Hi Grzegorz,
 As suggested i have added appender and logger template in pax logging
config file, below is the complete config file:
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#    this work for additional information regarding copyright ownership.
#    The ASF licenses this file to You under the Apache License, Version 2.0
#    (the "License"); you may not use this file except in compliance with
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#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
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#    limitations under the License.
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# Colors for log level rendering
color.fatal = bright red
color.error = bright red
color.warn = bright yellow
color.info = bright green
color.debug = cyan
color.trace = cyan

# Common pattern layout for appenders
log4j2.pattern = %d{ISO8601} | %-5p | %-16t | %-32c{1} | %X{bundle.id} -
%X{bundle.name} - %X{bundle.version} | %m%n
log4j2.out.pattern = \u001b[90m%d{HH:mm:ss\.SSS}\u001b[0m
%highlight{%-5level}{FATAL=${color.fatal}, ERROR=${color.error},
WARN=${color.warn}, INFO=${color.info}, DEBUG=${color.debug},
TRACE=${color.trace}} \u001b[90m[%t]\u001b[0m %msg%n%throwable


# Root logger
log4j2.rootLogger.level = INFO, demo
# uncomment to use asynchronous loggers, which require
mvn:com.lmax/disruptor/3.3.2 library
#log4j2.rootLogger.type = asyncRoot
#log4j2.rootLogger.includeLocation = false
log4j2.rootLogger.appenderRef.RollingFile.ref = RollingFile
log4j2.rootLogger.appenderRef.PaxOsgi.ref = PaxOsgi
log4j2.rootLogger.appenderRef.Console.ref = Console
log4j2.rootLogger.appenderRef.Console.filter.threshold.type =
ThresholdFilter
log4j2.rootLogger.appenderRef.Console.filter.threshold.level =
${karaf.log.console:-OFF}

# Loggers configuration

# SSHD logger
log4j2.logger.sshd.name = org.apache.sshd
log4j2.logger.sshd.level = INFO

# Spifly logger
log4j2.logger.spifly.name = org.apache.aries.spifly
log4j2.logger.spifly.level = WARN

# Security audit logger
log4j2.logger.audit.name = audit
log4j2.logger.audit.level = TRACE
log4j2.logger.audit.additivity = false
log4j2.logger.audit.appenderRef.AuditRollingFile.ref = AuditRollingFile


log4j2.logger.demo.name = org.apache.camel
log4j2.logger.demo.level = DEBUG
log4j2.logger.demo.appenderRef.SiftAppender.ref = SiftAppender

# Appenders configuration

# Console appender not used by default (see log4j2.rootLogger.appenderRefs)
log4j2.appender.console.type = Console
log4j2.appender.console.name = Console
log4j2.appender.console.layout.type = PatternLayout
log4j2.appender.console.layout.pattern = ${log4j2.out.pattern}

# Rolling file appender
log4j2.appender.rolling.type = RollingRandomAccessFile
log4j2.appender.rolling.name = RollingFile
log4j2.appender.rolling.fileName = ${karaf.log}/karaf.log
log4j2.appender.rolling.filePattern = ${karaf.log}/karaf.log.%i
# uncomment to not force a disk flush
#log4j2.appender.rolling.immediateFlush = false
log4j2.appender.rolling.append = true
log4j2.appender.rolling.layout.type = PatternLayout
log4j2.appender.rolling.layout.pattern = ${log4j2.out.pattern}
log4j2.appender.rolling.policies.type = Policies
log4j2.appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
log4j2.appender.rolling.policies.size.size = 16MB

# Audit file appender
log4j2.appender.audit.type = RollingRandomAccessFile
log4j2.appender.audit.name = AuditRollingFile
log4j2.appender.audit.fileName = ${karaf.log}/security.log
log4j2.appender.audit.filePattern = ${karaf.log}/security-%i.log
log4j2.appender.audit.append = true
log4j2.appender.audit.layout.type = PatternLayout
log4j2.appender.audit.layout.pattern = %m%n
log4j2.appender.audit.policies.type = Policies
log4j2.appender.audit.policies.size.type = SizeBasedTriggeringPolicy
log4j2.appender.audit.policies.size.size = 8MB

# OSGi appender
log4j2.appender.osgi.type = PaxOsgi
log4j2.appender.osgi.name = PaxOsgi
log4j2.appender.osgi.filter = *

# help with identification of maven-related problems with pax-url-aether
#log4j2.logger.aether.name = shaded.org.eclipse.aether
#log4j2.logger.aether.level = TRACE
#log4j2.logger.http-headers.name = shaded.org.apache.http.headers
#log4j2.logger.http-headers.level = DEBUG
#log4j2.logger.maven.name = org.ops4j.pax.url.mvn
#log4j2.logger.maven.level = TRACE

# Sift appender 
log4j2.appender.mdc.type = Routing 
log4j2.appender.mdc.name = SiftAppender 
log4j2.appender.mdc.routes.type = Routes 
# see: http://logging.apache.org/log4j/2.x/manual/appenders.html#Routes
log4j2.appender.mdc.routes.pattern = $\\{ctx:bundle.name} 
log4j2.appender.mdc.routes.sift.type = Route 
log4j2.appender.mdc.routes.sift.appender.type = RollingRandomAccessFile 
log4j2.appender.mdc.routes.sift.appender.name = RollingFile
log4j2.appender.mdc.routes.sift.appender.fileName =
${karaf.data}/log/sift-$\\{ctx:bundle.name}.log 
log4j2.appender.mdc.routes.sift.appender.filePattern =
${karaf.data}/log/sift-$\\{ctx:bundle.name}-%i.log.gz 
log4j2.appender.mdc.routes.sift.appender.append = true 
log4j2.appender.mdc.routes.sift.appender.layout.type = PatternLayout 
log4j2.appender.mdc.routes.sift.appender.layout.pattern = ${log4j2.pattern} 
log4j2.appender.mdc.routes.sift.appender.policies.type = Policies 
log4j2.appender.mdc.routes.sift.appender.policies.size.type =
SizeBasedTriggeringPolicy 
log4j2.appender.mdc.routes.sift.appender.policies.size.size = 16MB 
log4j2.appender.mdc.routes.sift.appender.strategy.type =
DefaultRolloverStrategy 
log4j2.appender.mdc.routes.sift.appender.strategy.max = 20 


i am getting below exception,

2019-03-28 15:16:57,666 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate plugin type for Routing 
2019-03-28 15:16:57,719 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate plugin for
SizeBasedTriggeringPolicy 
2019-03-28 15:16:57,719 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate plugin for Policies 
2019-03-28 15:16:57,720 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate plugin for
DefaultRolloverStrategy 
2019-03-28 15:16:57,720 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate plugin for PatternLayout 
2019-03-28 15:16:57,720 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate plugin for
RollingRandomAccessFile 
2019-03-28 15:16:57,720 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate plugin for Route 
2019-03-28 15:16:57,720 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate plugin for Routes 
2019-03-28 15:16:57,721 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate plugin for Routing 
2019-03-28 15:16:57,721 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to invoke factory method in class
class org.apache.logging.log4j.core.config.AppendersPlugin for element
Appenders. java.lang.NullPointerException
        at
org.apache.logging.log4j.core.config.plugins.visitors.PluginElementVisitor.visit(PluginElementVisitor.java:52)
        at
org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.generateParameters(PluginBuilder.java:248)
        at
org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:131)
        at
org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:952)
        at
org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:892)
        at
org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:508)
        at
org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:232)
        at
org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:244)
        at
org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:545)
        at
org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:261)
        at
org.ops4j.pax.logging.log4j2.internal.PaxLoggingServiceImpl.doUpdate(PaxLoggingServiceImpl.java:213)
        at
org.ops4j.pax.logging.log4j2.internal.PaxLoggingServiceImpl.updated(PaxLoggingServiceImpl.java:158)
        at
org.ops4j.pax.logging.log4j2.internal.PaxLoggingServiceImpl$1ManagedPaxLoggingService.updated(PaxLoggingServiceImpl.java:426)
        at
org.apache.felix.cm.impl.helper.ManagedServiceTracker.updated(ManagedServiceTracker.java:189)
        at
org.apache.felix.cm.impl.helper.ManagedServiceTracker.updateService(ManagedServiceTracker.java:152)
        at
org.apache.felix.cm.impl.helper.ManagedServiceTracker.provideConfiguration(ManagedServiceTracker.java:85)
        at
org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceUpdate.provide(ConfigurationManager.java:1113)
        at
org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceUpdate.run(ConfigurationManager.java:1069)
        at org.apache.felix.cm.impl.UpdateThread.run0(UpdateThread.java:138)
        at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:105)
        at java.lang.Thread.run(Thread.java:748)

2019-03-28 15:16:57,722 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate appender "PaxOsgi" for
logger config "root"
2019-03-28 15:16:57,723 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate appender "RollingFile"
for logger config "root"
2019-03-28 15:16:57,723 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate appender "Console" for
logger config "root"
2019-03-28 15:16:57,723 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate appender "SiftAppender"
for logger config "org.apache.camel"
2019-03-28 15:16:57,723 CM Configuration Updater (ManagedService Update:
pid=[org.ops4j.pax.logging]) ERROR Unable to locate appender
"AuditRollingFile" for logger config "audit"


I am using karaf-4.2.3 with openjdk 11.,is there anyting i am missing?please
guide me.

Thanks in advance.



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