object> T getBean(Class<T> beanClass) {
        return context.getBean(beanClass);
    }
 
    @Override
    public void setApplicationContext(ApplicationContext context) throws BeansException {
        setContext(context);
    }     
 
    
    private static synchronized void setContext(ApplicationContext context) {
        SpringContext.context = context;
    }
}

P.S :-

Some of you can think why can’t we directly use Autowired Annotation in the pojo and inject the bean , doing so can give a NPE as Our Pojo is not managed by Spring , its dependencies will not be injected .