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Spring - Interview Questions and Answers for 'L' - 111 question(s) found - Order By Newest

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Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback )
  Q1. Difference between == and .equals() ?Core Java
Anonymous
Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory.

x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object.

Sample code:

String x = new String("str");
String y = new String("str");

System.out.println(x == y); // prints false
System.out.println(x.equals(y)); // prints true

  Sample Code for equals

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Technologies  bebo technologies  Closeloop Technologies  DamcoSoft  Swar Yantra Technologies  SK VedaInfo Universal  Trantor Software  IT HAT Consulting  Kindlebit Solutions  Mann McGlynn  AmrtData Enterprises  Riconz Technologies  Embryo Software Solution  Corporate Stalwarts  Varite  Mirror Consultancy Service  Wing Global IT Service  Regence  Adpearance  IGNW  Centizen  Flexton  Syntel  Kaiser Permanente  SkiData  New Relic  McKesson  Finastra  Pivotal  UST Global  Morgan Stanley  Kroger  Genesys  Guardian Life  SynergisticIT  Leidos  Expeditors Associate  Polycom  Compass  Point ClickCare  Expedia  Equal Experts  Dimentrix  Intellect Design Arena  Epam Systems  Qualys  Instacart  ThoughtWorks  Maxgen Technologies  Aayansh Germinate  Principal Financial Group  NineScript Technologies  Nihilent  infrasoft technologies  e-Zest Solutions  Krawler Inc  FundTech  BNT SOFT  SAPsphinx Infotech  KinderTouch  Accede Software Solutions  LeadLake  Emerson  Xoriant  Citrix  Anonymous Content  GS Lab  Thermax  Saama Technologies  Fresherworld.com  Nityo Infotech  Sanofi  Innoplexus  Sears IT & Management Services   National Stock Exchange of India  Accelya Kale  Tudip Technologies  ITSource Technologies  Sela Technology Solutions  Eternus Solutions  Raja Software Labs  Leo TechnoSoft  Shubham Housing Development Finance  Serene Corporation  Leo Technosoft  Questionpro  Sparken IT Solutions  Capsilon  JetSynthesys  MangoSpring  Subway  Arezzo Sky  Lenco Diagnostic Laboratories  Finlogic Technologies  Maxxton  Cerillion  Applus+  XOYAL  Acloudzyn Technologies  ITYX  Tej IT Solutions  Transworld Compressor Technologies  Deskera  Ebaotech  Kahuna Systems  Kimaya Infotech  SSP Technology  Boston Byte  Bonellisoft  Rack Infotech  Intellection Software and Technologies  OMVSAB IT Solutions  ProductDossier  Soft Infology  Systems Plus Transformations  StackMint  HeadInfotech India  EffortSys  KasNet Technologies  Java City  iSynergy TechSys  Unisoft Technologies  Servient  ThinkQuotient Software  Medline Industries  Ascent Cyber Solutions  Proto-T Solutions  Tinker Technologies  Censhare  Proto-T Solutions  Henx International Technologies  AlightHub Consulting Services  Perpetual Infotech  BestoSys  Infiniti Infosystems  Torqus  Spectrum Tech System  OreInfo  Sanvi Softech  Neptune Solutions  XTime  Web Hub Technology  Coin Technologies  Paramount Pictures  Rocklike DMS  Implant Technosoft Solutions  Nabla Infotech  Predikly  Godwit Technologies  Kanaka Consulting  Aarnum Technologies  Ganesh Kapure  Abhinav Digicompsoft Services  Shoffex.com  Online Training Solutions  A Plus Tree  OMM Software Innovation  Tanish Infotech Solution  Zinist Software  Mobile Sutra  Playpixel Infosystem  SunGuard  Nihilent  Siemens PLM Software  Maxgen Technologies  Nitor Infotech  Mediaocean  Yagna iQ  Sigma Systems  Ethon  The Permanente Medical Group  Reliance Industries  MindCraft Software  ABM Knowledgeware  Trutech Web Solutions  Nikhil R Gupta & Associates  eMeasurematics  NovelERP Solutions  Web Element Solutions  HDFC Bank  Qualcomm  Intellect Design Arena  Diebold Nixdorf  Sharekhan  Pepperfry  IRIS Business Services  Wind World  ZEDO  Loylty Rewardz Mngt  C2L Biz  Chenoa Information Services  Insolutions Global  Vakrangee Softwares  Celusion Technologies  Currencies Direct  Zenith System Solutions  Base Information Management  Exponentia DataLabs  Realty Redefined  Constaccent  Neoquant Solutions  Aureus Analytics  Planfirma Technologies  Pawaa Software  iBhejo  Fairfax County Virginia  American Conservation Experience  Hari Krishna Exports  Core Education & Technologies   Nishat Mills  Industrial Market Place  Krisnela Technologies  Swissclear Global  Samyak Software  Professional Access  Nexstep Infotech  Concerto Software  Viral Technologies  Silverwing Technologies  Gcom Software Inc  Accel Frontline  Atom Technologies  Blue Star Infotech  Cynapse  Datamatics Global Services  Flytxt Mobile Solutions  Persistent Systems  Onmobile Global  Trianz  Sasken  WNS Global Services  Tavant technology  Edz Infomatics      basic        frequent

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Recently asked in TCS , Tech Mahindra, HCL , Accenture and Fidelity.
  Q2. Explain Flow of Spring MVC ?Spring
Admin
info@buggybread.com
Ans. The DispatcherServlet configured in web.xml file receives the request.

The DispatcherServlet finds the appropriate Controller with the help of HandlerMapping and then invokes associated Controller.

Then the Controller executes the logic business logic and then returns ModeAndView object to the DispatcherServlet.

The DispatcherServlet determines the view from the ModelAndView object.

Then the DispatcherServlet passes the model object to the View.

The View is rendered and the Dispatcher Servlet sends the output to the Servlet container.

Finally Servlet Container sends the result back to the user.

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Very frequently asked in HCL Tech ( Based of 4 inputs )
  Q3. Write a Program to reverse a string iteratively and recursivelyCore Java

Ans. Using String method -

new StringBuffer(str).reverse().toString();

Iterative -

Strategy - Loop through each character of a String from last to first and append the character to StringBuilder / StringBuffer

public static String getReverseString(String str){
StringBuffer strBuffer = new StringBuffer(str.length);
for(int counter=str.length -1 ; counter>=0;counter--){
strBuffer.append(str.charAt(counter));
}
return strBuffer;
}

Recursive -

Strategy - Call the method with substring starting from 2nd character recursively till we have just 1 character.

public static String getReverseString(String str){
if(str.length <= 1){
return str;
}
return (getReverseString(str.subString(1)) + str.charAt(0);
}

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 Q4. What are the benefits of using Spring Framework ?Spring
Admin
info@buggybread.com
Ans. Spring enables developers to develop enterprise-class applications using POJOs. The benefit of using only POJOs is that you do not need an EJB container product.

Spring is organized in a modular fashion. Even though the number of packages and classes are substantial, you have to worry only about ones you need and ignore the rest.

Spring does not reinvent the wheel instead, it truly makes use of some of the existing technologies like several ORM frameworks, logging frameworks, JEE, Quartz and JDK timers, other view technologies.

Testing an application written with Spring is simple because environment-dependent code is moved into this framework. Furthermore, by using JavaBean-style POJOs, it becomes easier to use dependency injection for injecting test data.

Spring is web framework is a well-designed web MVC framework, which provides a great alternative to web frameworks such as Struts or other over engineered or less popular web frameworks.

Spring provides a convenient API to translate technology-specific exceptions (thrown by JDBC, Hibernate, or JDO, for example) into consistent, unchecked exceptions.

Lightweight IoC containers tend to be lightweight, especially when compared to EJB containers, for example. This is beneficial for developing and deploying applications on computers with limited memory and CPU resources.

Spring provides a consistent transaction management interface that can scale down to a local transaction

  Sample Code for spring

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Very frequently asked.Usually among first few questions.
  Q5. What is MVC ? Design
Anonymous
Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application

1. Controller receives the requests and handles overall control of the request
2. Model holds majority of the Business logic, and
3. View comprise of the view objects and GUI component

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Try 1 Question(s) Test


 Q6. How can we manage Error Messages in the web application ?Solution
Anonymous
Ans. Within message.properties file.

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 Q7. What bean scopes does Spring support? Explain them.Spring
Admin
info@buggybread.com
Ans. The Spring Framework supports following five scopes -

Singleton
prototype
request
session
global-session

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 Q8. What is the difference between Singleton and Prototype Bean scope in Spring ?Spring2017-08-20 06:35:16

Ans. Prototype scope - A new object is created each time it is injected/looked up. It will use new SomeClass() each time.

Singleton scope - It is the default scope. The same object is returned each time it is injected/looked up. Here it will instantiate one instance of SomeClass and then return it each time.

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 Q9. Write a Program that gets a set of numbers , filters out the non prime numbers , calculate the factorial of each prime number and then finds the average of all factorials using Lambda expressions2017-05-14 14:02:57

Ans. public class BuggyBread1 {
   
   public static void main(String args[]) {
      
      // Declare and Initialize the Collection
      Set<Integer> intSet = new HashSet<Integer>();

      // Add Elements
      intSet.add(1);
      intSet.add(2);
      intSet.add(3);
      intSet.add(4);
      intSet.add(5);

      double averageOfNonPrimeFactorials = intSet.stream().filter(p->checkIfPrime(p)).collect(Collectors.averagingInt(p->calculateFactorial(p)));
      
      System.out.println(averageOfNonPrimeFactorials );
   }
   
   static private boolean checkIfPrime(int num){
      for(int count=2;count < num;count++){
         if(num % count == 0){
            return false;
         }
      }
      return true;
   }
   
   static private int calculateFactorial(int num){
      int factorial = 1;
      for(int count=num;count > 0;count--){
         factorial = factorial * count;
      }
      return factorial;
   }
}

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 Q10. Write a Program for Graph Depth First Traversal using Apache Commons MultiMapAlgorithm2017-07-23 10:01:14

Ans. import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;

public class Graph {
   private static Multimap<Integer,Integer> adjacentDirectedNodesMap = ArrayListMultimap.create();
   private static Set<Integer> alreadyVisited = new HashSet();
   
   static{
      adjacentDirectedNodesMap.put(1, 2);
      adjacentDirectedNodesMap.put(1, 3);
      adjacentDirectedNodesMap.put(1, 5);
      adjacentDirectedNodesMap.put(2, 4);
      adjacentDirectedNodesMap.put(4, 5);
   }
   
   public static void main(String[] args){
      ArrayList visited = new ArrayList();
      
      Integer startNode = 1;
      
      displayAdjacentNodes(startNode);
      
   }
   
   private static void displayAdjacentNodes(Integer integer){
      if(alreadyVisited.contains(integer)){
         return;
      }
      alreadyVisited.add(integer);
      System.out.println(integer);
      for(Integer adjacentNodes: adjacentDirectedNodesMap.get(integer)){
         displayAdjacentNodes(adjacentNodes);
      }
   }
   
}

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 Q11. Write a Program for Graph Breadth First Traversal using Apache Commons MultiMap2017-07-23 10:07:15

Ans. import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;

public class Graph {
   private static Multimap<Integer,Integer> adjacentDirectedNodesMap = ArrayListMultimap.create();
   private static Set<Integer> alreadyVisited = new HashSet();
   
   static{
      adjacentDirectedNodesMap.put(1, 2);
      adjacentDirectedNodesMap.put(1, 3);
      adjacentDirectedNodesMap.put(1, 5);
      adjacentDirectedNodesMap.put(2, 4);
      adjacentDirectedNodesMap.put(4, 5);
   }
   
   public static void main(String[] args){
      ArrayList visited = new ArrayList();
      
      Integer startNode = 1;
      
      displayAdjacentNodes(startNode);
      
   }
   
   private static void displayAdjacentNodes(Integer integer){
      System.out.println(integer);
      for(Map.Entry<Integer, Collection<Integer>> adjacentNodes: adjacentDirectedNodesMap.asMap().entrySet()){
         for(Integer integer1:adjacentNodes.getValue()){
            if(alreadyVisited.contains(integer1)){
               continue;
            }
            alreadyVisited.add(integer1);
            System.out.println(integer1);
         }
      }
   }
   
}

  Sample Code for import java.util.ArrayList; import java.util.Collection; import java.util.HashSet; import java.util.Map; import java.util.Set; import com.google.common.collect.ArrayListMultimap; import com.google.common.collect.Multimap;

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 Q12. Write a program to show thread usage in Java by implementing runnable interface2017-08-03 12:16:07

Ans. public class MyClass {
   static class MyThreadClass implements Runnable{

      public void start() {
         Thread t = new Thread(this,"threadName");
         t.start();
      }
      
      @Override
      public void run() {
         System.out.println("Hello");
         try {
            Thread.sleep(1000);
            System.out.println("Hello Again");
         } catch (InterruptedException e) {
            e.printStackTrace();
         }
         
      }
      
   }
   
   public static void main(String[] args){
      MyThreadClass myThreadClass = new MyThreadClass();
      myThreadClass.start();
      
      MyThreadClass myThreadClass2 = new MyThreadClass();
      myThreadClass2.start();
   }
}

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 Q13. What are different modules of spring ?
Spring
Admin
info@buggybread.com
Ans. There are seven core modules in spring

Spring MVC
The Core container
O/R mapping
DAO
Application context
Aspect Oriented Programming or AOP
Web module

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 Q14. What is Spring configuration file?Spring
Anonymous
Ans. Spring configuration file is an XML file. This file contains the classes information and describes how these classes are configured and introduced to each other.

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 Q15. Q: What is default scope of bean in Spring framework?Spring
Admin
info@buggybread.com
Ans. The default scope of bean is Singleton.

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Very Frequently asked Spring question.
  Q16. What is bean auto wiring?Spring
Admin
info@buggybread.com
Ans. The Spring container is able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for your bean by inspecting the contents of the BeanFactory without using and elements.

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Frequently asked in Phone Interviews.
 Q17. What the Bean scopes provided by Spring ?Spring
Admin
info@buggybread.com
Ans. Singleton , Prototype , Request , Session , global-session

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Frequently asked in Phone Interviews.
 Q18. What are the various Auto Wiring types in Spring ?
Admin
info@buggybread.com
Ans. By Name , By Type and Constructor.

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 Q19. When should we use prototype scope and singleton scope for beans ?Spring
admin
info@buggybread.com
Ans. We should use singleton scope for beans when they are stateless and prototype when they are stateful.

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 Q20. Which web application framework you like and Why ?Framework
Admin
info@buggybread.com
Ans. I like Spring as it comes with inbuilt Dependency Injection framework. It has great online community and support and is proven to work well with ORMs like Hibernate. If we are not working with ORM and DI, Struts 2 is also good.

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 Q21. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?Spring
Admin
info@buggybread.com
Ans. No, if required we should only have final variables.Bean scoped singleton means that only one instance of the bean will be created and will be shared among different requests and hence instance variables will get shared too.

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 Q22. Which of the following Interface needs to be implemented by any object that wishes to be notified of the ApplicationContext that it runs in ?

a. ApplicationContextAware
b. ApplicationContextUtils
c. ApplicationContext
d. Aware
Spring
Anonymous
Ans. ApplicationContextAware

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 Q23. What is Spring Boot ?Spring Boot2016-12-19 06:23:21

Ans. Spring Boot is Springs convention-over-configuration solution for creating stand-alone, production-grade Spring-based Applications.

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 Q24. What is Spring Security ?Spring2017-01-10 09:13:58

Ans. Spring Security is a powerful and highly customizable authentication and access control framework. It is the de facto standard for securing Spring-based applications.

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 Q25. Explain your experience with Java, spring and web services?General2017-01-10 10:40:19

Ans. Have worked on Java 7 and Java 8, In Java 8 , Worked with streams , lambda expression and default methods.

Have worked on both Spring Mvc and Spring Boot, using Spring dependency injection, Rest services , AOP , JDBC and Hibernate integration.

Have worked on Rest services using Spring and Spring Boot. Have worked on SOAP web services too.

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 Q26. Is there any relationship between Web.xml and Spring.xml ?Spring2017-01-11 09:13:48

Ans. No, there is no relationship between web.xml and spring.xml but you have to configure spring.xml in web.xml in order initialize beans when application starts up

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 Q27. What are the advantages of Spring interceptor over Servlet Filters ?Spring2017-01-30 10:30:32

Ans. Spring Interceptor are Spring beans and hence they can inject other beans and can be used with other Spring frameworks concepts like AOP.

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Frequently asked Spring interview question.
 Q28. What are the components of Spring framework ?Spring2017-02-06 11:57:01

Ans. Core: [Core, Bean, Context, Expression Language]

Web: [Web, Portlet, Servlet, etc]

Data Access [JMS, JDBC, etc]

AOP, Aspect

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 Q29. Difference between MultipartResolver setMaxUploadSize and setMaxUploadSizePerFile ?Spring2017-03-09 14:34:30

Ans. setMaxUploadSize is used to set the maximum size of uploads that can be made in a request whereas setMaxUploadSizePerFile sets the maximum size per uploaded file.


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 Q30. What are the different ways in which dependency injection can be done using Spring Framework ?Spring2017-06-23 11:48:58

Ans. Using Constructor and Setters.

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   Like      Discuss      Correct / Improve     spring  dependency injection   inversion of control


 Q31. Difference between constructor and setter injection ?Spring2017-06-23 11:49:27

Ans. 1. In Setter Injection, partial injection of dependencies can possible, means if we have 3 dependencies like int, string, long, then its not necessary to inject all values if we use setter injection. If you are not inject it will takes default values for those primitives1. In constructor injection, partial injection of dependencies cannot possible, because for calling constructor we must pass all the arguments right, if not so we may get error

2. Setter Injection will overrides the constructor injection value, provided if we write setter and constructor injection for the same property [i already told regarding this, hope you remember ] But, constructor injection cannot overrides the setter injected values

3. If we have more dependencies for example 15 to 20 are there in our bean class then, in this case setter injection is not recommended as we need to write almost 20 setters right, bean length will increase. In this case, Constructor injection is highly recommended, as we can inject all the dependencies with in 3 to 4 lines [i mean, by calling one constructor]

4. Setter injection makes bean class object as mutable [We can change ] .Constructor injection makes bean class object as immutable [We cannot change ]

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 Q32. Difference between ApplicationContext and BeanFactory ?Spring2017-06-23 11:50:50

 This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve     ApplicationContext  BeanFactory   ApplicationContext vs BeanFactory        frequent


 Q33. how do you share data between JSP and spring controller using Angular JS ?AngularJS2017-09-07 07:02:47

Ans. For JPS we can use modelAttribute and ModelAndView object to share data between JPS and Controller. In case of Angular JS, the angular js always get data in form of JSON and it can be accessed by REST WS. So the angular js share data with controller in the form of JSON.

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   Like      Discuss      Correct / Improve     angularjs  jsp  spring controller     Axis Bank


 Q34. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?Spring2018-04-03 09:26:22

 This question was recently asked at 'Infosys'.This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve     singleton     Infosys


 Q35. Can we capture the Request body within the interceptor or Filter and perform operations on it ?Spring2018-04-27 12:11:58

Ans. Yes, But with interceptor it will remove the body from the request and then we will have to explicitly add the attributes to the session to forward it to the handler.

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 Q36. What is ViewResolver in Spring MVC ?Spring2018-05-14 07:08:55

Ans. View resolver is used to get view name from Controller and resolve the next view page

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   Like      Discuss      Correct / Improve          1to1help.net


 Q37. What is setter injection ?Spring2018-06-16 08:00:08

Ans. Setter Injection in Spring is a type of dependency injection in which the framework injects the dependent objects into the client using a setter method.

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   Like      Discuss      Correct / Improve     setter injection   dependency injection     HCL Technologies  Infosys


 Q38. Difference between Component-Scan and @Component annotation ? Spring2018-07-04 16:24:28

Ans. @component mark a java class as a bean so that component scan mechanism of spring pick it up and register in IOC container.

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   Like      Discuss      Correct / Improve          Deloitte


 Q39. Can you explain spring boot project Architecture?Spring Boot2018-10-13 09:46:46

 This question was recently asked at 'Naresh i Technologies'.This question is still unanswered. Can you please provide an answer.


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 Q40. Without configure ContextLoaderListenerAnd DispatcherServlet how to run spring MVCApplication?Spring2018-10-13 09:47:06

 This question was recently asked at 'Naresh i Technologies'.This question is still unanswered. Can you please provide an answer.


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