Class WebAppRootListener
- java.lang.Object
- org.springframework.web.util.WebAppRootListener
- All Implemented Interfaces:
EventListener
,ServletContextListener
public class WebAppRootListener extends Object implements ServletContextListener
Listener that sets a system property to the web application root directory. The key of the system property can be defined with the "webAppRootKey" init parameter at the servlet context level (i.e. context-param in web.xml), the default key is "webapp.root".Can be used for toolkits that support substitution with system properties (i.e. System.getProperty values), like log4j's "${key}" syntax within log file locations.
Note: This listener should be placed before ContextLoaderListener in
web.xml
, at least when used for log4j. Log4jConfigListener sets the system property implicitly, so there's no need for this listener in addition to it.WARNING: Some containers, e.g. Tomcat, do NOT keep system properties separate per web app. You have to use unique "webAppRootKey" context-params per web app then, to avoid clashes. Other containers like Resin do isolate each web app's system properties: Here you can use the default key (i.e. no "webAppRootKey" context-param at all) without worrying.
WARNING: The WAR file containing the web application needs to be expanded to allow for setting the web app root system property. This is by default not the case when a WAR file gets deployed to WebLogic, for example. Do not use this listener in such an environment!
- Since:
- 18.04.2003
- Author:
- Juergen Hoeller
- See Also:
WebUtils.setWebAppRootSystemProperty(javax.servlet.ServletContext)
,Log4jConfigListener
,System.getProperty(java.lang.String)
Constructor Summary
Constructors Constructor Description WebAppRootListener()
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
contextDestroyed(ServletContextEvent event)
void
contextInitialized(ServletContextEvent event)
Constructor Detail
WebAppRootListener
public WebAppRootListener()
Method Detail
contextInitialized
public void contextInitialized(ServletContextEvent event)
- Specified by:
contextInitialized
in interfaceServletContextListener
contextDestroyed
public void contextDestroyed(ServletContextEvent event)
- Specified by:
contextDestroyed
in interfaceServletContextListener