Name some of the Design Patterns used in the Spring Framework?

In the Spring Framework, several design patterns are utilized to enhance the structure, maintainability, and efficiency of Java applications. Here are some of the key design patterns used in Spring:

1. Singleton Pattern: This pattern ensures that a class has only one instance and provides a global point of access to it. In Spring, beans defined in the Spring configuration files are singletons by default, scoped to a single instance per Spring IoC (Inversion of Control) container[1][3][5][7].

2. Factory Pattern: Used extensively in Spring to create beans. The BeanFactory and ApplicationContext in Spring serve as examples of the Factory pattern, providing a way to instantiate beans effectively[1][2][3][4][7].

3. Proxy Pattern: Spring utilizes proxies for aspects such as transactions and security, especially in its AOP (Aspect-Oriented Programming) support. It can use JDK dynamic proxies or CGLIB proxies depending on whether the proxied target implements an interface[1][3][5].

4. Template Method Pattern: This pattern is used in Spring for defining the program skeleton of an algorithm in a method, deferring some steps to subclasses. It is used in various template classes like JdbcTemplate, JmsTemplate, and JpaTemplate[3][5].

5. Dependency Injection (DI) Pattern: Also known as Inversion of Control (IoC), this pattern allows the creation of dependent objects outside of a class and provides those objects to a class in different ways. In Spring, this is achieved through the IoC container[1][4][5].

6. Model-View-Controller (MVC) Pattern: Spring MVC implements this pattern to separate the application into three main asp...