Spring framework

Question 1

What stereotype annotations are there in spring?

Answer 1

• @Component - generic
• @Controller - controller in spring mvc web app
• @Service - class in business layer
• @Repository - class working with spring data repositories
• @Configuration - class with @Beans
• @RestController - specialised controller combining @Controller & @ResponseBody

Question 2

How could you add a bean for test purposes in spring?

Answer 2

• create a @TestConfiguration class
• explicitly @Import into test class as this type of stereotype isn’t picked up by component scanning and so won’t be picked up by other test classes

Question 3

What is IOC in the spring framework?

Answer 3

inversion of control - the ioc container manages the lifecycle of beans in the conxtext, instead of in the app.

Question 4

What is DI in spring?

Answer 4

When the ioc container injects dependencies from the context into the bean via e.g constructor injection.

Question 5

What is component scanning in spring?

Answer 5

• telling spring what paths to look at for picking up annotated classes
• default paths can be defined and packaged excluded

Question 6

What is a Messaging Gateway?

Answer 6

A messaging gateway typically acts as a translation mechanism, abstracting the details of formatting, protocols, and message transfer to enable communication between different systems by ensuring compatibility and understanding on the receiving end.