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Interview Questions and Answers for 'Spring' - 77 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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   Like         Discuss         Correct / Improve     java   string comparison   string   object class   ==    equals   object equality  operator     Asked in 289 Companies      basic        frequent

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Recently asked in TCS , Tech Mahindra, HCL , Accenture and Fidelity.
  Q2. Explain Flow of Spring MVC ?Spring
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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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 Q3. What are the benefits of using Spring Framework ?Spring
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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


Very frequently asked.Usually among first few questions.
  Q4. 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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 Q5. How can we manage Error Messages in the web application ?Solution
Anonymous
Ans. Within message.properties file.

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 Q6. Difference between Java beans and Spring Beans ?Spring
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Ans. Java Beans managed by Spring IoC are called Spring Beans.

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

Singleton
prototype
request
session
global-session

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 Q8. What are some differences between Spring caching and Hibernate caching?Hibernate
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Ans. Spring caching makes use of its intercepting capabilities to add caching to method calls. Therefore, the entire object is cached and reused. Hibernate, on the other hand, has more domain-specific knowledge of the Entity being cached and can handle the objects more appropriately.

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 Q9. Can we have two beans with same class with different bean id in spring ?Spring2016-10-18 14:18:43

Ans. Yes

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 Q10. 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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 Q11. What are different modules of spring ?
Spring
Admin
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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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 Q12. 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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 Q13. Q: What is default scope of bean in Spring framework?Spring
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Ans. The default scope of bean is Singleton.

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Very Frequently asked Spring question.
  Q14. What is bean auto wiring?Spring
Admin
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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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   Like         Discuss         Correct / Improve     j2ee   spring   mvc   frameworks   web applications   autowiring   beans   at&t   ge     Asked in 9 Companies        frequent


Frequently asked in Phone Interviews.
 Q15. What the Bean scopes provided by Spring ?Spring
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Ans. Singleton , Prototype , Request , Session , global-session

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Frequently asked in Phone Interviews.
 Q16. What are the various Auto Wiring types in Spring ?
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Ans. By Name , By Type and Constructor.

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 Q17. When should we use prototype scope and singleton scope for beans ?Spring
admin
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Ans. We should use singleton scope for beans when they are stateless and prototype when they are stateful.

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 Q18. Which web application framework you like and Why ?Framework
Admin
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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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 Q19. What is the difference betweeen @Inject and @Autowired ?Spring
Admin
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Ans. @Autowired and @Inject are similar in terms of functionality they achieve. @Inject is part of a new Java technology called CDI that defines a standard for dependency injection whereas @Autowired is a Spring specific annotation for dependency injection.

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 Q20. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?Spring
Admin
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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


 Q21. Which class provides the enumerated value for Bean Scope ?

a. BeanDefinition
b. ConfigurableBeanFactory
c. WebApplicationContext
d. All of the Above
Spring
Anonymous
Ans. All of the Above

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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. In Spring , Which class handles the Http requests for RESTful web services ?

a. Service
b. Model
c. Controller
d. Util
Spring
Anonymous
Ans. Controller

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 Q24. 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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   Like         Discuss         Correct / Improve     Spring Boot     Asked in 7 Companies


 Q25. 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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 Q26. 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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 Q27. 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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 Q28. 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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 Q29. Tell us something about Spring framework ?Spring2017-02-02 18:05:41

Ans. Spring is a lightweight framework which gives in-build DI(Dependency injection) and IOC(Inversion of control) features. Where DI is used for injecting one bean into the another bean like Inheritance in Java and IOC is a controller which will control the flow of the bean like bean creation and so on. We will use Bean Factory and Application Context for configuring.

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Frequently asked Spring interview question.
 Q30. 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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 Q31. What are the core interfaces of Spring mvc ?Spring2017-03-09 13:13:56

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


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 Q32. 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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 Q33. How to set maximum file upload size in Spring MVC ? Spring2017-03-09 14:35:54

Ans. We can use class MultipartResolver method setMaxUploadSize.

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 Q34. Explain Spring invoke and wait.Spring2017-04-09 08:56:55

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


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 Q35. Whats is the difference between Spring MVC and Spring Restful webservice ?Spring2017-05-03 15:33:20

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


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 Q36. What is the use of @Bean annotation in Spring ?Spring2017-05-16 19:35:49

Ans. There are 2 ways to specify dependencies in Spring, one by the way of specifying beans in config files and other is by specifying annotations like @Bean, @Component , @Service etc to let spring know of the dependencies.

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 Q37. 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


 Q38. 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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 Q39. Difference between ApplicationContext and BeanFactory ?Spring2017-06-23 11:50:50

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 Q40. Explain inner beans in Spring.Spring2017-06-23 11:51:53

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