What is the purpose of ContextLoaderListener in Spring?

In the context of spring framework purpose of ContextLoaderListener is to load the other beans in your application such as the middle-tier and data-tier components that drive the back end of the application.

What is DispatcherServlet Spring?

The DispatcherServlet is the front controller in Spring web applications. It’s used to create web applications and REST services in Spring MVC. In a traditional Spring web application, this servlet is defined in the web. xml file to DispatcherServlet in a Spring Boot application.

What is root context in Spring MVC?

The root-context in a Spring application is the ApplicationContext that is loaded by the ContextLoaderListener . This context should have globally available resources like services, repositories, infrastructure beans ( DataSource , EntityManagerFactory s etc.) etc.

What is the difference between ApplicationContext xml and Spring servlet xml?

xml and spring-servlet. xml in Spring | Baeldung….4. applicationContext. xml vs. spring-servlet. xml.

Feature	applicationContext.xml	spring-servlet.xml
Scope	It defines the beans that are shared among all servlets.	It defines servlet-specific beans only.

Can we have multiple dispatcher servlets?

A web application can define any number of DispatcherServlet instances. Each servlet will operate in its own namespace, loading its own application context with mappings, handlers, etc. Only the root application context as loaded by ContextLoaderListener, if any, will be shared.

How many bean scopes are supported by Spring?

five scopes
Beans can be defined to be deployed in one of a number of scopes: out of the box, the Spring Framework supports exactly five scopes (of which three are available only if you are using a web-aware ApplicationContext ). Scopes a single bean definition to a single object instance per Spring IoC container.

What are true with DispatcherServlet?

DispatcherServlet acts as front controller for Spring based web applications. It provides a mechanism for request processing where actual work is performed by configurable, delegate components. It is inherited from javax. Only the root application context as loaded by ContextLoaderListener, if any, will be shared.

What is Springframework web context ContextLoaderListener?

As of Spring 3.1, ContextLoaderListener supports injecting the root web application context via the ContextLoaderListener(WebApplicationContext) constructor, allowing for programmatic configuration in Servlet 3.0+ environments. See WebApplicationInitializer for usage examples.

What is the difference between ApplicationContext and BeanFactory in spring framework?

The ApplicationContext comes with advanced features, including several that are geared towards enterprise applications, while the BeanFactory comes with only basic features. Therefore, it’s generally recommended to use the ApplicationContext, and we should use BeanFactory only when memory consumption is critical.

Why we use ApplicationContext XML in Spring?

Applicationcontext. xml – It is standard spring context file which contains all beans and the configuration that are common among all the servlets. It is optional file in case of web app. Spring uses ContextLoaderListener to load this file in case of web application.

What is the difference between Beanfactory and ApplicationContext?

a. One difference between bean factory and application context is that former only instantiate bean when you call getBean() method while ApplicationContext instantiates Singleton bean when the container is started, It doesn’t wait for getBean to be called.

What is contextloaderlistener in DispatcherServlet?

When DispatcherServlet starts up, it creates a Spring application context and starts loading it with beans declared in the configuration files or classes that it’s given. But in Spring web applications, there’s often another application context. This other application context is created by ContextLoaderListener

How does DispatcherServlet work in spring?

When DispatcherServlet starts up, it creates a Spring application context and starts loading it with beans declared in the configuration files or classes that it’s given. But in Spring web applications, there’s often another application context.

What is contextcontextloaderlistener in Spring Boot?

ContextLoaderListener reads the Spring configuration file (with value given against contextConfigLocation in web.xml ), parses it and loads the singleton bean defined in that config file.

What is the difference between webapplicationcontext and DispatcherServlet?

The root WebApplicationContext is a Spring Application Context shared across the application. A DispatcherServlet instance actually has its own WebApplicationContext. One can have multiple DispatcherServlet instances in an application, and each will have its own WebApplicationContext.