SPRING OOF

Question 1

what is spring?

Answer 1

an app framework which focuses on concept of inversion of control containers. essentially a lightweight, integrated framework that can be used for developing enterprise applications in java

Question 2

spring modules

Answer 2

context, AOP, DAO, JDBC, ORM, web module, MVC

Question 3

spring context

Answer 3

for dependency injection

Question 4

spring AOP

Answer 4

for aspect oriented programming

Question 5

spring DAO

Answer 5

for database operations using DAO pattern

Question 6

spring JDBC

Answer 6

for JDBC and DataSource support

Question 7

spring ORM

Answer 7

for ORM tools support such as Hibernate

Question 8

spring Web Module

Answer 8

for creating web apps

Question 9

spring MVC

Answer 9

Model-View-Controller implementations for creating web applications, web services, etc.

Question 10

what does core container focus on

Answer 10

spring beans, core, context, SpEL

Question 11

important annotations in spring configuration

Answer 11

@required, @autowired, @qualifier, @resource, @postconstruct, @predestroy

Question 12

bean

Answer 12

an object that is instantiated, assembled, and MANAGED BY SPRING IOC CONTAINTER

Question 13

what are 5 scopes of bean

Answer 13

singleton, prototype, request, session, global-session

Question 14

bean class

Answer 14

has attributes and getter/setter methods

Question 15

singleton

Answer 15

only single object by default

Question 16

prototype

Answer 16

every time you make a new object it will be new and different

Question 17

request

Answer 17

1 object for entire request

Question 18

session

Answer 18

1 object for entire request

Question 19

global-session

Answer 19

1 object for entire global session

Question 20

how is bean added to spring application?

Answer 20

use bean tag in XML where you add id attribute then value

Question 21

dispatcherservlet

Answer 21

front controller in spring mvc app as it loads spring bean config file and initializes all the beans that have been configured

Question 22

contextloaderlistener

Answer 22

listener to start up and shut down WebApplicationContext in spring root

Question 23

constructor injection

Answer 23

inject dependency through constructor. no partial injection. doesn’t override setter property. creates new instance if any modification occurs. better for too many properties

Question 24

setter injection

Answer 24

inject dependency through a setter method. partial injection. overrides the constructor property if both are defined. doesn’t create new instance if you change property value. better for few properties

Question 25

autowiring

Answer 25

enables programmer to inject the bean automatically. don't need to write explicit injection logic.

Question 26

what are the autowiring modes?

Answer 26

no, byName, byType, constructor

Question 27

no

Answer 27

default mode, means autowiring is not enabled

Question 28

byName

Answer 28

injects bean based on property name. uses setter method

Question 29

byType

Answer 29

injects bean based on property type. uses setter method

Question 30

constructor

Answer 30

injects bean using constructor

Question 31

how to handle exceptions in spring MVC

Answer 31

using controller based, global exception handler, HandlerExceptionResolver

Question 32

Controller Based

Answer 32

can define exception handler methods in our controller classes

Question 33

Global Exception Handler

Answer 33

Exception Handling is a cross-cutting concern and Spring provides

Question 34

HandlerExceptionResolver

Answer 34

Any Spring bean declared in DispatcherServlet's application context that implements HandlerExceptionResolver will be used to intercept and process any exception raised int he MVC system and not handled by a Controller

Question 35

important spring annotations

Answer 35

@Controller, @PathVariable, @Qualifier, @Configuration, @Scope, @RequestMapping, @ResponseBody, @Autowired, @Service, @Aspect