Youtube Link: https://youtu.be/CXTiwkZVoZI ( Microservices Architecture Training: https://www.edureka.co/microservices-architecture-training ) This Edureka's PPT on Spring Boot Interview Questions talks about the top questions asked related to Spring Boot. Follow us to never miss an update in the future. YouTube: https://www.youtube.com/user/edurekaIN Instagram: https://www.instagram.com/edureka_learning/ Facebook: https://www.facebook.com/edurekaIN/ Twitter: https://twitter.com/edurekain LinkedIn: https://www.linkedin.com/company/edureka Castbox: https://castbox.fm/networks/505?country=in

2. Why should you use Spring
Boot?
www.edureka.co

3. Why should you use Spring Boot?
Stability Based
on JVM
Open
Source
Cloud-
Native
Connectivity Flexibility
www.edureka.co

4. Java Spring Boot Developer Salary Trend
www.edureka.co

5. www.edureka.co

6. Spring Boot
Interview Questions
Whatarethedifferencesbetween
SpringandSpringBoot?
Question 1
www.edureka.co

7. Question 1
Whatarethedifferencesbetween
SpringandSpringBoot?
Spring SpringBoot
AwebapplicationframeworkbasedonJava AmoduleofSpring
Providestoolsandlibrariestocreate
customizedwebapplications
UsedtocreateaSpringapplicationproject
whichcanjustrun/execute
SpringismorecomplexthanSpringBoot
SpringBootislesscomplexthantheSpring
framework
Takesanunopinionatedview Takesanopinionatedviewofaplatform
Spring Boot
Interview Questions
www.edureka.co

8. WhatisSpringBootandmention
theneedforit?
Question 2
Spring Boot
Interview Questions
www.edureka.co

9. Question 2
Usedtocreate stand-alone Spring-based applications
whichyoucanjustrun
Spring Boot isaSpringmodulewhichaimstosimplifytheuseofthe
SpringframeworkforJava development.
Spring Boot
Interview Questions
www.edureka.co
❑ Auto-dependencyResolution
❑ EmbeddedHTTPservers
❑ Auto-configuration
❑ Managementendpoints
❑ SpringBootCLI
WhatisSpringBootandmention
theneedforit?
AimsatRapid Application Development
SpringBootframeworkcomeswith

10. WhataretheadvantagesofSpring
Boot?
Question 3
Spring Boot
Interview Questions
www.edureka.co

11. Question 3
Spring Boot
Interview Questions
www.edureka.co
WhataretheadvantagesofSpring
Boot?
Advantages of Spring Boot
01 Provides autoconfiguration to load a set of default configuration for a quick start
of the application
02Creates stand-alone applications with a range of non-functional features that are
common to large classes of project
03 Spring Boot comes with embedded tomcat, servlet containers jetty to avoid the
usage of WAR files
04Spring Boot provides an opinionated view to reduce the developer effort and
simplify maven configurations

12. Question 3
Spring Boot
Interview Questions
www.edureka.co
WhataretheadvantagesofSpring
Boot?
Advantages of Spring Boot
05 Provides CLI tool to develop and test applications
06Comes with Spring Boot starters to ensure dependency management and also
provides various security metrics
07 Consists of a wide range of APIs for monitoring and managing applications in dev
and prod.
08Integrates with Spring Ecosystem like Spring JDBC, Spring ORM, Spring Data,
Spring Security easily by avoiding boilerplate code.

13. MentionafewfeaturesofSpring
Boot
Question 4
Spring Boot
Interview Questions
www.edureka.co

14. Question 4
Spring Boot
Interview Questions
www.edureka.co
MentionafewfeaturesofSpring
Boot
Spring CLISpring CLISpring CLI
SpringBootCLIallowsyou
toGroovyforwritingSpringboot
applicationandavoids
boilerplatecode.
Starter DependencyStarter DependencyStarter Dependency
Withthehelpofthisfeature,
SpringBootaggregatescommon
dependenciestogetherand
eventuallyimprovesproductivity
Spring InitializerSpring InitializerSpring Initializer
Thisisbasicallyaweb
application,whichcan createan
internalprojectstructureforyou.
Auto-configurationAuto-configurationAuto-configuration
Theauto-configurationfeatureof
SpringBoothelpsinloadingthe
defaultconfigurationsaccordingto
theprojectyouareworkingon
Spring ActuatorSpring ActuatorSpring Actuator
Thisfeatureprovideshelpwhile
runningSpringBootapplications.
Logging and SecurityLogging and SecurityLogging and Security
ThisfeatureofSpringBoot,ensures
thatalltheapplicationsmadeusing
SpringBootareproperlysecured
withoutanyhassle.

15. ExplainhowtocreateSpringBoot
applicationusingMaven
Question 5
Spring Boot
Interview Questions
www.edureka.co

16. Question 5
Spring Boot
Interview Questions
www.edureka.co
ExplainhowtocreateSpringBoot
applicationusingMaven
TherearevariousapproachestocreateaSpringBootapplication using
maven:
❑Spring Boot CLI
❑Spring Boot Project Wizard
❑Spring Boot Initializer
❑Spring Maven Project

17. Whatarethethepossiblesources
ofexternalconfiguration?
Question 6
Spring Boot
Interview Questions
www.edureka.co

18. Question 6
Spring Boot
Interview Questions
www.edureka.co
Whatarethethepossiblesources
ofexternalconfiguration?
Application Properties
Command Line Properties
Profile Specific Properties
MostPossibleSourcesOfExternalConfiguration

19. Canyouexplainwhathappensin
thebackgroundwhenaSpringBoot
Applicationis“RunasJava
Application”?
Question 7
Spring Boot
Interview Questions
www.edureka.co

20. Question 7
Spring Boot
Interview Questions
www.edureka.co
Canyouexplainwhathappensin
thebackgroundwhenaSpringBoot
Applicationis“RunasJava
Application”?
WhenaSpring Boot application isexecutedas“Run
as Java application”,thenitautomatically
launches up the tomcat serverassoonasitsees,that
youaredevelopingawebapplication.

21. WhataretheSpringBootstarters
andwhatareavailablethe
starters?
Question 8
Spring Boot
Interview Questions
www.edureka.co

22. Question 8
WhataretheSpringBootstarters
andwhatareavailablethe
starters?
Spring Boot
Interview Questions
www.edureka.co
Spring Boot starters areasetofconvenient dependency
managementproviderswhichcanbeusedintheapplicationtoenable
dependencies. Thesestartersmakedevelopmenteasyandrapid.Allthe
availablestarterscomeunderthe
org.springframework.boot group.

23. Question 8
WhataretheSpringBootstarters
andwhatareavailablethe
starters?
Spring Boot
Interview Questions
www.edureka.co
01 spring-boot-starter
02 spring-boot-starter-jdbc
03 spring-boot-starter-web
04 spring-boot-starter-data-jpa
05 spring-boot-starter-security
06 spring-boot-starter-aop
07 spring-boot-starter-test

24. Question 9
Spring Boot
Interview Questions
www.edureka.co
ExplainSpringActuatorandits
advantages

25. Question 9
ExplainSpringActuatorandits
advantages
Spring Boot
Interview Questions
www.edureka.co
Spring Actuator isacoolfeatureofSpring Boot withthe
helpofwhichyoucanseewhatishappeninginsidearunning
application.
TheSpringActuatorprovidesaveryeasywaytoaccesstheproduction-
readyREST points andfetchallkindsofinformationfromtheweb.
ThesepointsaresecuredusingSpring Security’s content
negotiation strategy.

26. Question 10
Spring Boot
Interview Questions
www.edureka.co
WhatisSpringBootdependency
management?

27. Question 10
Spring Boot
Interview Questions
www.edureka.co
WhatisSpringBootdependency
management?
Spring Boot dependency management isusedtomanage
dependenciesandconfigurationautomaticallywithoutyouspecifyingthe
versionforanyofthatdependencies.

28. Question 11
Spring Boot
Interview Questions
www.edureka.co
Mentiontheminimum
requirementsforaSpringboot
System

29. Question 11
Spring Boot
Interview Questions
www.edureka.co
Mentiontheminimum
requirementsforaSpringboot
System
Spring Boot 2.1.7.Release requires
✓ Java8+
✓ SpringFramework5.1.9+
Explicit Build Support
✓ Maven3.3+
✓ Gradle4.4+
Servlet Container Support
✓ Tomcat9.0–ServletVersion4.0
✓ Jetty9.4– ServletVersion3.1
✓ Undertow2.0–Servlet Version4.0

30. Question 12
Spring Boot
Interview Questions
www.edureka.co
Whatisthymeleafandhowtouse
thymeleaf?

31. Question 12
Spring Boot
Interview Questions
www.edureka.co
Thymeleaf is a server-side Java template engine used
forwebapplications.
Itaims to bringnaturaltemplatefor yourwebapplication andcan integrate
well with Spring Framework and HTML5 Java web
applications.
Whatisthymeleafandhowtouse
thymeleaf?
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-
thymeleaf</artifactId>
</dependency>

32. Question 13
Spring Boot
Interview Questions
www.edureka.co
Canwechangetheportof
embeddedTomcatserverinSpring
Boot?

33. Question 13
Spring Boot
Interview Questions
www.edureka.co
Canwechangetheportof
embeddedTomcatserverinSpring
Boot?
Yes,wecanchangetheportoftheembeddedtomcatserverbyusing
theapplication properties file.
Inthisfile,youhavetoaddapropertyof“server.port”andassignitto
anyportyouwishto.
Forexample,ifyouwanttoassignitto8081,thenyouhavetomention
server.port=8081
Onceyoumentiontheportnumber,theapplicationpropertiesfilewill
beautomaticallyloadedbySpringBootandtherequired
configurationswillbeappliedontotheapplication.

34. Question 14
Spring Boot
Interview Questions
www.edureka.co
WhatistheneedforSpringBoot
DevTools?

35. Question 14
Spring Boot
Interview Questions
www.edureka.co
Spring Boot Dev Tools isanelaboratedsetoftools
andaimstomaketheprocessofdevelopinganapplicationeasier.
Iftheapplicationrunsintheproduction,thenthismoduleis
automaticallydisabled,repackagingofarchivesarealso
excludedbydefault.
So,theSpring Boot Developer Tools applies
propertiestotherespectivedevelopmentenvironments.
WhatistheneedforSpringBoot
DevTools?

36. Question 14
Spring Boot
Interview Questions
www.edureka.co
WhatistheneedforSpringBoot
DevTools?

37. Question 14
Spring Boot
Interview Questions
www.edureka.co
Spring Boot Dev Tools isanelaboratedsetoftoolsandaims
tomaketheprocessofdevelopinganapplicationeasier.
Iftheapplicationrunsintheproduction,thenthismoduleisautomatically
disabled,repackagingofarchivesarealsoexcludedbydefault.
WhatistheneedforSpringBoot
DevTools?
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-
thymeleaf</artifactId>
</dependency>

39. Question 15
Spring Boot
Interview Questions
www.edureka.co
Mentionthestepstocreatea
SpringBootprojectusing
Spring Initializer

40. Question 15
Spring Boot
Interview Questions
www.edureka.co
Spring Initializer isawebtoolprovidedbySpring.Withthe
helpofthistool,youcancreateSpringBootprojectsbyjust
providingprojectdetails.
Mentionthestepstocreatea
SpringBootprojectusing
Spring Initializer

41. Question 15
Spring Boot
Interview Questions
www.edureka.co
Mentionthestepstocreatea
SpringBootprojectusing
Spring Initializer
✓ Choose the maven project and the required dependencies. Then, fill
the other required details like Group, Artifact, and then click on
GenerateProject.
✓ Once the project is downloaded, extract the project on to your
system
✓ Next, you have to import this project using the import option on the
SpringToolSuiteIDE

42. Question 16
Spring Boot
Interview Questions
www.edureka.co
Mentionthestepstoconnect
SpringBootapplicationtoa
databaseusingJDBC

43. Question 16
Spring Boot
Interview Questions
www.edureka.co
SpringBootstarterprojectsprovidetherequiredlibrariesto
connecttheapplicationwithJDBC.
So,forexample,ifyoujusthavetocreateanapplication and
connectitwithMYSQLdatabase,youcanfollowthebelowsteps:
Mentionthestepstoconnect
SpringBootapplicationtoa
databaseusingJDBC
Step 1: Create a database in MySQL
CREATE DATABASE example;
Step 2: Create a table inside this database
CREATE TABLE customers(customerid INT PRIMARY KEY
NOT NULL AUTO_INCREMENT, customername
VARCHAR(255));

44. Question 16
Spring Boot
Interview Questions
www.edureka.co
Mentionthestepstoconnect
SpringBootapplicationtoa
databaseusingJDBC
Step 3: Create a Spring Boot project and provide
the required details
Step 4: Add JDBC, MySQL and web dependencies.
spring.datasource.url=jdbc:mysql://localhost:3306/e
xample
spring.datasource.username=root
spring.datasource.password=mysql
spring.jpa.hibernate.ddl-auto=create-drop
Step 5: Once the project is created, you have to
configure the database into application
properties.

45. Question 16
Spring Boot
Interview Questions
www.edureka.co
Mentionthestepstoconnect
SpringBootapplicationtoa
databaseusingJDBC
Step 6: The main application.java class should have
the following code:
package com.edureka;
import org.springframework.boot.SpringApplication;
import
org.springframework.boot.autoconfigure.SpringBootAp
plication;
@SpringBootApplication
public class SampleApplication {
public static void main(String[] args) {
SpringApplication.run(SampleApplication.class,
args);
}
}

46. Question 16
Spring Boot
Interview Questions
www.edureka.co
Mentionthestepstoconnect
SpringBootapplicationtoa
databaseusingJDBC
Step 7: You have to create a controller to handle
the HTTP requests, by mentioning the following
code:
package com.edureka;
Import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class JdbcController {
@Autowired
JdbcTemplate jdbc;
@RequestMapping("/insert")
public String index(){
jdbc.execute("insert into customers(name)values('Aryya')");
return "Data Entry Successful";
}
}

47. Question 16
Spring Boot
Interview Questions
www.edureka.co
Mentionthestepstoconnect
SpringBootapplicationtoa
databaseusingJDBC
Step 8: Finally execute this project as a Java
application.
Step 9: Open the URL (localhost:8080/insert), and you
will see the output as data entry successful.
You can also go forward and check if the data is
entered into the table.

48. Question 17
Spring Boot
Interview Questions
www.edureka.co
HowtoenableHTTP/2supportin
SpringBoot

49. Question 17
Spring Boot
Interview Questions
www.edureka.co
HowtoenableHTTP/2supportin
SpringBoot
YoucanenabletheHTTP/2supportinSpringBootby:
server.http2.enabled=true

50. Question 18
Spring Boot
Interview Questions
www.edureka.co
Whatarethe
@RequestMapping and
@RestControllerannotationin
SpringBootusedfor?

51. Question 18
Spring Boot
Interview Questions
www.edureka.co
Whatarethe
@RequestMapping and
@RestControllerannotationin
SpringBootusedfor?
✓ Thisannotationisusedtoprovidetheroutinginformationandtellsto
SpringthatanyHTTPrequestmustbemappedtotherespective
method.
✓ Tousethisannotation,youhavetoimport
org.springframework.web.bind.annotation.RequestMapping;
@RequestMapping@RequestMapping
✓ Thisannotationisusedtoprovidetheroutinginformationandtellsto
SpringthatanyHTTPrequestmustbemappedtotherespective
method.
✓ Tousethisannotation, youhavetoimport
org.springframework.web.bind.annotation.RequestMapping;
@RestController@RestController

52. Question 18
Spring Boot
Interview Questions
www.edureka.co
Whatarethe
@RequestMapping and
@RestControllerannotationin
SpringBootusedfor?
package com.edureka;
import
org.springframework.web.bind.annotation.RequestMapp
ing;
import
org.springframework.web.bind.annotation.RestControl
ler;
@RestController
public class SampleController {
@RequestMapping("/example")
public String example(){
return"Welcome To Edureka";
}
}
Consideryouhaveamethodexample()whichshouldmapwith/exampleURL.

53. Question 19
Spring Boot
Interview Questions
www.edureka.co
WhatisSpringBootCLIandhowto
executetheSpringBootproject
usingbootCLI?

54. Question 19
Spring Boot
Interview Questions
www.edureka.co
SpringBootCLIisatoolsupportedbytheofficial SpringFramework.The
stepstoexecuteaSpringBootprojectareasfollows:
➢ DownloadtheCLItoolfromtheofficialsiteandextractthezipfile.The
binfolderpresentintheSpringsetupisusedtoexecutetheSpring
Bootapplication.
➢ SinceSpringBootCLIexecutesgroovyfiles,youneedtocreatea
groovyfileforSpringBootapplication.So,todothat,openterminaland
changethecurrentdirectorytobinfolder.
WhatisSpringBootCLIandhowto
executetheSpringBootproject
usingbootCLI?

55. Question 19
Spring Boot
Interview Questions
www.edureka.co
Createacontrollerasfollows:
WhatisSpringBootCLIandhowto
executetheSpringBootproject
usingbootCLI?
@RestController public class Sample {
@RequestMapping("/example")
String index(){
<h1>"Welcome To Edureka"</h1>;
} }
Executethegroovyfilebymentioning
./spring run Sample.groovy;

56. Question 20
Spring Boot
Interview Questions
www.edureka.co
Whatarethedifferencesbetween
JPAandHibernate?

57. Question 20
Spring Boot
Interview Questions
www.edureka.co
Whatarethedifferencesbetween
JPAandHibernate?
JPAisaDataAccessAbstractionusedtoreducetheamountofboilerplate
code
JPAJPA
HibernateisanimplementationofJavaPersistenceAPIandoffers
benefitsofloosecoupling
HibernateHibernate
V/S

58. Howcanwecreateacustom
endpointinSpringBootActuator?
Question 21
Spring Boot
Interview Questions
www.edureka.co

59. Question 21
Spring Boot
Interview Questions
www.edureka.co
TocreateacustomendpointinSpringBoot2.x,youcanusethe
@Endpoint annotation.
SpringBootalsoexposesendpointsusing@WebEndpointor,
@WebEndpointExtensionoverHTTPwiththehelp
ofSpringMVC,Jerseyetc.
Howcanwecreateacustom
endpointinSpringBootActuator?

60. WhatdoyouunderstandbySpring
Data?
Question 22
Spring Boot
Interview Questions
www.edureka.co

61. Question 22
Spring Boot
Interview Questions
www.edureka.co
Spring Data aimstomakeiteasyforthedeveloperstouse
relationalandnon-relationaldatabases,cloud-baseddataservices,
andotherdataaccesstechnologies.
So,basically,itmakesiteasyfordataaccessandstillretainsthe
underlyingdata.
WhatdoyouunderstandbySpring
Data?

62. Whatdoyouunderstandbyauto-
configurationinSpringBootand
howtodisablethe auto-
configuration
Question 23
Spring Boot
Interview Questions
www.edureka.co

63. Question 23
Spring Boot
Interview Questions
www.edureka.co
Auto-configuration isusedtoautomaticallyconfigurethe
requiredconfigurationfortheapplication.
Forexample,ifyouhaveadatasourcebeanpresentintheclasspathof
theapplication,thenitautomaticallyconfigurestheJDBCtemplate.
Withthehelpofauto-configuration,youcancreateaJavaapplication
inaneasyway,asitautomaticallyconfigurestherequiredbeans,
controllers,etc.
Whatdoyouunderstandbyauto-
configurationinSpringBootand
howtodisablethe auto-
configuration

64. Question 23
Spring Boot
Interview Questions
www.edureka.co
Todisabletheauto-configuration property,youhaveto
excludeattributeof @EnableAutoConfiguration,inthe
scenariowhereyoudonotwantittobeapplied.
Whatdoyouunderstandbyauto-
configurationinSpringBootand
howtodisablethe auto-
configuration
@EnableAutoConfiguration(exclude={DataSourceAutoConfig
uration.class})
Iftheclassisnotontheclasspath,thentoexcludetheauto-
configuration,youhavetomentionthefollowingcode:
@EnableAutoConfiguration(excludeName={Sample.class})

65. Question 23
Spring Boot
Interview Questions
www.edureka.co
Whatdoyouunderstandbyauto-
configurationinSpringBootand
howtodisablethe auto-
configuration
Apartfromthis,SpringBootalsoprovidesthefacilitytoexcludelistof
auto-configurationclassesbyusingthespring.autoconfigure.exclude
property.Youcangoforward,andadditeitherintothe
application.properties oraddmultipleclasseswithcomma-separated.

66. Whatarethedifferencesbetween
@SpringBootApplication and
@EnableAutoConfiguration
annotation?
Question 24
Spring Boot
Interview Questions
www.edureka.co

67. Question 24
Spring Boot
Interview Questions
www.edureka.co
Whatarethedifferencesbetween
@SpringBootApplication and
@EnableAutoConfiguration
annotation?
✓ Usedinthemainclassorbootstrapclass
✓ Itisacombinationof@Configuration,@ComponentScan and
@EnableAutoConfiguration annotations.
@SpringBootApplication@SpringBootApplication
✓ Usedtoenableauto-configuration andcomponentscanninginyour
project
✓ Itisacombinationof@Configurationand@ComponentScan
annotations
@EnableAutoConfiguration@EnableAutoConfiguration
V/S

68. WhatarethestepstodeploySpring
BootwebapplicationsasJARand
WARfiles?
Question 25
Spring Boot
Interview Questions
www.edureka.co

69. Question 25
Spring Boot
Interview Questions
www.edureka.co
✓ TodeployaSpringBootwebapplication,youjusthavetoaddthe
followingplugininthepom.xmlfilein,justaddapluginelement
topom.xml:
@SpringBootApplication@SpringBootApplication
WhatarethestepstodeploySpring
BootwebapplicationsasJARand
WARfiles?
@<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>

70. Question 25
Spring Boot
Interview Questions
www.edureka.co
✓ Thepackagingelementinthepom.xmlfilemustbesettojartobuilda
JARfileasbelow:
@SpringBootApplication@SpringBootApplication
WhatarethestepstodeploySpring
BootwebapplicationsasJARand
WARfiles?
<packaging>jar</packaging>
<packaging>war</packaging>

71. Canyougiveanexamplefor
ReadOnlyastrueinTransaction
management?
Question 26
Spring Boot
Interview Questions
www.edureka.co

72. Question 26
Spring Boot
Interview Questions
www.edureka.co
Considerascenario,whereyouhavetoreaddatafromthedatabase.
Forexample,letussayyouhaveacustomerdatabase,andyouwantto
readthecustomerdetailssuchascustomerID,customername,and
customeremailID.
Todothat,youwillsetread-onlyonthetransactionaswedonotwantto
checkforthechangesintheentities.
Canyougiveanexamplefor
ReadOnlyastrueinTransaction
management?

73. Canyouexplainhowtodeploytoa
different serverwithSpringBoot?
Question 27
Spring Boot
Interview Questions
www.edureka.co

74. Spring Boot
Interview Questions
www.edureka.co
TodeployadifferentserverwithSpringBoot,followthebelowsteps:
Canyouexplainhowtodeploytoa
different serverwithSpringBoot?
Question 27
01 GenerateaWARfromtheproject
02 DeploytheWARfileontoyourfavouriteserver
Question 27

75. Whatisthebestwaytoexpose
customapplicationconfiguration
withSpringBoot?
Question 28
Spring Boot
Interview Questions
www.edureka.co

76. Spring Boot
Interview Questions
www.edureka.co
OnewaytoexposethecustomapplicationconfigurationinSpringBootis
byusingthe@Value annotation.
But,theonlyproblemwiththisannotationisthatalltheconfiguration
valueswillbedistributedthroughouttheapplication.
Instead,youcanuseacentralized approach.
Bycentralizedapproach,Imeanthatyoucandefineaconfiguration
componentusingthe@ConfigurationProperties asfollows:
Question 28
Whatisthebestwaytoexpose
customapplicationconfiguration
withSpringBoot?
<packaging>@Component
@ConfigurationProperties("example")
public class SampleConfiguration {
private int num;
private boolean value;
private String msg;</packaging>

77. Spring Boot
Interview Questions
www.edureka.co
Accordingtotheabovesnippet,thevaluesconfiguredin
application.properties willbeasfollows:
Question 28
Whatisthebestwaytoexpose
customapplicationconfiguration
withSpringBoot?
example.num: 100
example.value: true
example.msg: Dynamic Message

78. Canwecreateanon-web
applicationinSpringBoot?
Question 29
Spring Boot
Interview Questions
www.edureka.co

79. Spring Boot
Interview Questions
www.edureka.co
Question 29
Canwecreateanon-web
applicationinSpringBoot?
Yes,wecancreate a non-web applicationbyremovingthe
webdependenciesfromclasspathalongwithchangingthewaySpring
Boot creates the application context.

81. Whatarethestepstoconnectan
externaldatabaselikeMySQLor
Oracle?
Question 30
Spring Boot
Interview Questions
www.edureka.co

82. Spring Boot
Interview Questions
www.edureka.co
Question 30
Toconnectanexternaldatabase,youhavetofollowthebelowsteps:
➢ StartbyaddingthedependencyforMySQLConnectortopom.xml
➢ ThenremoveH2Dependencyfrompom.xml
➢ Now,setupyourMySQLdatabaseandconfigureyourconnectiontothe
MySQLdatabase
➢ Restartyourproject
Whatarethestepstoconnectan
externaldatabaselikeMySQLor
Oracle?

83. MentiontheadvantagesofYAML
filethanPropertiesfileandthe
different waystoloadYAMLfilein
Springboot
Question 31
Spring Boot
Interview Questions
www.edureka.co

84. Spring Boot
Interview Questions
www.edureka.co
Question 31 TheadvantagesoftheYAMLfilethanapropertiesfileisthatthedatais
storedinahierarchicalformat.
So,itbecomesveryeasyforthedeveloperstodebugifthereisanissue.
TheSpringApplicationclasssupportstheYAMLfileasanalternative to
propertieswheneveryouusetheSnakeYAMLlibraryonyourclasspath.
The different ways to load a YAML file in Spring
Boot is as follows:
➢ UseYamlMapFactoryBeantoloadYAMLasaMap
➢ UseYamlPropertiesFactoryBean toloadYAMLasProperties
MentiontheadvantagesofYAML
filethanPropertiesfileandthe
different waystoloadYAMLfilein
Springboot

85. HowisHibernatechosenasthe
defaultimplementationforJPA
withoutanyconfiguration?
Question 32
Spring Boot
Interview Questions
www.edureka.co

86. Spring Boot
Interview Questions
www.edureka.co
Question 32
WhenweusetheSpring Boot Auto Configuration,
automaticallythespring-boot-starter-data-
jpadependencygetsaddedtothepom.xmlfile.
Now,sincethisdependencyhasatransitivedependencyonJPAand
Hibernate,Spring Boot automatically auto-
configures Hibernate as the default
implementation for JPA,wheneveritseesHibernatein
theclasspath.
HowisHibernatechosenasthe
defaultimplementationforJPA
withoutanyconfiguration?

87. WhatdoyouunderstandbySpring
DataREST?
Question 33
Spring Boot
Interview Questions
www.edureka.co

88. Spring Boot
Interview Questions
www.edureka.co
Question 33
Spring Data REST isusedtoexposetheRESTfulresources
aroundSpringDatarepositories.
Considerthefollowingexample:
WhatdoyouunderstandbySpring
DataREST?
@RepositoryRestResource(collectionResourceRel =
"sample", path = "sample")
public interface SampleRepository
extends CustomerRepository<sample, Long> {

89. Spring Boot
Interview Questions
www.edureka.co
Question 33
WhatdoyouunderstandbySpring
DataREST?
ToexposetheRESTservices,youcanusethePOSTmethodinthe
followingway:
{
"customerid": "Rohit",
"customeremailid": "customer1@abc.com"
}
ResponseContent:
{
"customerid": "Rohit",
"customeremailid": "customer1@abc.com",
"_links": {
"self": {
"href": "http://localhost:8080/sample/1"
},
"sample": {
"href": "http://localhost:8080/sample/1"
}}

90. Whatisthedifferencebetween
RequestMappingandGetMapping?
Question 34
Spring Boot
Interview Questions
www.edureka.co

91. Spring Boot
Interview Questions
www.edureka.co
Question 34
The@GetMappingisacomposedannotationthatactsasashortcut
for@RequestMapping(method =RequestMethod.GET).
Boththesemethodssupporttheconsumes.Theconsumeoptionsare:
consumes=“text/plain”
consumes={“text/plain”,“application/*”}
Whatisthedifferencebetween
RequestMappingandGetMapping?

92. Inwhichlayer,shouldtheboundary
ofatransactionstart?
Question 35
Spring Boot
Interview Questions
www.edureka.co

93. Spring Boot
Interview Questions
www.edureka.co
Question 35
Theboundary of the transaction shouldstartfromthe
ServiceLayersincethelogicforthebusinesstransactionispresentin
thislayeritself.
Inwhichlayer,shouldtheboundary
ofatransactionstart?

94. Howdoespath=”sample”,
collectionResourceRel=”sample”
workwithSpringDataRest?
Question 36
Spring Boot
Interview Questions
www.edureka.co

95. Spring Boot
Interview Questions
www.edureka.co
Question 36
Howdoespath=”sample”,
collectionResourceRel=”sample”
workwithSpringDataRest?
@RepositoryRestResource(collectionResourceRel =
"sample", path = "sample")
public interface SampleRepository extends
PagingAndSortingRepository<Sample, Long>
➢ path – This section is used to mention the segment under
whichtheresourceistobeexported.
➢ collectionResourceRel – This value is used to
generatelinkstothecollectionresource.

96. Question 37
Spring Boot
Interview Questions
www.edureka.co
Explainhowtoregisteracustom
auto-configuration.

97. Spring Boot
Interview Questions
www.edureka.co
Question 37
Explainhowtoregisteracustom
auto-configuration.
Inordertoregisteranauto-configurationclass,youhavetomention
the fully-qualified name underthe
@EnableAutoConfiguration key META-
INF/spring. factories file.
Also,ifwebuildthewithmaven,thenthisfileshouldbeplacedinthe
resources/META-INT directory.

98. Question 38
Spring Boot
Interview Questions
www.edureka.co
HowdoyouConfigureLog4jfor
logging?

99. Spring Boot
Interview Questions
www.edureka.co
Question 38
SinceSpringBootsupports Log4j2 for logging a
configuration,youhavetoexclude Logback and
include Log4j2 for logging.Thiscanbeonlydoneifyouare
usingthestartersproject.
HowdoyouConfigureLog4jfor
logging?

100. Question 39
Spring Boot
Interview Questions
www.edureka.co
Mentionthedifferencesbetween
WARandembeddedcontainers

101. Spring Boot
Interview Questions
www.edureka.co
Question 39
HowdoyouConfigureLog4jfor
logging?
WARbenefitsaconsiderablemeasurefromSpringBoot
WARWAR
OnlyonecomponentofSpringBootandisutilizedduringimprovements
EmbeddedContainersEmbeddedContainers
V/S

102. Question 40
Spring Boot
Interview Questions
www.edureka.co
Whatdoyouthinkistheneedfor
Profiles?

103. Spring Boot
Interview Questions
www.edureka.co
Question 40
ProfilesinSpringprovidesawaytosegregatethepartsofthe
applicationconfigurationandmakesitavailableinenvironments.So,
basically,any@Component or a @Configuration can
bemarkedwitha@Profiletolimitasitisloaded.
Whatdoyouthinkistheneedfor
Profiles?

104. Question 41
Spring Boot
Interview Questions
www.edureka.co
Whatdoyouthinkistheneedfor
Profiles?

105. Spring Boot
Interview Questions
www.edureka.co
Question 41 ThestepstoaddacustomJScodewithSpringBootareas
follows:
✓ Createafoldercalledstaticundertheresourcesfolder
✓ Inthisfolder,youcanputthestaticcontentinthatfolder
Whatarethestepstoaddacustom
JScodewithSpringBoot?
Note:Justincase,thebrowserthrowsanunauthorizederror,youeither
disablethesecurityorsearchforthepasswordinthelogfile,andeventually
passitintherequestheader.

106. Question 42
Spring Boot
Interview Questions
www.edureka.co
Howtoinstructanauto-
configurationtobackoffwhena
beanexists?

107. Spring Boot
Interview Questions
www.edureka.co
Question 42
Toinstructanauto-configuration classtobackoffwhenabean
exists,youhavetousethe
@ConditionalOnMissingBean annotation.
Theattributesofthisannotationareasfollows:
➢ value:Thisattributestoresthetypeofbeanstobechecked
➢ name:Thisattributestoresthenameofbeanstobechecked
Howtoinstructanauto-
configurationtobackoffwhena
beanexists?

108. Question 43
Spring Boot
Interview Questions
www.edureka.co
WhyisSpringDataRESTnot
recommendedinreal-world
applications?

109. Spring Boot
Interview Questions
www.edureka.co
Question 43 Spring Data REST isnotrecommendedinreal-world
applicationsasyouareexposingyourdatabaseentities directly
asRESTservices.
WhiledesigningRESTfulservices,thetwomostimportantthingsthat
weconsideristhedomainmodelandtheconsumers.
But,whileusingSpringDataREST,noneoftheseparametersare
considered.Theentitiesaredirectlyexposed.
UseSpringDataREST,for the initial evolution of the
project.
WhyisSpringDataRESTnot
recommendedinreal-world
applications?

110. Question 44
Spring Boot
Interview Questions
www.edureka.co
Whatistheerroryouseeif H2is
notintheclasspath?

111. Spring Boot
Interview Questions
www.edureka.co
Question 44
IfH2isnotpresentintheclasspath,thenyouseethefollowing
error:
Whatistheerroryouseeif H2is
notintheclasspath?
Cannot determine embedded database driver class for
database type NONE

112. Spring Boot
Interview Questions
www.edureka.co
Question 44
Whatistheerroryouseeif H2is
notintheclasspath?
Toresolvethiserror,addH2tothepom.xmlfile,andrestartyour
server.
Thefollowingcodesnippetcanbeaddedtoaddthedependency:
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>

114. Question 45
Spring Boot
Interview Questions
www.edureka.co
Whatisthewaytouseprofilesto
configuretheenvironment-
specificconfigurationwithSpring
Boot?

115. Spring Boot
Interview Questions
www.edureka.co
Question 45
Whatisthewaytouseprofilesto
configuretheenvironment-
specificconfigurationwithSpring
Boot?
Since its a known fact that a Profile is nothing but a key to identify
an environment lets consider the following two profiles in the
example:
•dev
•Prod
Consider the following properties present in the application
propertiesfile:
example.number: 100
example.value: true
example.msg: Dynamic Message

116. Spring Boot
Interview Questions
www.edureka.co
Question 45
Whatisthewaytouseprofilesto
configuretheenvironment-
specificconfigurationwithSpring
Boot?
Now, say you want to customize the application.properties for dev
profile, then you need to create a file with name application-
dev.properties and override the properties that you want to
customize.
Youcanmentionthefollowingcode:
example.msg: Dynamic Message in Dev
Similarly,ifyouwanttocustomizetheapplication.properties forprod
profile,thenyoucanmentionthefollowingcodesnippet:
example.msg: Dynamic Message in Prod

117. Spring Boot
Interview Questions
www.edureka.co
Question 45
Whatisthewaytouseprofilesto
configuretheenvironment-
specificconfigurationwithSpring
Boot?
Once you are done with the profile-specific configuration, you
havetosettheactive profileinanenvironment.
Todothat, either youcan:
✓ Use-Dspring.profiles.active=prod in arguments
✓ Usespring.profiles.active=prodinapplication.propertiesfile

118. Question 46
Spring Boot
Interview Questions
www.edureka.co
Mentionthedependenciesneeded
tostartupaJPAApplicationand
connecttoin-memorydatabaseH2
withSpringBoot?

119. Spring Boot
Interview Questions
www.edureka.co
Question 46
Mentionthedependenciesneeded
tostartupaJPAApplicationand
connecttoin-memorydatabaseH2
withSpringBoot?
web starter
H2
data JPA starter
ThedependenciesareneededtostartupaJPAApplicationandconnect
toin-memorydatabaseH2withSpringBoot

120. Spring Boot
Interview Questions
www.edureka.co
Question 46
Mentionthedependenciesneeded
tostartupaJPAApplicationand
connecttoin-memorydatabaseH2
withSpringBoot?
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-
jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>

121. Question 47
Spring Boot
Interview Questions
www.edureka.co
WhatdoyouunderstandbySpring
Bootsupportsrelaxedbinding?

122. Spring Boot
Interview Questions
www.edureka.co
Question 47
WhatdoyouunderstandbySpring
Bootsupportsrelaxedbinding?
Relaxed binding,isawayinwhich,thepropertynamedoesnot
needtomatchthekeyoftheenvironmentproperty.
InSpringBoot,relaxedbindingisapplicabletothetype-safebindingof
theconfigurationproperties.

123. Spring Boot
Interview Questions
www.edureka.co
Question 47
WhatdoyouunderstandbySpring
Bootsupportsrelaxedbinding?
Forexample,ifapropertyinabeanclasswiththe
@ConfigurationProperties annotationisused
sampleProp,thenitcanbeboundedtoanyofthefollowingenvironment
properties:
❑sampleProp
❑sample_Prop
❑sample_Prop
❑SAMPLE_PROP

124. Question 48
Spring Boot
Interview Questions
www.edureka.co
Whereisthedatabaseconnection
informationspecifiedandhowdoes
itautomaticallyconnecttoH2?

125. Spring Boot
Interview Questions
www.edureka.co
Question 48
Whereisthedatabaseconnection
informationspecifiedandhowdoes
itautomaticallyconnecttoH2?
ItisbecauseoftheSpring Boot Autoconfiguration
that,configuresthedependenciesoftheapplication.
So,thedatabaseconnection information,andautomaticallyconnecting
thedatabasetoH2isdonebytheauto-configurationproperty.

126. Question 49
Spring Boot
Interview Questions
www.edureka.co
WhatisthenameofthedefaultH2
databaseconfiguredbySpring
Boot?

127. Spring Boot
Interview Questions
www.edureka.co
Question 49
WhatisthenameofthedefaultH2
databaseconfiguredbySpring
Boot?
ThenameofthedefaultH2databaseistestdb
spring.datasource.name=testdb # Name of the
datasource.
Note:Justin-caseifyouareusingH2in-memorydatabase,thenexactly
thatisthenameofSpringBootwhichisusedtosetupyourH2database.

128. Question 50
Spring Boot
Interview Questions
www.edureka.co
Doyouthink,youcanusejetty
insteadoftomcatinspring-boot-
starter-web?

129. Spring Boot
Interview Questions
www.edureka.co
Question 50
Yes,wecanusejettyinsteadoftomcatinspring-boot-starter-web,by
removingtheexistingdependencyandincludingthefollowing:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-
tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-
jetty</artifactId>
</dependency>
Doyouthink,youcanusejetty
insteadoftomcatinspring-boot-
starter-web?

130. www.edureka.co