Different Log Levels For Different Appenders?
So suppose I set my root logger to error, but I want to have another logger operate at debug level. When I do that it makes that loggers level debug for all appenders. For example take the following <configuration> <appender name="*FILE*" .... </appender> <appender name="*STDOUT*" ... </appender> <logger name="mylogger"> <level value="debug" /> ** <appender-ref ref="FILE" />** </logger> <root> <level value="error" />* <appender-ref ref="STDOUT" />* </root> </configuration> In this example mylogger would output at debug level to BOTH STDOUT and FILE. Is it possible to only get mylogger to output at debug level to FILE and error to STDOUT? I realize that I can add a filter to the STDOUT appender to filter anything below ERROR, but I was curious if there was another way to do this, possibly cleaner? -Eric
Hello Eric, I think this is described in chapter 3 of the manual. See "Example 3.9: Logger level sample (logback-examples/src/main/java/chapter3/sample4.xml)". The list numbering in that chapter only works with Firefox. So on other browsers you might see all examples numbered as "3.". See also the next section in the same chapter, on "Configuring Appenders", in particular, the cumulative addition of appenders. It might be the other "cleaner" way, you are looking for. HTH, Eric Faden wrote:
So suppose I set my root logger to error, but I want to have another logger operate at debug level. When I do that it makes that loggers level debug for all appenders. For example take the following
<configuration>
<appender name="*FILE*" .... </appender>
<appender name="*STDOUT*" ... </appender>
<logger name="mylogger"> <level value="debug" /> ** <appender-ref ref="FILE" />** </logger>
<root> <level value="error" />* <appender-ref ref="STDOUT" />* </root> </configuration>
In this example mylogger would output at debug level to BOTH STDOUT and FILE. Is it possible to only get mylogger to output at debug level to FILE and error to STDOUT? I realize that I can add a filter to the STDOUT appender to filter anything below ERROR, but I was curious if there was another way to do this, possibly cleaner?
-Eric
-- Ceki Gülcü
That doesn't exactly solve what I am trying to do. The problem isn't that I can't get the correct level on a specific logger, the problem is more that I want to have a specific logger go to two different appenders and log at different levels based on the appender. For example I want to have the root logger log at level INFO to the Console. I then want to have the logger for some class Blah log to the appender for root (Console) at the level of root (INFO), but also log to a file Foo.txt at level Debug. So far as I can tell the only way to do this is to set the level of Blah to debug, have a file appender, and also put a filter on the console appender to filter out things below INFO. Does that make sense what I am trying to do? Basically I want a single logger to log to different levels to different appenders. -Eric Ceki Gulcu wrote:
Hello Eric,
I think this is described in chapter 3 of the manual. See "Example 3.9: Logger level sample (logback-examples/src/main/java/chapter3/sample4.xml)". The list numbering in that chapter only works with Firefox. So on other browsers you might see all examples numbered as "3.". See also the next section in the same chapter, on "Configuring Appenders", in particular, the cumulative addition of appenders. It might be the other "cleaner" way, you are looking for.
HTH,
Eric Faden wrote:
So suppose I set my root logger to error, but I want to have another logger operate at debug level. When I do that it makes that loggers level debug for all appenders. For example take the following
<configuration>
<appender name="*FILE*" .... </appender>
<appender name="*STDOUT*" ... </appender>
<logger name="mylogger"> <level value="debug" /> ** <appender-ref ref="FILE" />** </logger>
<root> <level value="error" />* <appender-ref ref="STDOUT" />* </root> </configuration>
In this example mylogger would output at debug level to BOTH STDOUT and FILE. Is it possible to only get mylogger to output at debug level to FILE and error to STDOUT? I realize that I can add a filter to the STDOUT appender to filter anything below ERROR, but I was curious if there was another way to do this, possibly cleaner?
-Eric
I also wanted to do exactly what you are trying to do. I discovered the only way to do this is with a filter on the appender, instead of being able to set the Level on the appender as you could do with log4j. I don't know yet which method is "better", but the ability to set a filter on the appender does give me the same end-result as with log4j, so I am satisfied with this method. Rob Ross, Lead Software Engineer E! Networks --------------------------------------------------- "Beware of he who would deny you access to information, for in his heart he dreams himself your master." -- Commissioner Pravin Lal On Aug 28, 2008, at 7:01 AM, Eric Faden wrote:
That doesn't exactly solve what I am trying to do. The problem isn't that I can't get the correct level on a specific logger, the problem is more that I want to have a specific logger go to two different appenders and log at different levels based on the appender. For example I want to have the root logger log at level INFO to the Console. I then want to have the logger for some class Blah log to the appender for root (Console) at the level of root (INFO), but also log to a file Foo.txt at level Debug. So far as I can tell the only way to do this is to set the level of Blah to debug, have a file appender, and also put a filter on the console appender to filter out things below INFO. Does that make sense what I am trying to do? Basically I want a single logger to log to different levels to different appenders.
-Eric
Ceki Gulcu wrote:
Hello Eric,
I think this is described in chapter 3 of the manual. See "Example 3.9: Logger level sample (logback-examples/src/main/java/chapter3/ sample4.xml)". The list numbering in that chapter only works with Firefox. So on other browsers you might see all examples numbered as "3.". See also the next section in the same chapter, on "Configuring Appenders", in particular, the cumulative addition of appenders. It might be the other "cleaner" way, you are looking for.
HTH,
Eric Faden wrote:
So suppose I set my root logger to error, but I want to have another logger operate at debug level. When I do that it makes that loggers level debug for all appenders. For example take the following
<configuration>
<appender name="*FILE*" .... </appender>
<appender name="*STDOUT*" ... </appender>
<logger name="mylogger"> <level value="debug" /> ** <appender-ref ref="FILE" />** </logger>
<root> <level value="error" />* <appender-ref ref="STDOUT" />* </root> </configuration>
In this example mylogger would output at debug level to BOTH STDOUT and FILE. Is it possible to only get mylogger to output at debug level to FILE and error to STDOUT? I realize that I can add a filter to the STDOUT appender to filter anything below ERROR, but I was curious if there was another way to do this, possibly cleaner?
-Eric
_______________________________________________ Logback-user mailing list Logback-user@qos.ch http://qos.ch/mailman/listinfo/logback-user
Contrary to log4j, logback appenders do not automatically inherit a threshold filter. You probably don't care but this has to do with the fact that the functionality offered by log4j is assumed by two separate modules, logback-core and logback-classic. Logback-core, where several appenders (e.g. FileAppender) are defined, does not really know about logging. Both the Logger and Level classes are defined in logback-classic and not in logback-core. In order to avoid duplicated code, FileAppender is defined only in logback-core and not in logback-classic. It's LoggingEvent specific layouts and filters defined in logback-classic that give a FileAppender instance its "logging-aware" behavior. Anyway, to cut a long story short, it could have been possible to redefine FileAppender in logback-classic in order to add a threshold-filter. But as it is possible to accomplish the same by setting a "c.q.l.clas.filter.ThresholdFilter" in a configuration file, we traded shorter configuration syntax in favor of not not duplicating code. Anyway, see logback-examples/src/main/java/chapter6/ThresholdFilterConfig.xml for an example. It really has the same effect as the threshold keyword in log4j. Rob Ross wrote:
I also wanted to do exactly what you are trying to do. I discovered the only way to do this is with a filter on the appender, instead of being able to set the Level on the appender as you could do with log4j.
I don't know yet which method is "better", but the ability to set a filter on the appender does give me the same end-result as with log4j, so I am satisfied with this method.
Rob Ross, Lead Software Engineer E! Networks
--------------------------------------------------- "Beware of he who would deny you access to information, for in his heart he dreams himself your master." -- Commissioner Pravin Lal
On Aug 28, 2008, at 7:01 AM, Eric Faden wrote:
That doesn't exactly solve what I am trying to do. The problem isn't that I can't get the correct level on a specific logger, the problem is more that I want to have a specific logger go to two different appenders and log at different levels based on the appender. For example I want to have the root logger log at level INFO to the Console. I then want to have the logger for some class Blah log to the appender for root (Console) at the level of root (INFO), but also log to a file Foo.txt at level Debug. So far as I can tell the only way to do this is to set the level of Blah to debug, have a file appender, and also put a filter on the console appender to filter out things below INFO. Does that make sense what I am trying to do? Basically I want a single logger to log to different levels to different appenders.
-Eric
Ceki Gulcu wrote:
Hello Eric,
I think this is described in chapter 3 of the manual. See "Example 3.9: Logger level sample (logback-examples/src/main/java/chapter3/ sample4.xml)". The list numbering in that chapter only works with Firefox. So on other browsers you might see all examples numbered as "3.". See also the next section in the same chapter, on "Configuring Appenders", in particular, the cumulative addition of appenders. It might be the other "cleaner" way, you are looking for.
HTH,
Eric Faden wrote:
So suppose I set my root logger to error, but I want to have another logger operate at debug level. When I do that it makes that loggers level debug for all appenders. For example take the following
<configuration>
<appender name="*FILE*" .... </appender>
<appender name="*STDOUT*" ... </appender>
<logger name="mylogger"> <level value="debug" /> ** <appender-ref ref="FILE" />** </logger>
<root> <level value="error" />* <appender-ref ref="STDOUT" />* </root> </configuration>
In this example mylogger would output at debug level to BOTH STDOUT and FILE. Is it possible to only get mylogger to output at debug level to FILE and error to STDOUT? I realize that I can add a filter to the STDOUT appender to filter anything below ERROR, but I was curious if there was another way to do this, possibly cleaner?
-Eric
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_______________________________________________ Logback-user mailing list Logback-user@qos.ch http://qos.ch/mailman/listinfo/logback-user
-- Ceki Gülcü
Seems reasonable. I was just double checking that it was the correct way to do it. Thanks. -Eric Ceki Gulcu wrote:
Contrary to log4j, logback appenders do not automatically inherit a threshold filter. You probably don't care but this has to do with the fact that the functionality offered by log4j is assumed by two separate modules, logback-core and logback-classic. Logback-core, where several appenders (e.g. FileAppender) are defined, does not really know about logging. Both the Logger and Level classes are defined in logback-classic and not in logback-core. In order to avoid duplicated code, FileAppender is defined only in logback-core and not in logback-classic. It's LoggingEvent specific layouts and filters defined in logback-classic that give a FileAppender instance its "logging-aware" behavior.
Anyway, to cut a long story short, it could have been possible to redefine FileAppender in logback-classic in order to add a threshold-filter. But as it is possible to accomplish the same by setting a "c.q.l.clas.filter.ThresholdFilter" in a configuration file, we traded shorter configuration syntax in favor of not not duplicating code.
Anyway, see logback-examples/src/main/java/chapter6/ThresholdFilterConfig.xml for an example. It really has the same effect as the threshold keyword in log4j.
Rob Ross wrote:
I also wanted to do exactly what you are trying to do. I discovered the only way to do this is with a filter on the appender, instead of being able to set the Level on the appender as you could do with log4j.
I don't know yet which method is "better", but the ability to set a filter on the appender does give me the same end-result as with log4j, so I am satisfied with this method.
Rob Ross, Lead Software Engineer E! Networks
--------------------------------------------------- "Beware of he who would deny you access to information, for in his heart he dreams himself your master." -- Commissioner Pravin Lal
On Aug 28, 2008, at 7:01 AM, Eric Faden wrote:
That doesn't exactly solve what I am trying to do. The problem isn't that I can't get the correct level on a specific logger, the problem is more that I want to have a specific logger go to two different appenders and log at different levels based on the appender. For example I want to have the root logger log at level INFO to the Console. I then want to have the logger for some class Blah log to the appender for root (Console) at the level of root (INFO), but also log to a file Foo.txt at level Debug. So far as I can tell the only way to do this is to set the level of Blah to debug, have a file appender, and also put a filter on the console appender to filter out things below INFO. Does that make sense what I am trying to do? Basically I want a single logger to log to different levels to different appenders.
-Eric
Ceki Gulcu wrote:
Hello Eric,
I think this is described in chapter 3 of the manual. See "Example 3.9: Logger level sample (logback-examples/src/main/java/chapter3/ sample4.xml)". The list numbering in that chapter only works with Firefox. So on other browsers you might see all examples numbered as "3.". See also the next section in the same chapter, on "Configuring Appenders", in particular, the cumulative addition of appenders. It might be the other "cleaner" way, you are looking for.
HTH,
Eric Faden wrote:
So suppose I set my root logger to error, but I want to have another logger operate at debug level. When I do that it makes that loggers level debug for all appenders. For example take the following
<configuration>
<appender name="*FILE*" .... </appender>
<appender name="*STDOUT*" ... </appender>
<logger name="mylogger"> <level value="debug" /> ** <appender-ref ref="FILE" />** </logger>
<root> <level value="error" />* <appender-ref ref="STDOUT" />* </root> </configuration>
In this example mylogger would output at debug level to BOTH STDOUT and FILE. Is it possible to only get mylogger to output at debug level to FILE and error to STDOUT? I realize that I can add a filter to the STDOUT appender to filter anything below ERROR, but I was curious if there was another way to do this, possibly cleaner?
-Eric
Logback-user mailing list Logback-user@qos.ch http://qos.ch/mailman/listinfo/logback-user
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participants (3)
-
Ceki Gulcu -
Eric Faden -
Rob Ross