When it comes to spring mvc, dispatcherservlet is that front controller. Spring mvc is mostly used with spring for any web application development. Spring mvc questions and answers interview questions explain spring mvc request response life cycle. Mention the technologies you have used to develop that project. A spring mvc is a java framework which is used to develop dynamic web applications. It implements all the basic features of a core spring framework like inversion of control and dependency injection. Explain just about your technical work not about the working. Spring helps us to create classes in a way that tight coupling can be removed and loose coupling can be done.
How dispatcherservlet works internally in spring mvc or what is the role of dispatcherservlet in spring mvc is some of the frequently asked spring mvc interview questions. When a class classa is dependent on another classs object classb, then we say classa is tightly coupled with classb. Dispatcherservlet is the class which manages the entire request handling process. The dispatcherservlet is an implementation of front controller design pattern which handles all incoming web request to a spring mvc application a front controller pattern is a common pattern in web applications whose job is to receive all request and route it to different components of the application for actual processing. Here, model a model contains the data of the application. Spring mvc provides a dignified solution to use mvc in spring framework by the help of dispatcherservlet. In this case, dispatcherservlet is a class that receives the incoming request and maps it to the right resource such as controllers, models, and views.
Top 30 spring core, spring mvc and spring security. Spring boot tutorials our spring boot tutorials covers the core and advances feature of spring boot including starters, actuator, cli and spring boot build process. The spring web modelviewcontroller mvc framework is designed around a dispatcherservlet that dispatches requests to handlers, with configurable handler mappings, view resolution, locale, and theme resolution as well as support for uploading files. Spring mvc interview questions spring rest interview.
See the dispatcherservletwebapplicationcontext javadoc for details. To run the spring mvc, we need to define dispatcherservlet, contextconfiglocation and contextloaderlistener in web. Controllers control the flow of the application execution. Be prepared for spring mvc questions with technically sound answers. It is integrated with rest of the beans and spring container through the configuration xml named as servlet.
In spring s web mvc framework the mechanism of dispatching the request to the appropriate controllers is achieved by configuring the dispatcherservlet class. Dispatcherservlet is responsible for initializing the webapplicationcontext and it loads all configuration related to the web components like controllers, view resolver, interceptors etc. How to explain your project in an interview which has. In this tutorial, well focus on the questions related to it, as it is often a topic on a spring developer job interview. You might have seen them already during your previous java web development interviews but if. A list of top frequently asked spring mvc interview questions.
Additional links have been given to refer spring mvc sample example. It provides modelview controller architecture that can be used to develop flexible web applications. Spring mvc interview questions with answers howtodoinjava. Spring s mvc framework provides a clean separation between domain model code and web forms and integrates with all of the other features of the spring framework. When we use spring mvc, we need to configure component scan, dispatcher servlet, a view resolver, web jarsfor delivering static content among other things.
Interview question on modelandview and dispatcherservlet. Spring s dispatcherservlet however, does more than just that. Dont forget to brush up these 8 spring mvc interview question. The dispatcherservlet is a front controller like it provides a single entry point for a client request to spring mvc web application and forwards request to spring. The dispatcherservlet is an implementation of front controller design pattern which handles all incoming web request to a spring mvc. Spring mvc makes use of a preconfigured servlet called dispatcherservlet.
To demonstrate this situation, we will reuse one of the earlier articles on spring mvc. Dispatcherservlet actually a servlet is the front controller in spring mvc that intercepts every request and then dispatchesforwards requests to an appropriate controller. The spring mvc dispatcher servlet scans for all the conroller classes. Viewname along with model in modelandview is rendered and finally result shown to endusers.
When a request is sent to the spring mvc framework the following sequence of events happen. While reading these spring mvc interview questions for experienced and freshers you will surely like them and will not like to miss them et al. Spring is a powerful framework that is used all over the world by java developers to develop java enterprise web application. Spring mvc tutorial our spring mvc tutorial is designed for java programmers with a need to understand the spring mvc along with its architecture and actual usage. It dispatches the requests to the controllers and offers other functionalities used to develop webapplications. It is very powerful and nice layered architecture for flow and configuration. Spring mvc architecture uses the frontcontroller design pattern which is fundamental to any mvc design implementation. Top 20 spring mvc interview questions for java programmers. Browse other questions tagged java spring spring mvc or ask your own question. What is dispatcherservlet and contextloaderlistener. The dispatcherservlet is an implementation of the front controller design pattern that handles all incoming web request to a spring mvc. Spring controller annotation can be applied on classes only.
This is the servlet in a spring mvc application defined in web. Dispatcherservlet resolves theme and locale as configured. The spring web modelview controller mvc framework is designed around a dispatcherservlet that dispatches requests to handlers, with configurable handler mappings, view resolution, locale and theme resolution as well as support for uploading files. Btw, its not the only way to declare dispatcherservlet in spring mvc. Spring mvc questions and answers interview questions. In this article, learn the spring mvc flow with example. In spring mvc this is not the case, we do not have to configure any servlet. To demonstrate this situation, we will reuse one of the earlier articles on spring mvc xml based application. Data can be a single object or a collection of objects. If you remember, to enable spring mvc, we need to declare the dispatcherservlet from spring mvc jar into web.
Before appearing for an interview if you will know the answers to these questions, then it will be good. The task of the dispatcherservlet is sent a request to the specific spring mvc controller. The way you can explain your project to the interviewer is 1. Blog this veteran started a code bootcamp for people who went to bootcamp. This servlet listens for a url pattern as shown in below web. Prepare for the following questions to face spring mvc interview. The front controller is a dispatcherservlet class present in. This is a servlet 3,0 feature which allows servlet 3. The dispatcherservlet consults the handlermapping based on url mapping and invokes the controller. Be sure about what you answer since they may be the source of followup questions. What happens, if we return null object instead of returning of valid wellconstructed modelandview object in above described spring mvc request flow. It is very flexible to integrate with other web frameworks. The springwebmvc module also known as the webservlet module contains spring s modelviewcontroller mvc and rest web services implementation for web applications.
Following spring interview questions are for freshers and. The mvc framework works around central servlet called dispatcherservlet. All requests arrive at the dispatcherservlet front controller step 0 in figure. When a web request is sent to a spring mvc application, dispatcher servlet first receives the request. This post is the part of our interview questions series and in this post, we will discuss some commonly asked spring mvc interview questions during a job interview q1. In spring mvc architecture the dispatcherservlet works as front controller. The patternsavvy reader will recognize that the dispatcher servlet is an expression of the front controller design pattern this is a pattern that spring web mvc. We only make use of this dispatcherservlet to route the incoming request to the correct controller and view and return it to the user. Like a normal servlet dispatcherservlet also needs to be configured in the web deployement. The request processing work flow of the spring web mvc dispatcher servlet is illustrated in the following diagram. Top 40 spring interview questions and answersupdated for. Spring mvc interview questions and answers dinesh on java.
Finds appropriate controller handler to handle the request. We have explained the concept of dispatcher servlet in a very refined manner. Dispatcherservlet sends viewname from modelandview object to view resolver. If youre appearing for an interview for a java developer role, spring.
Top 48 spring interview questions crack interview easily. What is the use of dispatcherservlet in spring mvc. Spring controller spring mvc controller journaldev. The dispatcherservlet in javasprings tutorial 12 april.
Most popular spring interview questions and answers. It is required to specify the dispatcherservlet class in the web. I would like to know if it is a common practice to customize dispatcherservlet while working with spring mvc, like people sometimes customize actionservlet or requestprocessor. Top 40 mvc interview questions and answers edureka. Spring mvc interview questions now that we have seen some questions on spring core and basics, its time for spring mvc interview questions which is probably the most important thing because of the popularity of spring as mvc framework and standard for developing java web application. But i had certain experience in working with struts 1. Spring spring mvc interview questions playlist groups the questions by the topic. First of all tell about what you have made in a line. Simplified actions taken by dispatcherservlet are listed below. Spring based applications have a lot of configuration. With this crisp and pointtopoint answers, you will be able to answer most of the interview questions confidently.
Spring mvc is the original web framework from spring built on the servlet api. Spring provides a dispatcher servlet called dispatcherservlet, which maps to an uri path pattern. Details on spring core modules and spring framework interview questions. What is the dispatcherservlet in spring and its uses. In spring mvc, dispatcherservlet is used for finding the correct controller to process a request, which it does with the help of handler mapping, e. Most popular spring mvc interview questions with answers for entry level and experienced candidates.