org.springframework.web.util
Class WebAppRootListener
java.lang.Object
org.springframework.web.util.WebAppRootListener
public class WebAppRootListener
- extends java.lang.Object
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 substition 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(ServletContext)
,
Log4jConfigListener
,
System.getProperty(java.lang.String)
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
WebAppRootListener
public WebAppRootListener()
contextInitialized
public void contextInitialized(ServletContextEvent event)
contextDestroyed
public void contextDestroyed(ServletContextEvent event)