Class Log4jWebConfigurer
- java.lang.Object
- org.springframework.web.util.Log4jWebConfigurer
@Deprecated public abstract class Log4jWebConfigurer extends Object
Deprecated.as of Spring 4.2.1, in favor of Apache Log4j 2 (following Apache's EOL declaration for log4j 1.x)Convenience class that performs custom log4j initialization for web environments, allowing for log file paths within the web application, with the option to perform automatic refresh checks (for runtime changes in logging configuration).WARNING: Assumes an expanded WAR file, both for loading the configuration file and for writing the log files. If you want to keep your WAR unexpanded or don't need application-specific log files within the WAR directory, don't use log4j setup within the application (thus, don't use Log4jConfigListener or Log4jConfigServlet). Instead, use a global, VM-wide log4j setup (for example, in JBoss) or JDK 1.4's
java.util.logging
(which is global too).Supports three init parameters at the servlet context level (that is, context-param entries in web.xml):
- "log4jConfigLocation":
Location of the log4j config file; either a "classpath:" location (e.g. "classpath:myLog4j.properties"), an absolute file URL (e.g. "file:C:/log4j.properties), or a plain path relative to the web application root directory (e.g. "/WEB-INF/log4j.properties"). If not specified, default log4j initialization will apply ("log4j.properties" or "log4j.xml" in the class path; see the log4j documentation for details). - "log4jRefreshInterval":
Interval between config file refresh checks, in milliseconds. If not specified, no refresh checks will happen, which avoids starting log4j's watchdog thread. - "log4jExposeWebAppRoot":
Whether the web app root system property should be exposed, allowing for log file paths relative to the web application root directory. Default is "true"; specify "false" to suppress expose of the web app root system property. See below for details on how to use this system property in log file locations.
Note:
initLogging
should be called before any other Spring activity (when using log4j), for proper initialization before any Spring logging attempts.Log4j's watchdog thread will asynchronously check whether the timestamp of the config file has changed, using the given interval between checks. A refresh interval of 1000 milliseconds (one second), which allows to do on-demand log level changes with immediate effect, is not unfeasible.
WARNING: Log4j's watchdog thread does not terminate until VM shutdown; in particular, it does not terminate on LogManager shutdown. Therefore, it is recommended to not use config file refreshing in a production J2EE environment; the watchdog thread would not stop on application shutdown there.
By default, this configurer automatically sets the web app root system property, for "${key}" substitutions within log file locations in the log4j config file, allowing for log file paths relative to the web application root directory. The default system property key is "webapp.root", to be used in a log4j config file like as follows:
log4j.appender.myfile.File=${webapp.root}/WEB-INF/demo.log
Alternatively, specify a unique context-param "webAppRootKey" per web application. For example, with "webAppRootKey = "demo.root":
log4j.appender.myfile.File=${demo.root}/WEB-INF/demo.log
WARNING: Some containers (like 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.
- Since:
- 12.08.2003
- Author:
- Juergen Hoeller, Marten Deinum
- See Also:
Log4jConfigurer
,Log4jConfigListener
- "log4jConfigLocation":
Field Summary
Fields Modifier and Type Field Description static String
CONFIG_LOCATION_PARAM
Deprecated.Parameter specifying the location of the log4j config filestatic String
EXPOSE_WEB_APP_ROOT_PARAM
Deprecated.Parameter specifying whether to expose the web app root system propertystatic String
REFRESH_INTERVAL_PARAM
Deprecated.Parameter specifying the refresh interval for checking the log4j config file
Constructor Summary
Constructors Constructor Description Log4jWebConfigurer()
Deprecated.
Method Summary
All Methods Static Methods Concrete Methods Deprecated Methods Modifier and Type Method Description static void
initLogging(ServletContext servletContext)
Deprecated.Initialize log4j, including setting the web app root system property.static void
shutdownLogging(ServletContext servletContext)
Deprecated.Shut down log4j, properly releasing all file locks and resetting the web app root system property.
Field Detail
CONFIG_LOCATION_PARAM
public static final String CONFIG_LOCATION_PARAM
Deprecated.Parameter specifying the location of the log4j config file- See Also:
- Constant Field Values
REFRESH_INTERVAL_PARAM
public static final String REFRESH_INTERVAL_PARAM
Deprecated.Parameter specifying the refresh interval for checking the log4j config file- See Also:
- Constant Field Values
EXPOSE_WEB_APP_ROOT_PARAM
public static final String EXPOSE_WEB_APP_ROOT_PARAM
Deprecated.Parameter specifying whether to expose the web app root system property- See Also:
- Constant Field Values
Constructor Detail
Log4jWebConfigurer
public Log4jWebConfigurer()
Deprecated.
Method Detail
initLogging
public static void initLogging(ServletContext servletContext)
Deprecated.Initialize log4j, including setting the web app root system property.- Parameters:
servletContext
- the current ServletContext- See Also:
WebUtils.setWebAppRootSystemProperty(javax.servlet.ServletContext)
shutdownLogging
public static void shutdownLogging(ServletContext servletContext)
Deprecated.Shut down log4j, properly releasing all file locks and resetting the web app root system property.- Parameters:
servletContext
- the current ServletContext- See Also:
WebUtils.removeWebAppRootSystemProperty(javax.servlet.ServletContext)