Re: Log4j Issue

[Mark Eggers]

Syed,

On 8/9/2016 10:08 PM, Syed Mudassir Ahmed wrote:
> I am using Log4j in my web app to write the logs to a separate file. 
> Surprisingly, that log file is not at all getting created.  I run
> the logger logic as a standalone application and the log file indeed
> gets created.  I am assuming tomcat is not allowing me to write my
> logs to a file.  It is simply redirecting all the log messages to
> catalina.out.  Any suggestions on how to direct my logs to a separate
> file and not to catalina.out.
> 
> Thanks,
> 

Hmm,

Works for me . . .

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration PUBLIC
  'PUBLIC:-//log4j/log4j Configuration//EN'
  'http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/xml/doc-
  files/log4j.dtd'>
<log4j:configuration>
  <appender name="FA" class="org.apache.log4j.FileAppender">
    <param name="File" value="${catalina.base}/logs/leakrs.log"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%d %-5p %c.%M:%L - %m%n"/>
    </layout>
  </appender>
  <logger name="org.mdeggers.leakrs" additivity="false">
    <level value="INFO"/>
    <appender-ref ref="FA"/>
  </logger>
</log4j:configuration>

(sorry for the word wrap for the !DOCTYPE line).

Since log4j 1.x was retired in April of 2015, maybe you should move to
log4j2.

Read the following:

https://logging.apache.org/log4j/2.x/manual/webapp.html

A (more or less) corresponding log4j2.xml file (different app):

<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
    <Appenders>
        <RollingFile name="FA"
            immediateFlush="true"
            fileName="${sys:catalina.base}/logs/logstwo.log"
            filePattern=
             "${sys:catalina.base}/logs/logstwo-%d{yyyy-MM-dd}.log.gz">
            <PatternLayout>
                <Pattern>%d %-5p %c.%M:%L - %m%n</Pattern>
            </PatternLayout>
            <Policies>
                <TimeBasedTriggeringPolicy />
            </Policies>
        </RollingFile>
    </Appenders>
    <Loggers>
        <Logger name="org.mdeggers" level="INFO" additivity="false">
            <AppenderRef ref="FA"/>
        </Logger>
        <Root level="INFO">
            <AppenderRef ref="FA"/>
        </Root>
    </Loggers>
</Configuration>

Note, the log4j2.xml does log rotation, as well as compression of the
rotated log files. It also logs at a package level one higher than the
log4j.xml configuration.

The XML file (log4j.xml or log4j2.xml) goes into WEB-INF/classes, or in
a JAR file in WEB-INF/lib.

The appropriate log4j jar files (different between log4j and log4j2) go
in WEB-INF/lib.

Quite frankly, your question is very broad and without writing a
tutorial it's difficult to answer.

I suggest reading the following as well:

http://www.catb.org/~esr/faqs/smart-questions.html

. . . just my two cents
/mde/

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