10-Spring Overview

Question 1

Is Spring a full J2EE container?

Answer 1

No, it is simply a container for the components (beans) in your application.

Question 2

What are the key principles of Spring framework?

Answer 2

1. Don’t repeat yourself e.g. Spring’s template classes
2. Separation of Concerns e.g. security layer
3. Convention over Configuration: attempt to decrease the number of decisions that a developer using the framework –> work even without writing any configuration files
4. Testability

Question 3

2 benefits of Separation of Concerns?

Answer 3

1. Tight Cohesion: Cohesion is the technical name for well focused code doing a single task.
2. Loose Coupling: Change in one component is isolated from the rest. Changes to not propagate throughout the system.

Question 4

What is a POJO?

Answer 4

“Plain Java” means you write code with no dependencies on third-party frameworks or infrastructure, and minimal dependencies overall