![]() The configuration metadata is represented in XML, Java annotations, or Java code. The container gets its instructions on what objects to instantiate, configure, and assemble by reading configuration metadata. The interface represents the Spring IoC container and is responsible for instantiating, configuring, and assembling the aforementioned beans. The is considered as the root context or parent context for all the other contexts.Spring manages beans that belong to different contexts.Spring has provision for defining multiple contexts in parent/child hierarchy.Using Spring MVC requires a proper understanding of ‘Contexts’ of the framework. If we have only one file with spring beans configuration meta data, then we can configure only that xml file in DispatcherServlet's web context, which is the only mandatory context for a web MVC application, in which case we can exclude the configuration for the servlet context listener ContextLoaderListener in the framework is one of the widely used frameworks in Enterprise Java World. Due to this all the beans configured in that corresponding xml file will be instantiated twice including any of those beans defined for connection pooling, in which case connection pooling will also be a problem. Most of the examples on the web have Spring MVC configuration with in a single file included in both the parent context and the child context because of lack of understanding of how Spring works. And the classes those annotated with and the beans those are related to the MVC layer are configured in the DispatcherServlet configuration file. ![]() Usually the model classes and other common beans like common services which belong to the entire application are configured as beans in the applicationContext.xml file. So, in both the above cases IE the ContextLoaderListener or in case of DispatcherServlet if the parameters are not found in the web.xml and the corresponding files applicationContext.xml or 'OurServletName'-servlet.xml are not found in the classpath then a FileNotFoundException will be thrown and the application would not start up. Note: The child context IE the MVC context in our case will have access to the beans in the root or parent context. The file name being searched for is made up of the servlet name – in our case 'dispatcher' – and a string '-servlet.xml' as suffix. If the init-param is not configured in the 'web.xml', then a file named dispatcher-servlet.xml will be searched for in the classpath. (This listener will get automatically invoked when a web app is deployed on the server.) In web.xml file we have the configuration for the '.ContextLoaderListener' class, which is a servlet context listener in the following way. The ApplicationContext related beans can be loaded using one of the two following ways: DispatcherServlet will have this web context. The FrameworkServlet of the spring framework i.e. There is one more context called WebApplicationContext in Spring MVC framework, which is a child context. Spring provides functionality for defining multiple contexts in parent and child hierarchy. Spring manages beans those can belong to different contexts. The '' class is considered as the parent context or root context for all the other contexts. Using Spring MVC framework requires a proper understanding of 'Contexts' of the framework. ![]() In Enterprise Java Applications Spring framework is one of the widely used frameworks. In this blog, I am going to explain you about multiple contexts of the Spring MVC Framework.
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