doConfigure. The configuration file consists of statements in the format key=value. The syntax of different configuration elements are discussed below.
The repository-wide threshold filters logging requests by level regardless of logger. The syntax is:
log4j.threshold=[level]
The level value can consist of the string values OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL or a custom level value. A custom level value can be specified in the form level#classname. By default the repository-wide threshold is set to the lowest possible value, namely the level ALL.
Appender configuration syntax is:
# For appender named appenderName, set its class. # Note: The appender name can contain dots. log4j.appender.appenderName=fully.qualified.name.of.appender.class # Set appender specific options. log4j.appender.appenderName.option1=value1 ... log4j.appender.appenderName.optionN=valueNFor each named appender you can configure its {@link Layout}. The syntax for configuring an appender's layout is:
log4j.appender.appenderName.layout=fully.qualified.name.of.layout.class log4j.appender.appenderName.layout.option1=value1 .... log4j.appender.appenderName.layout.optionN=valueN
The syntax for configuring the root logger is:
log4j.rootLogger=[level], appenderName, appenderName, ...
This syntax means that an optional level can be supplied followed by appender names separated by commas.
The level value can consist of the string values OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL or a custom level value. A custom level value can be specified in the form level#classname.
If a level value is specified, then the root level is set to the corresponding level. If no level value is specified, then the root level remains untouched.
The root logger can be assigned multiple appenders.
Each appenderName (separated by commas) will be added to the root logger. The named appender is defined using the appender syntax defined above.
For non-root categories the syntax is almost the same:
log4j.logger.logger_name=[level|INHERITED|NULL], appenderName, appenderName, ...
The meaning of the optional level value is discussed above in relation to the root logger. In addition however, the value INHERITED can be specified meaning that the named logger should inherit its level from the logger hierarchy.
If no level value is supplied, then the level of the named logger remains untouched.
By default categories inherit their level from the hierarchy. However, if you set the level of a logger and later decide that that logger should inherit its level, then you should specify INHERITED as the value for the level value. NULL is a synonym for INHERITED.
Similar to the root logger syntax, each appenderName (separated by commas) will be attached to the named logger.
See the appender additivity rule in the user manual for the meaning of the additivity flag.
The syntax is:
log4j.renderer.fully.qualified.name.of.rendered.class=fully.qualified.name.of.rendering.classAs in,
log4j.renderer.my.Fruit=my.FruitRenderer
An example configuration is given below. Other configuration file examples are given in the examples folder.
# Set options for appender named "A1". # Appender "A1" will be a SyslogAppender log4j.appender.A1=org.apache.log4j.net.SyslogAppender # The syslog daemon resides on www.abc.net log4j.appender.A1.SyslogHost=www.abc.net # A1's layout is a PatternLayout, using the conversion pattern # %r %-5p %c{2} %M.%L %x - %m\n. Thus, the log output will # include # the relative time since the start of the application in # milliseconds, followed by the level of the log request, # followed by the two rightmost components of the logger name, # followed by the callers method name, followed by the line number, # the nested disgnostic context and finally the message itself. # Refer to the documentation of {@link PatternLayout} for further information# on the syntax of the ConversionPattern key. log4j.appender.A1.layout=org.apache.log4j.PatternLayout log4j.appender.A1.layout.ConversionPattern=%-4r %-5p %c{2} %M.%L %x - %m\n # Set options for appender named "A2" # A2 should be a RollingFileAppender, with maximum file size of 10 MB # using at most one backup file. A2's layout is TTCC, using the # ISO8061 date format with context printing enabled. log4j.appender.A2=org.apache.log4j.RollingFileAppender log4j.appender.A2.MaxFileSize=10MB log4j.appender.A2.MaxBackupIndex=1 log4j.appender.A2.layout=org.apache.log4j.TTCCLayout log4j.appender.A2.layout.ContextPrinting=enabled log4j.appender.A2.layout.DateFormat=ISO8601 # Root logger set to DEBUG using the A2 appender defined above. log4j.rootLogger=DEBUG, A2 # Logger definitions: # The SECURITY logger inherits is level from root. However, it's output # will go to A1 appender defined above. It's additivity is non-cumulative. log4j.logger.SECURITY=INHERITED, A1 log4j.additivity.SECURITY=false # Only warnings or above will be logged for the logger "SECURITY.access". # Output will go to A1. log4j.logger.SECURITY.access=WARN # The logger "class.of.the.day" inherits its level from the # logger hierarchy. Output will go to the appender's of the root # logger, A2 in this case. log4j.logger.class.of.the.day=INHERITED Refer to the setOption method in each Appender and Layout for class specific options.
Use the # or ! characters at the beginning of a line for comments.
@param configFileName The name of the configuration file where theconfiguration information is stored.
hierarchy parameter.
@param url The URL to parse
@param repository The repository to operate upon.
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