By Ceki Gulcu
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Extra info for Log4j. The Complete Manual, XZ
The value attribute can be one of the strings “DEBUG”, “INFO”, WARN” “ERROR” or “FATAL”. The special case-insensitive value “INHERITED”, or its synonym “NULL”, will force the level of the logger to be inherited from higher up in the hierarchy. Note that the level of the root logger cannot be inherited. If you set the level of a logger and later decide that it should inherit its level, then you need to specify “INHERITED” or synonymously “NULL” as the level value. The class attribute allows you to specify a custom level where the value of the attribute is the fully qualified name of a custom level class.
Addivity” – a very unlikely case but one that still must be taken into consideration. The additivity flag applies only to non-root loggers because a root logger, placed at the top of the hierarchy by construction, has no parent loggers. ObjectRenderers Object renderers, introduced on page 19, allow you to customize the way message objects of a given type are converted to string before being logged. This is done by specifying an ObjectRenderer for the object type would like to customize. The syntax for specifying object renderers is as follows.
Names can contain any character except the equal ‘=’ character. ” 34 CHAPTER 3: CONFIGURATION SCRIPTS ses any particular meaning in this context. The first step in configuring an appender is to specify its name and class: # Specify the appender name as well its class. class This has the effect of instantiating an appender of the specified class and set its name. The next step is to set the options of the appender. option2=value2 ... a. properties, of an appender are inferred dynamically using the well known JavaBeans paradigm.