Using BeanFactoryAware and FactoryBean in Spring Boot

Introduction :

In Spring Boot, BeanFactoryAware and FactoryBean<Object> are two interfaces that provide additional capabilities for managing beans within the Spring context. BeanFactoryAware allows beans to interact programmatically with the container, while FactoryBean<Object> allows for custom logic when creating beans. In this tutorial, we’ll explore how to use these interfaces with examples in a Spring Boot application.

2. Creating a BeanFactoryAware Bean

To create a BeanFactoryAware bean, you need to implement the interface and override the setBeanFactory method to receive the reference to the BeanFactory.

In this example, MyBean implements BeanFactoryAware and receives the BeanFactory reference through the setBeanFactory method.

3. Introduction to FactoryBean<Object>

FactoryBean<Object> is an interface used to create and configure instances of a specific type. It serves as a factory for creating objects of a certain type within the Spring container.

4. Creating a FactoryBean<Object>

To create a FactoryBean<Object>, you need to implement the interface and override the getObject method to create and configure the target object.

In this example, MyFactoryBean implements FactoryBean<Object> and provides custom logic in the getObject method to create and configure the target object.

5. Example: Using Both Interfaces in Spring Boot

Let’s create an example Spring Boot application that demonstrates the usage of both BeanFactoryAware and FactoryBean<Object>.

In this example, we have:

• MyBean implementing BeanFactoryAware to receive a reference to the BeanFactory.
• MyFactoryBean implementing FactoryBean<Object> to create and configure instances of MyObject.
• MyApp class using both MyBean and MyObject to demonstrate their usage.

6. Conclusion

In this tutorial, you learned how to use BeanFactoryAware and FactoryBean<Object> in a Spring Boot application. These interfaces provide additional capabilities for managing beans within the Spring context, allowing for more flexibility and customization in your application. By following the examples provided, you can easily integrate and use BeanFactoryAware and FactoryBean<Object> in your own Spring Boot projects.