Log4j2 using multiple applications and registrars

Question

I need to implement several registrars and several applications. My log4j2.xml looks like this:

  <Appenders>
  <RollingFile name="SYSTEM_LOGGER"
                 fileName="${logging.folder}System.log"
                 filePattern="${ARCHIVE}System.log.%d{dd MMM yyyy HH:mm:ss.SSS}.gz">
        <PatternLayout>
        <Pattern>${PATTERN}</Pattern>
        </PatternLayout>
        <Policies>
            <TimeBasedTriggeringPolicy interval="10" modulate="true"/>
            <SizeBasedTriggeringPolicy size="4 MB" />
            <DefaultRolloverStrategy max="50"/>             
        </Policies>
    </RollingFile>

<Appenders>
<RollingFile name="COMMONREQ_LOGGER"
                 fileName="${logging.folder}/CommonReq.log"
                 filePattern="${ARCHIVE}/CommonReq.log.%d{dd MMM yyyy HH:mm:ss.SSS}.gz">
        <PatternLayout>
        <Pattern>${PATTERN}</Pattern>
        </PatternLayout>
        <Policies>
            <TimeBasedTriggeringPolicy interval="10" modulate="true"/>
            <SizeBasedTriggeringPolicy size="4 MB" />
            <DefaultRolloverStrategy max="50"/>             
        </Policies>
    </RollingFile>

<Appenders>
<RollingFile name="COMMONRES_LOGGER"
                 fileName="${logging.folder}/CommonRes.log"
                 filePattern="${ARCHIVE}/CommonRes.log.%d{dd MMM yyyy HH:mm:ss.SSS}.gz">
        <PatternLayout>
        <Pattern>${PATTERN}</Pattern>
        </PatternLayout>
        <Policies>
            <TimeBasedTriggeringPolicy interval="10" modulate="true"/>
            <SizeBasedTriggeringPolicy size="4 MB" />
            <DefaultRolloverStrategy max="50"/>             
        </Policies>
    </RollingFile>

  <Loggers>
    <Root level="INFO">
        <AppenderRef ref="SYSTEM_LOGGER"/>
        <AppenderRef ref="COMMONREQ_LOGGER"/>
        <AppenderRef ref="COMMONRES_LOGGER"/>
</Root>
</Loggers>

Now when I execute the code using this xml, the log is written to the last CommonRes.log log file. I am new to log4j. How can I write only to the desired log file?

EDIT:

This is what I have done so far in log4j2.xml:

  <Routing name="Routing">
  <Routes pattern="$${ctx:ROUTINGKEY}"> 
  <Route key="$${ctx:ROUTINGKEY}" >
  <RollingFile name="SYSTEM_LOGGER"
                 fileName="${logging.folder}/$${ctx:ROUTINGKEY}.log"
                 filePattern="${ARCHIVE}/$${ctx:ROUTINGKEY}.log.%d{dd MMM yyyy HH:mm:ss.SSS}.gz">
         <PatternLayout>
         <Pattern>${PATTERN}</Pattern>
         </PatternLayout>
         <Policies>
             <TimeBasedTriggeringPolicy interval="10" modulate="true"/>
             <SizeBasedTriggeringPolicy size="4 MB"/>
             <DefaultRolloverStrategy max="50"/>                
         </Policies>
     </RollingFile>
 </Route>
 </Routes>
 </Routing>
<Loggers>
    <Root level="INFO">  
        <AppenderRef ref="Routing" />
    </Root>

And in my java code:

  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    logger = LogManager.getLogger(request.getPathInfo().replace("/", ""));
...
if(logger.getLevel() != null){
                    ThreadContext.put("ROUTINGKEY",  request.getPathInfo().replace("/", ""));

logger.info(contents);                                      
                    } 
  }

When I run the above code, it is not written to any file, instead the following error appears:

ERROR Unknown object "Routing" of type org.apache.logging.log4j.core.appender.routing.RoutingAppender is ignored.
ERROR Unable to locate appender Routing for logger  

Please, help.

Answer 1

ThreadContext, , . - , .

, . :

<Routing name="Routing">
        <Routes pattern="$${ctx:variable}"> 
            <!-- This route is chosen if thread context has no value for key 'variable' -->
            <Route key="$${ctx:variable}">
                <RollingFile name="Rolling-default" fileName="default.log"
                             filePattern="./logs/${date:yyyy-MM}/default-%d{yyyy-MM-dd}-%i.log.gz">
                    <PatternLayout>
                        <pattern>%d{ISO8601} [%t] %p %c{3} - %m%n</pattern>
                    </PatternLayout>
                    <Policies>
                        <TimeBasedTriggeringPolicy interval="6" modulate="true" />
                        <SizeBasedTriggeringPolicy size="10 MB" />
                    </Policies>

                </RollingFile>
            </Route>

            <!-- This route is chosen if thread context has some value for key 'variable' -->       
            <Route>
                <File name="variable-${ctx:variable}" fileName="other.log">

                </File>
            </Route>
        </Routes>
    </Routing> 

fileName = "default.log" fileName = "other.log" - EDIT: appender.

<Loggers>
    <Root level="info">
        <AppenderRef ref="Routing" />
    </Root>
</Loggers>