org.springframework.web.context

Class ContextLoaderListener

java.lang.Object

org.springframework.web.context.ContextLoader

org.springframework.web.context.ContextLoaderListener

All Implemented Interfaces:

EventListener, ServletContextListener

public class ContextLoaderListener
extends ContextLoader
implements ServletContextListener

Bootstrap listener to start up and shut down Spring's root WebApplicationContext. Simply delegates to ContextLoader as well as to ContextCleanupListener.

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.

Since:

17.02.2003

Author:

Juergen Hoeller, Chris Beams

See Also:

ContextLoader.setContextInitializers(org.springframework.context.ApplicationContextInitializer<?>...), WebApplicationInitializer

Field Summary

Fields inherited from class org.springframework.web.context.ContextLoader

CONFIG_LOCATION_PARAM, CONTEXT_CLASS_PARAM, CONTEXT_ID_PARAM, CONTEXT_INITIALIZER_CLASSES_PARAM, GLOBAL_INITIALIZER_CLASSES_PARAM

Constructor Summary

Constructors

Constructor and Description
ContextLoaderListener() Create a new ContextLoaderListener that will create a web application context based on the "contextClass" and "contextConfigLocation" servlet context-params.
ContextLoaderListener(WebApplicationContext context) Create a new ContextLoaderListener with the given application context.

Method Summary

Modifier and Type	Method and Description
void	contextDestroyed(ServletContextEvent event) Close the root web application context.
void	contextInitialized(ServletContextEvent event) Initialize the root web application context.

Methods inherited from class org.springframework.web.context.ContextLoader

closeWebApplicationContext, configureAndRefreshWebApplicationContext, createWebApplicationContext, customizeContext, determineContextClass, determineContextInitializerClasses, getCurrentWebApplicationContext, initWebApplicationContext, loadParentContext, setContextInitializers

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ContextLoaderListener

public ContextLoaderListener()

Create a new ContextLoaderListener that will create a web application context based on the "contextClass" and "contextConfigLocation" servlet context-params. See ContextLoader superclass documentation for details on default values for each.

This constructor is typically used when declaring ContextLoaderListener as a <listener> within web.xml, where a no-arg constructor is required.

The created application context will be registered into the ServletContext under the attribute name WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE and the Spring application context will be closed when the contextDestroyed(javax.servlet.ServletContextEvent) lifecycle method is invoked on this listener.

See Also:

ContextLoader, ContextLoaderListener(WebApplicationContext), contextInitialized(ServletContextEvent), contextDestroyed(ServletContextEvent)

ContextLoaderListener

public ContextLoaderListener(WebApplicationContext context)

Create a new ContextLoaderListener with the given application context. This constructor is useful in Servlet 3.0+ environments where instance-based registration of listeners is possible through the ServletContext.addListener(java.lang.String) API.

The context may or may not yet be refreshed. If it (a) is an implementation of ConfigurableWebApplicationContext and (b) has not already been refreshed (the recommended approach), then the following will occur:

• If the given context has not already been assigned an id, one will be assigned to it
• ServletContext and ServletConfig objects will be delegated to the application context
• ContextLoader.customizeContext(javax.servlet.ServletContext, org.springframework.web.context.ConfigurableWebApplicationContext) will be called
• Any ApplicationContextInitializer org.springframework.context.ApplicationContextInitializer ApplicationContextInitializers specified through the "contextInitializerClasses" init-param will be applied.
• refresh() will be called

If the context has already been refreshed or does not implement ConfigurableWebApplicationContext, none of the above will occur under the assumption that the user has performed these actions (or not) per his or her specific needs.

See WebApplicationInitializer for usage examples.

In any case, the given application context will be registered into the ServletContext under the attribute name WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE and the Spring application context will be closed when the contextDestroyed(javax.servlet.ServletContextEvent) lifecycle method is invoked on this listener.

Parameters:

context - the application context to manage

See Also:

contextInitialized(ServletContextEvent), contextDestroyed(ServletContextEvent)

Method Detail

contextInitialized

public void contextInitialized(ServletContextEvent event)

Initialize the root web application context.

Specified by:

contextInitialized in interface ServletContextListener

Parameters:

event - the ServletContextEvent containing the ServletContext that is being initialized

contextDestroyed

public void contextDestroyed(ServletContextEvent event)

Close the root web application context.

Specified by:

contextDestroyed in interface ServletContextListener

Parameters:

event - the ServletContextEvent containing the ServletContext that is being destroyed