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Listing 6-1. Declaring a Context Loader Listener
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<listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> By default, this will read an XML bean configuration file from WEB-INF/applicationContext.xml and maintain the beans declared here until the web application is shut down. This default location can be overridden by using a context-param entry in web.xml, as shown in Listing 6-2.
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Listing 6-2. Overriding the Default Context Configuration File
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<context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> Here I instruct the listener to load the configuration file from the root of the classpath instead of the WEB-INF directory. ContextLoaderListener uses a property editor to parse the parameter values, so the normal syntax for specifying resource types (for example, the classpath: prefix) can be used as if this were a standard bean definition. You can specify multiple configuration files by providing a comma-separated list of resources for the parameters values.
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Context Loader Servlet
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Listeners were added in version 2.3 of the Servlet API. If you are working with an older application server, you must use ContextLoaderServlet instead. There is an ambiguity in version 2.3 about the order in which servlets and filters should be initialized; if your web server does not initialize listeners before servlets, you will need to use the context loader servlet instead of the context loader listener configuration. Listing 6-3 shows the configuration of the context loader servlet in the deployment descriptor.
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Listing 6-3. Configuring the Context Loader Servlet
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<servlet> <servlet-name>context</servlet-name> <servlet-class> org.springframework.web.context.ContextLoaderServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> The context loader servlet performs exactly the same job as the context loader listener, but you will need to provide a little more information. By default, servlets can start up in any order and if not explicitly requested, the application server is able to use lazy loading to initialize them on demand. Because the context loader servlet needs to be initialized in order to initialize the Spring beans defined by it, you must provide an explicit load-onstartup parameter for the context loader servlet. If a nonzero value is specified here, the application will guarantee that the servlet is started up when the application server is started up. Furthermore, any other servlets using Spring beans have a dependency on this servlet and must therefore be started later. The load-on-startup parameter also dictates the initialization order: the lower the value specified, the earlier in the initialization sequence
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the servlet will be loaded. You will therefore need to give the context loader servlet a loadon-startup value of 1, as shown in Listing 6-3. Any other servlets using Spring technologies must be given a higher load-on-startup value. The context loader servlet uses the same default configuration file as the listener, and can use the same context-param entry to override this default.
Other Contexts
Other daughter contexts may well be managed by other components. For example, when using a Spring MVC dispatcher servlet, it will create its own private application context. The application context managed by the context loader listener or servlet is the only context that is visible to all other contexts. Other contexts are not necessarily visible to each other, and beans created in these contexts are not necessarily visible to beans created in the main application context.
Spring MVC
The Spring MVC framework is a powerful environment within which to create clean, decoupled web applications. There is excellent support for simple tasks such as handling form submission and rendering content in multiple output formats. The key components of the framework are controller classes to make decisions and invoke business logic, command beans to represent form and request parameters, and view resolvers to render the contents of the command beans and reference data supplied by the controllers.
Dispatchers
Because Spring MVC runs as a standard Java EE web application, the entry point to the framework is a Java EE servlet. This servlet dispatches incoming web requests to a URL mapping bean, which in turn determines which Spring controller will handle the request. Listing 6-4 shows the configuration of a suitable dispatcher servlet.
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