Hello ,
I need to log the stack trace of an exception from specific processor into a
new log file "new.log"

that's the changes I made into  "org.ops4j.pax.logging.cfg"  

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# Root logger
log4j.rootLogger=INFO, out,osgi:VmLogAppender
log4j.logger.new=INFO,new
log4j.throwableRenderer=org.apache.log4j.OsgiThrowableRenderer

# CONSOLE appender not used by default
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} | %-5.5p |
%-16.16t | %-32.32c{1} | %-32.32C %4L | %X{bundle.id} - %X{bundle.name} -
%X{bundle.version} | %m%n



# new File appender
#log4j.rootLogger=INFO,new
log4j.appender.new=org.apache.log4j.RollingFileAppender 
log4j.appender.new.layout=org.apache.log4j.PatternLayout 
log4j.appender.new.layout.ConversionPattern=%d{ABSOLUTE} | %-5.5p | %-16.16t
| %-32.32c{1} | %-32.32C %4L | %X{bundle.id} - %X{bundle.name} -
%X{bundle.version} | %m%n 
log4j.appender.new.file=${karaf.data}/log/new.log 
log4j.appender.new.append=true 
log4j.appender.new.maxFileSize=1MB 
log4j.appender.new.maxBackupIndex=10 

# File appender
log4j.appender.out=org.apache.log4j.RollingFileAppender
log4j.appender.out.layout=org.apache.log4j.PatternLayout
log4j.appender.out.layout.ConversionPattern=%d{ABSOLUTE} | %-5.5p | %-16.16t
| %-32.32c{1} | %-32.32C %4L | %X{bundle.id} - %X{bundle.name} -
%X{bundle.version} | %m%n
log4j.appender.out.file=${karaf.data}/log/karaf.log
log4j.appender.out.append=true
log4j.appender.out.maxFileSize=1MB
log4j.appender.out.maxBackupIndex=10



# Sift appender
log4j.appender.sift=org.apache.log4j.sift.MDCSiftingAppender
log4j.appender.sift.key=bundle.name
log4j.appender.sift.default=karaf
log4j.appender.sift.appender=org.apache.log4j.FileAppender
log4j.appender.sift.appender.layout=org.apache.log4j.PatternLayout
log4j.appender.sift.appender.layout.ConversionPattern=%d{ABSOLUTE} | %-5.5p
| %-16.16t | %-32.32c{1} | %-32.32C %4L | %m%n
log4j.appender.sift.appender.file=${karaf.data}/log/$\\{bundle.name\\}.log
log4j.appender.sift.appender.append=true



Into the process I have the following : 

  val exception: Exception = exchange.getProperty(Exchange.EXCEPTION_CAUGHT,
classOf[Exception])
    logger.log("Hello new log",exception,LoggingLevel.ERROR)

That's the route I use 

  
this.onException(classOf[Excption]).process(exceptionProcessor).log(LoggingLevel.INFO,"new","HelloZ
New Logger")

What I get now is everything logs into karaf.log .
"new.log" has just the message I wrote :

15:00:23,633 | INFO  | qtp25311303-70   | new                             |
rg.apache.camel.processor.Logger  213 | 51 - org.apache.camel.camel-core -
2.6.0 | HelloZ New  Logger

How could I log the stack trace into the "new.log" as well 




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