Spring

Question 1

What is Dependency Injection

Answer 1

A design pattern that passes concrete instances during object creation or initialization

Question 2

What are the different cloud models and what do we get in each that we don’t in another.

Answer 2

OnSite: We manage Application, Data, Runtime, O/S, Middleware, Virtualization, Servers, Secutiy, Networking.
IAAS (EC2) : We manage Application, Data, Runtime, O/S, Middleware.
PAAS (Elastic Beanstalk): We manage Application and data
SAAS: everything is provided.

Question 3

What calls the bean lifecycle and what is it?

Answer 3

Make a request to the IOC container
Instantiate object
Populate the properties
setBeanName
setBeanFactory
Preinitialization
CustomInit 
PostInitilization
Then it's ready and in use
Destroy
Custom Destroy

Question 4

Difference between a JoinPoint and a PointCut

Answer 4

A joinpoint is a place where advice can be injected in the method execution. A pointcut is a set of joinpoints and it tells Spring which joinpoints out of the cluster of joinpoints that you want to have that advice given to.

Question 5

Different types of annotations

Answer 5

@Aspect
@Component
@Before
@After
@AfterThrowing
@AfterReturning
@Around

Question 6

What are the beans that we need to configure in Spring ORM

Answer 6

DataSource which holds our DB credentials. This is then injected into the SessionFactory which holds our hibernate specific configurations, and then is injected into either our DAOs or the TransactionManager

Question 7

What does the @Transactional do

Answer 7

This indicates that we want the annotated method to execute in the context of a transaction and we want that transaction managed by Spring.

Question 8

What’s JSR 303?

Answer 8

Bean Validation