How can I configure Logback to log different levels for a logger to different destinations

Question

How can I configure Logback to log different levels for a logger to different destinations   For example  given the following Logback configuration  will Logback record INFO messages to STDOUT and ERROR messages to STDERR    Note that this example is a variation of example logback-examples src main java chapters configuration sample4 xml shown in Chapter 3   Logback Configuration     lt configuration gt     lt appender name  STDOUT     class  ch qos logback core ConsoleAppender  gt      lt encoder gt        lt pattern gt           d HH mm ss SSS    thread   -5level  logger 36  -  msg n        lt  pattern gt       lt  encoder gt     lt  appender gt     lt appender name  STDERR     class  ch qos logback core ConsoleAppender  gt      lt encoder gt        lt pattern gt           d HH mm ss SSS    thread   -5level  logger 36  -  msg n        lt  pattern gt       lt  encoder gt       lt target gt System err lt  target gt     lt  appender gt     lt  -- What is the effective level of  chapters configuration   -- gt     lt logger name  chapters configuration  level  INFO  additivity  false  gt       lt appender-ref ref  STDOUT    gt     lt  logger gt     lt logger name  chapters configuration  level  ERROR  additivity  false  gt       lt appender-ref ref  STDERR    gt     lt  logger gt      lt  -- turn OFF all logging  children can override  -- gt     lt root level  OFF  gt       lt appender-ref ref  STDOUT    gt     lt  root gt   lt  configuration gt

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No programming needed  configuration make your life easy   Below is the configuration which logs different level of logs to different files      lt property name  DEV HOME  value    logs    gt    lt appender name  STDOUT  class  ch qos logback core ConsoleAppender  gt       lt filter class  ch qos logback classic filter ThresholdFilter  gt           lt level gt INFO lt  level gt       lt  filter gt       lt layout class  ch qos logback classic PatternLayout  gt           lt Pattern gt               d yyyy-MM-dd HH mm ss   -5level -  msg n          lt  Pattern gt       lt  layout gt   lt  appender gt    lt appender name  FILE-ERROR      class  ch qos logback core rolling RollingFileAppender  gt       lt file gt   DEV HOME  app-error log lt  file gt       lt encoder class  ch qos logback classic encoder PatternLayoutEncoder  gt           lt Pattern gt               d yyyy-MM-dd HH mm ss   -5level -  msg n          lt  Pattern gt       lt  encoder gt        lt rollingPolicy class  ch qos logback core rolling TimeBasedRollingPolicy  gt           lt  -- rollover daily -- gt           lt fileNamePattern gt   DEV HOME  archived app-error  d yyyy-MM-dd   i log          lt  fileNamePattern gt           lt timeBasedFileNamingAndTriggeringPolicy             class  ch qos logback core rolling SizeAndTimeBasedFNATP  gt               lt maxFileSize gt 10MB lt  maxFileSize gt           lt  timeBasedFileNamingAndTriggeringPolicy gt       lt  rollingPolicy gt        lt filter class  ch qos logback classic filter LevelFilter  gt           lt level gt ERROR lt  level gt           lt  --output messages of exact level only -- gt           lt onMatch gt ACCEPT lt  onMatch gt           lt onMismatch gt DENY lt  onMismatch gt       lt  filter gt   lt  appender gt   lt appender name  FILE-INFO      class  ch qos logback core rolling RollingFileAppender  gt       lt file gt   DEV HOME  app-info log lt  file gt       lt encoder class  ch qos logback classic encoder PatternLayoutEncoder  gt           lt Pattern gt               d yyyy-MM-dd HH mm ss   -5level -  msg n          lt  Pattern gt       lt  encoder gt        lt rollingPolicy class  ch qos logback core rolling TimeBasedRollingPolicy  gt           lt  -- rollover daily -- gt           lt fileNamePattern gt   DEV HOME  archived app-info  d yyyy-MM-dd   i log          lt  fileNamePattern gt           lt timeBasedFileNamingAndTriggeringPolicy             class  ch qos logback core rolling SizeAndTimeBasedFNATP  gt               lt maxFileSize gt 10MB lt  maxFileSize gt           lt  timeBasedFileNamingAndTriggeringPolicy gt       lt  rollingPolicy gt         lt filter class  ch qos logback classic filter LevelFilter  gt           lt level gt INFO lt  level gt           lt  --output messages of exact level only -- gt           lt onMatch gt ACCEPT lt  onMatch gt           lt onMismatch gt DENY lt  onMismatch gt       lt  filter gt   lt  appender gt     lt appender name  FILE-DEBUG      class  ch qos logback core rolling RollingFileAppender  gt       lt file gt   DEV HOME  app-debug log lt  file gt       lt encoder class  ch qos logback classic encoder PatternLayoutEncoder  gt           lt Pattern gt               d yyyy-MM-dd HH mm ss    thread   -5level  logger 36  -  msg n          lt  Pattern gt       lt  encoder gt        lt rollingPolicy class  ch qos logback core rolling TimeBasedRollingPolicy  gt           lt  -- rollover daily -- gt           lt fileNamePattern gt   DEV HOME  archived app-debug  d yyyy-MM-dd   i log          lt  fileNamePattern gt           lt timeBasedFileNamingAndTriggeringPolicy             class  ch qos logback core rolling SizeAndTimeBasedFNATP  gt               lt maxFileSize gt 10MB lt  maxFileSize gt           lt  timeBasedFileNamingAndTriggeringPolicy gt       lt  rollingPolicy gt        lt filter class  ch qos logback classic filter LevelFilter  gt           lt level gt DEBUG lt  level gt           lt  --output messages of exact level only -- gt           lt onMatch gt ACCEPT lt  onMatch gt           lt onMismatch gt DENY lt  onMismatch gt       lt  filter gt   lt  appender gt    lt appender name  FILE-ALL      class  ch qos logback core rolling RollingFileAppender  gt       lt file gt   DEV HOME  app log lt  file gt       lt encoder class  ch qos logback classic encoder PatternLayoutEncoder  gt           lt Pattern gt               d yyyy-MM-dd HH mm ss    thread   -5level  logger 36  -  msg n          lt  Pattern gt       lt  encoder gt        lt rollingPolicy class  ch qos logback core rolling TimeBasedRollingPolicy  gt           lt  -- rollover daily -- gt           lt fileNamePattern gt   DEV HOME  archived app  d yyyy-MM-dd   i log          lt  fileNamePattern gt           lt timeBasedFileNamingAndTriggeringPolicy             class  ch qos logback core rolling SizeAndTimeBasedFNATP  gt               lt maxFileSize gt 10MB lt  maxFileSize gt           lt  timeBasedFileNamingAndTriggeringPolicy gt       lt  rollingPolicy gt   lt  appender gt    lt logger name  com abc xyz  level  DEBUG  additivity  true  gt       lt appender-ref ref  FILE-DEBUG    gt       lt appender-ref ref  FILE-INFO    gt       lt appender-ref ref  FILE-ERROR    gt       lt appender-ref ref  FILE-ALL    gt   lt  logger gt    lt root level  INFO  gt       lt appender-ref ref  STDOUT    gt   lt  root gt

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okay  here is my favorite xml way of doing it   I do this for the eclipse version so I can    click on stuff to take me to the log statements and  see info and below in black and warn severe in red   and for some reason SO is not showing this all properly but most seems to be there      lt configuration scan  true  scanPeriod  30 seconds  gt        lt appender name  STDOUT  class  ch qos logback core ConsoleAppender  gt           lt filter class  ch qos logback core filter EvaluatorFilter  gt                   lt evaluator class  ch qos logback classic boolex GEventEvaluator  gt                lt expression gt                 e level toInt    amp lt   INFO toInt                lt  expression gt             lt  evaluator gt             lt OnMismatch gt DENY lt  OnMismatch gt             lt OnMatch gt NEUTRAL lt  OnMatch gt           lt  filter gt            lt encoder gt               lt pattern gt  date ISO8601   X sessionid - X user   caller 1   -4level   message n lt  pattern gt           lt  encoder gt       lt  appender gt        lt appender name  STDERR  class  ch qos logback core ConsoleAppender  gt           lt filter class  ch qos logback classic filter ThresholdFilter  gt                lt level gt warn lt  level gt           lt  filter gt            lt encoder gt               lt pattern gt  date ISO8601   X sessionid - X user   caller 1   -4level   message n lt  pattern gt           lt  encoder gt           lt target gt System err lt  target gt       lt  appender gt        lt root gt           lt level value  INFO    gt           lt appender-ref ref  STDOUT   gt           lt appender-ref ref  STDERR   gt       lt  root gt   lt  configuration gt

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lt configuration scan  true  scanPeriod  60 seconds  gt    lt appender name  A1  class  ch qos logback core rolling RollingFileAppender  gt       lt file gt   storm log dir    logfile name  lt  file gt       lt rollingPolicy class  ch qos logback core rolling FixedWindowRollingPolicy  gt         lt fileNamePattern gt   storm log dir    logfile name   i lt  fileNamePattern gt         lt minIndex gt 1 lt  minIndex gt         lt maxIndex gt 9 lt  maxIndex gt       lt  rollingPolicy gt        lt triggeringPolicy class  ch qos logback core rolling SizeBasedTriggeringPolicy  gt         lt maxFileSize gt 100MB lt  maxFileSize gt       lt  triggeringPolicy gt        lt encoder gt         lt pattern gt  d yyyy-MM-dd T HH mm ss SSSZZ   c 1    p   m n lt  pattern gt       lt  encoder gt    lt  appender gt     lt appender name  ACCESS  class  ch qos logback core rolling RollingFileAppender  gt       lt file gt   storm log dir  access log lt  file gt       lt rollingPolicy class  ch qos logback core rolling FixedWindowRollingPolicy  gt         lt fileNamePattern gt   storm log dir  access log  i lt  fileNamePattern gt         lt minIndex gt 1 lt  minIndex gt         lt maxIndex gt 9 lt  maxIndex gt       lt  rollingPolicy gt        lt triggeringPolicy class  ch qos logback core rolling SizeBasedTriggeringPolicy  gt         lt maxFileSize gt 100MB lt  maxFileSize gt       lt  triggeringPolicy gt        lt encoder gt         lt pattern gt  d yyyy-MM-dd T HH mm ss SSSZZ   c 1    p   m n lt  pattern gt       lt  encoder gt     lt  appender gt      lt appender name  METRICS  class  ch qos logback core rolling RollingFileAppender  gt       lt file gt   storm log dir  metrics log lt  file gt       lt rollingPolicy class  ch qos logback core rolling FixedWindowRollingPolicy  gt         lt fileNamePattern gt   storm log dir  logs metrics log  i lt  fileNamePattern gt         lt minIndex gt 1 lt  minIndex gt         lt maxIndex gt 9 lt  maxIndex gt       lt  rollingPolicy gt        lt triggeringPolicy class  ch qos logback core rolling SizeBasedTriggeringPolicy  gt         lt maxFileSize gt 2MB lt  maxFileSize gt       lt  triggeringPolicy gt        lt encoder gt         lt pattern gt  d  -8r  m n lt  pattern gt       lt  encoder gt     lt  appender gt      lt root level  INFO  gt       lt appender-ref ref  A1   gt     lt  root gt      lt logger name  backtype storm security auth authorizer  additivity  false  gt       lt level value  INFO    gt       lt appender-ref ref  ACCESS    gt     lt  logger gt      lt logger name  backtype storm metric LoggingMetricsConsumer  additivity  false   gt       lt level value  INFO   gt       lt appender-ref ref  METRICS   gt     lt  logger gt    lt  configuration gt   So here is the logback file in which I am not printing backtype storm metric LoggingMetricsConsumer info level if i say additivity    true  then for for all classes in backtype   this rule will be applied

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Update  For an all configuration based approach using Groovy see Dean Hiller s answer   --  You can do some interesting things with Logback filters  The below configuration will only print warn and error messages to stderr  and everything else to stdout   logback xml   lt appender name  stdout  class  ch qos logback core ConsoleAppender  gt     lt target gt System out lt  target gt     lt filter class  com foo StdOutFilter    gt          lt  appender gt    lt appender name  stderr  class  ch qos logback core ConsoleAppender  gt     lt target gt System err lt  target gt     lt filter class  com foo ErrOutFilter    gt          lt  appender gt    lt logger name  mylogger  level  debug  gt       lt appender-ref ref  stdout    gt       lt appender-ref ref  stderr    gt   lt  logger gt    com foo StdOutFilter  public class StdOutFilter extends ch qos logback core filter AbstractMatcherFilter         Override     public FilterReply decide Object event                if   isStarted                          return FilterReply NEUTRAL                     LoggingEvent loggingEvent    LoggingEvent  event           List lt Level gt  eventsToKeep   Arrays asList Level TRACE  Level DEBUG  Level INFO           if  eventsToKeep contains loggingEvent getLevel                           return FilterReply NEUTRAL                    else                       return FilterReply DENY                       com foo ErrOutFilter  public class ErrOutFilter extends ch qos logback core filter AbstractMatcherFilter         Override     public FilterReply decide Object event                if   isStarted                          return FilterReply NEUTRAL                     LoggingEvent loggingEvent    LoggingEvent  event           List lt Level gt  eventsToKeep   Arrays asList Level WARN  Level ERROR           if  eventsToKeep contains loggingEvent getLevel                           return FilterReply NEUTRAL                    else                       return FilterReply DENY

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I believe this would be the simplest solution    lt configuration gt       lt contextName gt selenium-plugin lt  contextName gt       lt  -- Logging configuration -- gt         lt appender name  STDOUT  class  ch qos logback core ConsoleAppender  gt           lt Target gt System out lt  Target gt           lt filter class  ch qos logback classic filter LevelFilter  gt               lt level gt INFO lt  level gt               lt onMatch gt ACCEPT lt  onMatch gt               lt onMismatch gt DENY lt  onMismatch gt           lt  filter gt           lt encoder gt               lt pattern gt   d yyyy-MM-dd HH mm ss SSS     level   msg n lt  pattern gt           lt  encoder gt       lt  appender gt       lt appender name  STDERR  class  ch qos logback core ConsoleAppender  gt               lt Target gt System err lt  Target gt           lt filter class  ch qos logback classic filter LevelFilter  gt               lt level gt ERROR lt  level gt               lt onMatch gt ACCEPT lt  onMatch gt               lt onMismatch gt DENY lt  onMismatch gt           lt  filter gt           lt encoder gt                lt pattern gt   d yyyy-MM-dd HH mm ss SSS     level    thread   logger 10    file  line   msg n lt  pattern gt            lt  encoder gt        lt  appender gt       lt root level  INFO  gt           lt appender-ref ref  STDOUT   gt           lt appender-ref ref  STDERR    gt       lt  root gt   lt  configuration gt

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This is the configuration that I use  which works fine  it is based on XML   JaninoEventEvaluator  requires the Janino library to be added to Classpath    lt configuration gt   lt appender name  STDOUT  class  ch qos logback core ConsoleAppender  gt       lt encoder gt           lt pattern gt  date     -5level  in   file  line  -  msg  n lt  pattern gt       lt  encoder gt       lt filter class  ch qos logback core filter EvaluatorFilter  gt           lt evaluator class  ch qos logback classic boolex JaninoEventEvaluator  gt               lt expression gt                  level  amp lt   INFO              lt  expression gt           lt  evaluator gt           lt OnMismatch gt DENY lt  OnMismatch gt           lt OnMatch gt NEUTRAL lt  OnMatch gt       lt  filter gt   lt  appender gt   lt appender name  STDERR  class  ch qos logback core ConsoleAppender  gt       lt target gt System err lt  target gt       lt encoder gt           lt pattern gt  date     -5level  in   file  line  -  msg  n lt  pattern gt       lt  encoder gt       lt filter class  ch qos logback classic filter ThresholdFilter  gt           lt level gt WARN lt  level gt       lt  filter gt   lt  appender gt    lt root level  DEBUG  gt       lt appender-ref ref  STDOUT    gt       lt appender-ref ref  STDERR    gt   lt  root gt   lt  configuration gt

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I take no credit for this answer  as it s merely a combination of the best two answers above  that of X  Wo Satuk and that of S  bastien Helbert  ThresholdFilter is lovely but you can t configure it to have an upper level as well as a lower level   but combining it with two LevelFilters set to  DENY  WARN and ERROR works a treat   Very important  do not forget the  lt target gt System err lt  target gt  tag in the STDERR appender  my omission of it had me frustrated for a few minutes    lt configuration gt       lt timestamp key  byDay  datePattern  yyyyMMdd T HHmmss    gt       lt appender name  STDOUT  class  ch qos logback core ConsoleAppender  gt           lt filter class  ch qos logback classic filter ThresholdFilter  gt               lt level gt INFO lt  level gt           lt  filter gt           lt filter class  ch qos logback classic filter LevelFilter  gt               lt level gt WARN lt  level gt               lt onMatch gt DENY lt  onMatch gt           lt  filter gt           lt filter class  ch qos logback classic filter LevelFilter  gt               lt level gt ERROR lt  level gt               lt onMatch gt DENY lt  onMatch gt           lt  filter gt           lt encoder gt               lt pattern gt  d HH mm ss SSS    thread   -5level  logger 36   M   line                   -  msg n              lt  pattern gt           lt  encoder gt       lt  appender gt        lt appender name  STDERR  class  ch qos logback core ConsoleAppender  gt           lt filter class  ch qos logback classic filter ThresholdFilter  gt               lt level gt WARN lt  level gt           lt  filter gt           lt target gt System err lt  target gt           lt encoder gt               lt pattern gt  d HH mm ss SSS    thread   -5level  logger 36   M   line                   -  msg n              lt  pattern gt           lt  encoder gt       lt  appender gt        lt root level  debug  gt           lt appender-ref ref  STDOUT    gt           lt appender-ref ref  STDERR    gt       lt  root gt   lt  configuration gt      it does however have a method decide in the API but I haven t a clue how you d use it in this context

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Example of how to output colored messages of level  INFO  or higher to console and messages of level  WARN  or higher to file   Your logback xml file    lt  xml version  1 0  encoding  UTF-8   gt    lt configuration gt       lt include resource  org springframework boot logging logback defaults xml   gt        lt appender name  STDOUT  class  ch qos logback core ConsoleAppender  gt           lt filter class  ch qos logback classic filter LevelFilter  gt               lt level gt INFO lt  level gt                lt  --output messages of exact level only-- gt               lt  -- lt onMatch gt ACCEPT lt  onMatch gt -- gt               lt  -- lt onMismatch gt DENY lt  onMismatch gt -- gt           lt  filter gt           lt encoder gt               lt pattern gt  d yyyy-MMM-dd HH mm ss SSS    thread   highlight  -5level   cyan  logger 15   -  msg  n              lt  pattern gt           lt  encoder gt       lt  appender gt        lt appender name  FILE  class  ch qos logback core FileAppender  gt           lt file gt myfile log lt  file gt           lt filter class  ch qos logback classic filter ThresholdFilter  gt               lt level gt WARN lt  level gt           lt  filter gt           lt append gt true lt  append gt           lt encoder gt               lt pattern gt  d yyyy-MMM-dd HH mm ss SSS   -5level   thread   logger 15  -  msg n lt  pattern gt           lt  encoder gt       lt  appender gt        lt root level  INFO  gt           lt appender-ref ref  STDOUT    gt           lt appender-ref ref  FILE   gt       lt  root gt   lt  configuration gt

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Solution based on configuration only  with a ThresoldFilter and LevelFilters to keep things really simple to understand      lt configuration gt       lt appender name  STDERR  class  ch qos logback core ConsoleAppender  gt           lt target gt System err lt  target gt           lt filter class  ch qos logback classic filter ThresholdFilter  gt             lt level gt WARN lt  level gt           lt  filter gt           lt encoder gt               lt pattern gt  date  level   thread   logger  msg n lt  pattern gt           lt  encoder gt       lt  appender gt        lt appender name  STDOUT  class  ch qos logback core ConsoleAppender  gt           lt target gt System out lt  target gt           lt filter class  ch qos logback classic filter LevelFilter  gt             lt level gt DEBUG lt  level gt             lt onMatch gt ACCEPT lt  onMatch gt           lt  filter gt           lt filter class  ch qos logback classic filter LevelFilter  gt             lt level gt INFO lt  level gt             lt onMatch gt ACCEPT lt  onMatch gt           lt  filter gt           lt filter class  ch qos logback classic filter LevelFilter  gt             lt level gt TRACE lt  level gt             lt onMatch gt ACCEPT lt  onMatch gt           lt  filter gt           lt filter class  ch qos logback classic filter LevelFilter  gt             lt level gt WARN lt  level gt             lt onMatch gt DENY lt  onMatch gt           lt  filter gt           lt filter class  ch qos logback classic filter LevelFilter  gt             lt level gt ERROR lt  level gt             lt onMatch gt DENY lt  onMatch gt           lt  filter gt           lt encoder gt               lt pattern gt  date  level   thread   logger  msg n lt  pattern gt           lt  encoder gt       lt  appender gt        lt root level  INFO  gt           lt appender-ref ref  STDOUT    gt           lt appender-ref ref  STDERR    gt       lt  root gt   lt  configuration gt

User · Answer

I use logback groovy to configure my logback but you can do it with xml config as well   import static ch qos logback classic Level   import static ch qos logback core spi FilterReply DENY import static ch qos logback core spi FilterReply NEUTRAL import ch qos logback classic boolex GEventEvaluator import ch qos logback classic encoder PatternLayoutEncoder import ch qos logback core ConsoleAppender import ch qos logback core filter EvaluatorFilter  def patternExpression     date ISO8601    5level   msg n   appender  STDERR   ConsoleAppender        filter EvaluatorFilter          evaluator GEventEvaluator            expression    e level toInt    gt   WARN toInt                  onMatch   NEUTRAL       onMismatch   DENY           encoder PatternLayoutEncoder          pattern   patternExpression           target    System err       appender  STDOUT   ConsoleAppender        filter EvaluatorFilter          evaluator GEventEvaluator            expression    e level toInt    lt  WARN toInt                  onMismatch   DENY       onMatch   NEUTRAL           encoder PatternLayoutEncoder          pattern   patternExpression           target    System out     logger  org hibernate type   WARN  logger  org hibernate   WARN  logger  org springframework   WARN   root INFO   STDERR   STDOUT      I think to use GEventEvaluator is simplier because there is no need to create filter classes  I apologize for my English

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The simplest solution is to use ThresholdFilter on the appenders        lt appender name       class       gt           lt filter class  ch qos logback classic filter ThresholdFilter  gt               lt level gt INFO lt  level gt           lt  filter gt    Full example    lt configuration gt       lt appender name  STDOUT  class  ch qos logback core ConsoleAppender  gt           lt filter class  ch qos logback classic filter ThresholdFilter  gt               lt level gt INFO lt  level gt           lt  filter gt           lt encoder gt               lt pattern gt  d  -5level   msg n lt  pattern gt           lt  encoder gt       lt  appender gt        lt appender name  STDERR  class  ch qos logback core ConsoleAppender  gt           lt filter class  ch qos logback classic filter ThresholdFilter  gt               lt level gt ERROR lt  level gt           lt  filter gt           lt target gt System err lt  target gt           lt encoder gt               lt pattern gt  d  -5level   msg n lt  pattern gt           lt  encoder gt       lt  appender gt        lt root gt           lt appender-ref ref  STDOUT    gt           lt appender-ref ref  STDERR    gt       lt  root gt   lt  configuration gt    Update  As Mike pointed out in the comment  messages with ERROR level are printed here both to STDOUT and STDERR  Not sure what was the OP s intent  though  You can try Mike s answer if this is not what you wanted

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Try this  You can just use built-in ThresholdFilter and LevelFilter  No need to create your own filters programmically  In this example WARN and ERROR levels are logged to System err and rest to System out            lt appender name  stdout  class  ch qos logback core ConsoleAppender  gt       lt  -- deny ERROR level -- gt       lt filter class  ch qos logback classic filter LevelFilter  gt           lt level gt ERROR lt  level gt           lt onMatch gt DENY lt  onMatch gt       lt  filter gt       lt  -- deny WARN level -- gt       lt filter class  ch qos logback classic filter LevelFilter  gt           lt level gt WARN lt  level gt           lt onMatch gt DENY lt  onMatch gt       lt  filter gt       lt target gt System out lt  target gt       lt immediateFlush gt true lt  immediateFlush gt       lt encoder gt           lt charset gt utf-8 lt  charset gt           lt pattern gt   msg pattern  lt  pattern gt       lt  encoder gt   lt  appender gt    lt appender name  stderr  class  ch qos logback core ConsoleAppender  gt       lt  -- deny all events with a level below WARN  that is INFO  DEBUG and TRACE -- gt       lt filter class  ch qos logback classic filter ThresholdFilter  gt           lt level gt WARN lt  level gt       lt  filter gt       lt target gt System err lt  target gt       lt immediateFlush gt true lt  immediateFlush gt       lt encoder gt           lt charset gt utf-8 lt  charset gt           lt pattern gt   msg pattern  lt  pattern gt       lt  encoder gt   lt  appender gt       lt root level  WARN  gt       lt appender-ref ref  stderr   gt   lt  root gt    lt root level  TRACE  gt       lt appender-ref ref  stdout   gt   lt  root gt

[java] How can I configure Logback to log different levels for a logger to different destinations?

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