1. XML based config file
2. Annotation-based configuration
3. Java-based configuration

XML based config file

<!--?xml version="1.0" encoding="UTF-8"?-->

<!-- A simple bean definition -->

<!-- collaborators and configuration for this bean go here -->

<!-- A bean definition with lazy init set on -->

<!-- collaborators and configuration for this bean go here -->

<!-- A bean definition with initialization method -->

<!-- collaborators and configuration for this bean go here -->

<!-- A bean definition with destruction method -->

<!-- collaborators and configuration for this bean go here -->

<!-- more bean definitions go here -->