Spring Interview Questions and Answers

Posted by: | Published: Sunday, March 27, 2016 | Categories:
This is a summary of some of the most important questions concerning the Spring Framework, that you may be asked to answer in an interview or in an interview test Spring overview. Some few Spring interview question are taken from Bari sir who is our respectable advisor in Web School BD.

1. What is Spring?
 Spring is an open source development framework for Enterprise Java. The core features of the Spring Framework can be used in developing any Java application, but there are extensions for building web applications on top of the Java EE platform. Spring framework targets to make Java EE development easier to use and promote good programming practice by enabling a POJO-based programming model.

2. What are benefits of Spring Framework?
Lightweight: Spring is lightweight when it comes to size and transparency. The basic version of spring framework is around 2MB. Inversion of control (IOC): Loose coupling is achieved in Spring, with the Inversion of Control technique. The objects give their dependencies instead of creating or looking for dependent objects. Aspect oriented (AOP): Spring supports Aspect oriented programming and separates application business logic from system services. Container: Spring contains and manages the life cycle and configuration of application objects. MVC Framework: Spring’s web framework is a well-designed web MVC framework, which provides a great alternative to web frameworks. Transaction Management: Spring provides a consistent transaction management interface that can scale down to a local transaction and scale up to global transactions (JTA). Exception Handling: Spring provides a convenient API to translate technology-specific exceptions (thrown by JDBC, Hibernate, or JDO) into consistent, unchecked exceptions.

 3. Which are the Spring framework modules?
The basic modules of the Spring framework are : Core module Bean module Context module Expression Language module JDBC module ORM module OXM module Java Messaging Service(JMS) module Transaction module Web module Web-Servlet module Web-Struts module Web-Portlet module

 4. Explain the Core Container (Application context) module
This is the basic Spring module, which provides the fundamental functionality of the Spring framework. BeanFactory is the heart of any spring-based application. Spring framework was built on the top of this module, which makes the Spring container.

5. BeanFactory – BeanFactory implementation example A BeanFactory is an implementation of the factory pattern that applies Inversion of Control to separate the application’s configuration and dependencies from the actual application code. The most commonly used BeanFactory implementation is the XmlBeanFactory class.

6. XMLBeanFactory The most useful one is org.springframework.beans.factory.xml.XmlBeanFactory, which loads its beans based on the definitions contained in an XML file. This container reads the configuration metadata from an XML file and uses it to create a fully configured system or application.

7. Explain the AOP module
The AOP module is used for developing aspects for our Spring-enabled application. Much of the support has been provided by the AOP Alliance in order to ensure the interoperability between Spring and other AOP frameworks. This module also introduces metadata programming to Spring.

8. Explain the JDBC abstraction and DAO module.
With the JDBC abstraction and DAO module we can be sure that we keep up the database code clean and simple, and prevent problems that result from a failure to close database resources. It provides a layer of meaningful exceptions on top of the error messages given by several database servers. It also makes use of Spring’s AOP module to provide transaction management services for objects in a Spring application.

9. Explain the object/relational mapping integration module.
 Spring also supports for using of an object/relational mapping (ORM) tool over straight JDBC by providing the ORM module. Spring provides support to tie into several popular ORM frameworks, including Hibernate, JDO, and iBATIS SQL Maps. Spring’s transaction management supports each of these ORM frameworks as well as JDBC. 10. Explain the web module The Spring web module is built on the application context module, providing a context that is appropriate for web-based applications. This module also contains support for several web-oriented tasks such as transparently handling multipart requests for file uploads and programmatic binding of request parameters to your business objects. It also contains integration support with Jakarta Struts.

11. Explain the Spring MVC module.
 MVC framework is provided by Spring for building web applications. Spring can easily be integrated with other MVC frameworks, but Spring’s MVC framework is a better choice, since it uses IoC to provide for a clean separation of controller logic from business objects. With Spring MVC you can declaratively bind request parameters to your business objects.

12. Explain Spring configuration file.
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.

13. What is Spring IoC container?
The Spring IoC is responsible for creating the objects,managing them (with dependency injection (DI)), wiring them together, configuring them, as also managing their complete lifecycle.

14. What are the benefits of IOC?
 IOC or dependency injection minimizes the amount of code in an application. It makes easy to test applications, since no singletons or JNDI lookup mechanisms are required in unit tests. Loose coupling is promoted with minimal effort and least intrusive mechanism. IOC containers support eager instantiation and lazy loading of services.

 15. What are the common implementations of the ApplicationContext?
The FileSystemXmlApplicationContext container loads the definitions of the beans from an XML file. The full path of the XML bean configuration file must be provided to the constructor. The ClassPathXmlApplicationContext container also loads the definitions of the beans from an XML file. Here, you need to set CLASSPATH properly because this container will look bean configuration XML file in CLASSPATH. The WebXmlApplicationContext: container loads the XML file with definitions of all beans from within a web application.

16. What is the difference between Bean Factory and ApplicationContext?
Application contexts provide a means for resolving text messages, a generic way to load file resources (such as images), they can publish events to beans that are registered as listeners. In addition, operations on the container or beans in the container, which have to be handled in a programmatic fashion with a bean factory, can be handled declaratively in an application context. The application context implements MessageSource, an interface used to obtain localized messages, with the actual implementation being pluggable.

17. What does a Spring application look like?
 An interface that defines the functions. The implementation that contains properties, its setter and getter methods, functions etc., Spring AOP The Spring configuration XML file. Client program that uses the function

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