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You can also configure log4j in an xml format. This is required if you want to use some of the new features from apache-log4j-extra, such as the TimeBasedRollingPolicy, which rolls your files at midnight and gzips them!
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<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <!-- Note that this file is refreshed by the server every 60seconds, as specified in web.xml --> <log4j:configuration debug="true"> <appender name="ROLL" class="org.apache.log4j.rolling.RollingFileAppender"> <!-- The active file to log to --> <param name="file" value="/applogs/myportal/portal.log" /> <param name="append" value="true" /> <param name="encoding" value="UTF-8" /> <rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy"> <!-- The file to roll to, this is a fairly intelligent parameter, if the file ends in .gz, it gzips it, based on the date stamp it rolls at that time, default is yyyy-MM-dd, (rolls at midnight) See: http://logging.apache.org/log4j/companions/extras/apidocs/org/apache/log4j/rolling/TimeBasedRollingPolicy.html --> <param name="FileNamePattern" value="/applogs/myportal/portal.%d.log.gz" /> </rollingPolicy> <layout class="org.apache.log4j.PatternLayout"> <!-- The log message pattern --> <param name="ConversionPattern" value="%5p %d{ISO8601} [%t][%x] %c - %m%n" /> </layout> </appender> <!-- Loggers to filter out various class paths --> <logger name="org.hibernate.engine.loading.LoadContexts" additivity="false"> <level value="error"/> <appender-ref ref="ROLL" /> </logger> <!-- Debugging loggers --> <!-- Uncomment to enable debug on calpoly code only --> <!-- <logger name="edu.calpoly"> <level value="debug"/> <appender-ref ref="ROLL" /> </logger> --> <root> <priority value="info" /> <appender-ref ref="ROLL" /> </root> </log4j:configuration> |
Note that you can also do advanced filtering on message contents with <filter /> but the documentation is a bit scarce and I had no need for it. (This is something you couldn't do with log4j.properties)
Modify web.xml
Modify the web.xml file in the same directory and change log4j.properties to log4j.xml:
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<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/log4j.xml</param-value>
</context-param>
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Add the apache-log4j-extra dependency to Maven
If you want to use TimeBasedRollingPolicy you'll need to add apache-log4j-extra to your pom.xml files:
Edit the root pom.xml:
Add a version line in the appropriate spot:
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<log4j.extras.version>1.0</log4j.extras.version>
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Further down add a dependency section bellow the main log4j one:
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<dependency>
<groupId>log4j</groupId>
<artifactId>apache-log4j-extras</artifactId>
<version>${log4j.extras.version}</version>
</dependency>
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Now edit uportal-war/pom.xml
Add the following section:
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<!-- ===== Runtime Time Dependencies ============================== -->
<dependency>
<groupId>log4j</groupId>
<artifactId>apache-log4j-extras</artifactId>
<scope>runtime</scope>
/dependency>
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