Package org.springframework.web.context

Class AbstractContextLoaderInitializer

java.lang.Object

org.springframework.web.context.AbstractContextLoaderInitializer

All Implemented Interfaces:

WebApplicationInitializer

Direct Known Subclasses:

AbstractDispatcherServletInitializer

public abstract class AbstractContextLoaderInitializer
extends Object
implements WebApplicationInitializer

Convenient base class for WebApplicationInitializer implementations that register a ContextLoaderListener in the servlet context.

The only method required to be implemented by subclasses is createRootApplicationContext(), which gets invoked from registerContextLoaderListener(ServletContext).

Since:

3.2

Author:

Arjen Poutsma, Chris Beams, Juergen Hoeller

Field Summary

Fields

Modifier and Type	Field	Description
protected final Log	logger	Logger available to subclasses.

Constructor Summary

Constructors

Constructor	Description
AbstractContextLoaderInitializer()

Method Summary

Modifier and Type	Method	Description
protected abstract WebApplicationContext	createRootApplicationContext()	Create the "root" application context to be provided to the ContextLoaderListener.
protected ApplicationContextInitializer<?>[]	getRootApplicationContextInitializers()	Specify application context initializers to be applied to the root application context that the ContextLoaderListener is being created with.
void	onStartup(ServletContext servletContext)	Configure the given ServletContext with any servlets, filters, listeners context-params and attributes necessary for initializing this web application.
protected void	registerContextLoaderListener(ServletContext servletContext)	Register a ContextLoaderListener against the given servlet context.

Methods inherited from class java.lang.Object

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

Field Details

logger

protected final Log logger

Logger available to subclasses.

Constructor Details

AbstractContextLoaderInitializer

public AbstractContextLoaderInitializer()

Method Details

onStartup

public void onStartup(ServletContext servletContext)
               throws ServletException

Description copied from interface: WebApplicationInitializer

Configure the given ServletContext with any servlets, filters, listeners context-params and attributes necessary for initializing this web application. See examples above.

Specified by:

onStartup in interface WebApplicationInitializer

Parameters:

servletContext - the ServletContext to initialize

Throws:

ServletException - if any call against the given ServletContext throws a ServletException

registerContextLoaderListener

protected void registerContextLoaderListener(ServletContext servletContext)

Register a ContextLoaderListener against the given servlet context. The ContextLoaderListener is initialized with the application context returned from the createRootApplicationContext() template method.

Parameters:

servletContext - the servlet context to register the listener against

createRootApplicationContext

@Nullable
protected abstract WebApplicationContext createRootApplicationContext()

Create the "root" application context to be provided to the ContextLoaderListener.

The returned context is delegated to ContextLoaderListener(WebApplicationContext) and will be established as the parent context for any DispatcherServlet application contexts. As such, it typically contains middle-tier services, data sources, etc.

Returns:

the root application context, or null if a root context is not desired

See Also:

• AbstractDispatcherServletInitializer

getRootApplicationContextInitializers

@Nullable
protected ApplicationContextInitializer<?>[] getRootApplicationContextInitializers()

Specify application context initializers to be applied to the root application context that the ContextLoaderListener is being created with.

Since:

4.2

See Also:

• createRootApplicationContext()
• ContextLoader.setContextInitializers(org.springframework.context.ApplicationContextInitializer<?>...)