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Spring - Interview Questions and Answers for 'L' - 43 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 ) and Epam Systems
  Q1. Difference between == and .equals() ?Core Java
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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   Like         Discuss         Correct / Improve     java   string comparison   string   object class   ==    equals   object equality  operator   == vs equals   equals vs ==     Asked in 294 Companies      basic        frequent
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Recently asked in TCS , Tech Mahindra, HCL , Accenture and Fidelity.
  Q2. Explain Flow of Spring MVC ?Spring
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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   Like         Discuss         Correct / Improve     j2ee   spring   mvc   frameworks   web applications   architecture     Asked in 11 Companies      Basic        frequent

Very frequently asked.Usually among first few questions.
  Q3. What is MVC ? Design
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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   Like         Discuss         Correct / Improve     j2ee   mvc   mvc design pattern   design pattern   struts   spring   web application   web frameworks   ebay     Asked in 60 Companies      basic        frequent
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 Q4. What are the benefits of using Spring Framework ?Spring
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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   Like         Discuss         Correct / Improve     java   spring framework   mvc   spring container   architecture   technical architect   java architect   technical lead  ioc     Asked in 2 Companies      basic        frequent

 Q5. What is the difference between Singleton and Prototype Bean scope in Spring ?Spring
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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   Like         Discuss         Correct / Improve     Spring beans  singleton bean scope  prototype bean scope     Asked in 1 Companies

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

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 Q7. What bean scopes does Spring support? Explain them.Spring
Ans. The Spring Framework supports following five scopes -

Singleton
prototype
request
session
global-session

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Very Frequently asked Spring question.
  Q8. What is bean auto wiring?Spring
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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 Q9. What are different modules of spring ?
Spring
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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 Q10. What is Spring configuration file?Spring
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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   Like         Discuss         Correct / Improve     j2ee   spring   mvc   frameworks   web applications   spring configuration file     Asked in 1 Companies

 Q11. Q: What is default scope of bean in Spring framework?Spring
Ans. The default scope of bean is Singleton.

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Frequently asked in Phone Interviews.
 Q12. What the Bean scopes provided by Spring ?Spring
Ans. Singleton , Prototype , Request , Session , global-session

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   Like         Discuss         Correct / Improve     spring framework   bean scope   general electric   ge

Frequently asked in Phone Interviews.
 Q13. What are the various Auto Wiring types in Spring ?
Ans. By Name , By Type and Constructor.

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   Like         Discuss         Correct / Improve     java   spring   spring container   dependency injection   auto wiring   auto wiring types   general electric   ge

 Q14. When should we use prototype scope and singleton scope for beans ?Spring
Ans. We should use singleton scope for beans when they are stateless and prototype when they are stateful.

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   Like         Discuss         Correct / Improve     spring   bean scope   general electric   ge  singleton

 Q15. Which web application framework you like and Why ?Framework
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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   Like         Discuss         Correct / Improve     spring   struts   project lead   technical lead   techical architect

 Q16. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?Spring
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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   Like         Discuss         Correct / Improve     java   singleton   spring framework   spring beans

 Q17. 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
Ans. ApplicationContextAware

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 Q18. What is Spring Boot ?Spring Boot
Ans. Spring Boot is Springs convention-over-configuration solution for creating stand-alone, production-grade Spring-based Applications.

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   Like         Discuss         Correct / Improve     Spring Boot     Asked in 7 Companies

 Q19. What is Spring Security ?Spring
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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   Like         Discuss         Correct / Improve          Asked in 3 Companies

 Q20. Explain your experience with Java, spring and web services?General
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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   Like         Discuss         Correct / Improve     spring  web services     Asked in 1 Companies

 Q21. Is there any relationship between Web.xml and Spring.xml ?Spring
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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 Q22. What are the advantages of Spring interceptor over Servlet Filters ?Spring
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.
 Q23. What are the components of Spring framework ?Spring
Ans. Core: [Core, Bean, Context, Expression Language]

Web: [Web, Portlet, Servlet, etc]

Data Access [JMS, JDBC, etc]

AOP, Aspect

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 Q24. Difference between MultipartResolver setMaxUploadSize and setMaxUploadSizePerFile ?Spring
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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   Like         Discuss         Correct / Improve     MultipartResolver

 Q25. What are the different ways in which dependency injection can be done using Spring Framework ?Spring
Ans. Using Constructor and Setters.

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   Like         Discuss         Correct / Improve     spring  dependency injection   inversion of control

 Q26. Difference between constructor and setter injection ?Spring
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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   Like         Discuss         Correct / Improve     spring  dependency injection   inversion of control     Asked in 3 Companies

 Q27. Difference between ApplicationContext and BeanFactory ?Spring
 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

 Q28. how do you share data between JSP and spring controller using Angular JS ?AngularJS
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     Asked in 1 Companies

 Q29. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?Spring
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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   Like         Discuss         Correct / Improve     singleton     Asked in 1 Companies

 Q30. Can we capture the Request body within the interceptor or Filter and perform operations on it ?Spring
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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   Like         Discuss         Correct / Improve     interceptor  filter

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