Log4J2 configuration in 3.0 servlet
Solution 1
As a reference this page describes how to configure Log4j2:
https://logging.apache.org/log4j/2.x/manual/webapp.html#ContextParams
In my case I have not configured any context-param in web.xml. The only thing I had to do was to set the display name:
<display-name>My Admin API</display-name>
I am also using log4j2.yaml instead of xml files and the file is not inside the war. Also notice that in this page https://logging.apache.org/log4j/2.x/manual/webapp.html they say there is a problem with versions of Tomcat < 7.0.43. So either you have to use a newer version of do a specific configuration.
Solution 2
Log4J will look for the log4j2.xml config file in the classpath, unless a location is specified.
Have you tried not specifying the location of the log4j2.xml file (that is, remove the context-param
stuff from web.xml
), and simply relying on putting the config in the classpath? (app.war/WEB-INF/classes/log4j2.xml
looks fine to me)
Note that the file must be named log4j2.xml
and not log4j.xml
.
Leos Literak
Java enthusiast (since 1996), author of www.abclinuxu.cz website (aka stackexchange for czech/slovak linux users), solution architect, developer ..
Updated on July 07, 2022Comments
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Leos Literak almost 2 years
I tried to set up LOG4J according documentation (and related SO questions), but it does not create supposed file, but there is such log in WildFly:
No Log4j context configuration provided. This is very unusual
web.xml
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/classes/log4j2.xml</param-value> </context-param>
app.war/WEB-INF/classes/log4j2.xml
<?xml version="1.0" encoding="UTF-8"?> <Configuration monitorInterval="30"> <!-- http://logging.apache.org/log4j/2.x/manual/configuration.html --> <Properties> <Property name="filename">c:/oauth.log</Property> </Properties> <Filter type="ThresholdFilter" level="trace"/> <Appenders> <Appender type="File" name="File" fileName="${filename}"> <Layout type="PatternLayout"> <Pattern>%d %p %C{1.} [%t] %m%n</Pattern> </Layout> </Appender> <File name="MyFile" fileName="c:/oauth2.log" immediateFlush="true"> <PatternLayout pattern="%d{yyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/> </File> </Appenders> <Loggers> <Logger name="cz.literak.demo" level="debug" additivity="true"> <AppenderRef ref="File"/> </Logger> <Root level="error"> <AppenderRef ref="MyFile"/> </Root> </Loggers> </Configuration>
app.war/WEB-INF/lib
commons-logging-1.1.3.jar json-smart-1.1.1.jar log4j-api-2.0-rc1.jar log4j-core-2.0-rc1.jar log4j-jcl-2.0-rc1.jar
Could you tell me what is wrong? I tried to comment out context param in web.xml and rely on autoconfiguration but there is no change.
EDIT
when I added following code
<context-param> <param-name>log4jContextName</param-name> <param-value>oauthDemo</param-value> </context-param>
it failed differently (I do not have time to investigate now)
07:41:29,269 INFO [io.undertow.servlet] (MSC service thread 1-12) Log4jServletContainerInitializer starting up Log4j in Servlet 3.0+ environment. 07:41:29,644 INFO [stdout] (MSC service thread 1-12) 2014-02-20 07:41:29,643 ERROR FileManager (c:/oauth2.log) java.io.FileNotFoundException: c:\oauth2.log (PĹ™Ăstup byl odepĹ™en) 07:41:29,646 INFO [stdout] (MSC service thread 1-12) 2014-02-20 07:41:29,645 ERROR Unable to invoke method createAppender in class org.apache.logging.log4j.core.appender.FileAppender for element File 07:41:29,647 INFO [stdout] (MSC service thread 1-12) at org.apache.logging.log4j.core.config.BaseConfiguration.createPluginObject(BaseConfiguration.java:913)
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Leos Literak about 10 yearsYes, I did. I removed all params from web.xml and it still did not work. I tried log4j2 Logger and this one worked, so I realized the issue is in commons library integration. I submitted defect: issues.apache.org/jira/browse/LOG4J2-546 with the smallest application where I can reproduce the issue.
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jansohn almost 9 yearsFor me it was also fixed by adding a display name.