Try PROP.url == 'blah'
MDC entries are really just set as properties of the log4j events.
Scott
On Tue, Oct 2, 2012 at 1:10 PM, Jacob Kjome h...@visi.com wrote:
I'm trying to use the ExpressionFilter [1] from Log4j Extras to limit
logging for a particular appender to those cases where MDC contains a url
entry that equals some specific value. But I get an error from Log4j
saying Invalid EQUALS rule - MDC.url is not a supported field (see below
for complete error output from Log4j). I'm using the latest versions of
Log4j-1.x and Log4j-extras. Here's the relevant config...
appender...
filter class=org.apache.log4j.**filter.ExpressionFilter
param name=Expression value=MDC.url == '
http://somedomain/somepath'/**
/filter
/appender
Based on the documentation [2] and commit comment [3] I found, it seems
like this should work. What am I missing?
Here's the complete error output from Log4j...
log4j:ERROR Could not create an Appender. Reported error follows.
java.lang.**IllegalArgumentException: Invalid EQUALS rule - MDC.url is
not a supported field
at org.apache.log4j.rule.**EqualsRule.init(EqualsRule.**java:62)
at org.apache.log4j.rule.**EqualsRule.getRule(EqualsRule.**
java:100)
at org.apache.log4j.rule.**EqualsRule.getRule(EqualsRule.**
java:85)
at org.apache.log4j.rule.**RuleFactory.getRule(**
RuleFactory.java:154)
at org.apache.log4j.rule.**ExpressionRule$**
PostFixExpressionCompiler.**compileExpression(**ExpressionRule.java:149)
at org.apache.log4j.rule.**ExpressionRule.getRule(**
ExpressionRule.java:100)
at org.apache.log4j.filter.**ExpressionFilter.**activateOptions(**
ExpressionFilter.java:95)
at org.apache.log4j.config.**PropertySetter.activate(**
PropertySetter.java:307)
at org.apache.log4j.xml.**DOMConfigurator.parseFilters(**
DOMConfigurator.java:380)
at org.apache.log4j.xml.**DOMConfigurator.parseAppender(**
DOMConfigurator.java:273)
at org.apache.log4j.xml.**DOMConfigurator.**findAppenderByName(**
DOMConfigurator.java:176)
at org.apache.log4j.xml.**DOMConfigurator.**
findAppenderByReference(**DOMConfigurator.java:191)
at org.apache.log4j.xml.**DOMConfigurator.**
parseChildrenOfLoggerElement(**DOMConfigurator.java:523)
at org.apache.log4j.xml.**DOMConfigurator.parseRoot(**
DOMConfigurator.java:492)
at org.apache.log4j.xml.**DOMConfigurator.parse(**
DOMConfigurator.java:1006)
at org.apache.log4j.xml.**DOMConfigurator.doConfigure(**
DOMConfigurator.java:872)
at org.apache.log4j.xml.**DOMConfigurator.doConfigure(**
DOMConfigurator.java:778)
at org.apache.log4j.helpers.**OptionConverter.**
selectAndConfigure(**OptionConverter.java:526)
at org.apache.log4j.LogManager.**clinit(LogManager.java:127)
at org.slf4j.impl.**Log4jLoggerFactory.getLogger(**
Log4jLoggerFactory.java:64)
at org.slf4j.LoggerFactory.**getLogger(LoggerFactory.java:**270)
at org.slf4j.LoggerFactory.**getLogger(LoggerFactory.java:**281)
[1] http://logging.apache.org/**log4j/companions/extras/**
apidocs/org/apache/log4j/**filter/ExpressionFilter.htmlhttp://logging.apache.org/log4j/companions/extras/apidocs/org/apache/log4j/filter/ExpressionFilter.html
[2] https://logging.apache.org/**log4j/companions/extras/**
apidocs/org/apache/log4j/spi/**LoggingEventFieldResolver.htmlhttps://logging.apache.org/log4j/companions/extras/apidocs/org/apache/log4j/spi/LoggingEventFieldResolver.html
[3] http://mail-archives.apache.**org/mod_mbox/logging-log4j-**
dev/200310.mbox/%**3C20031027083531.85866.qmail@**minotaur.apache.org%3Ehttp://mail-archives.apache.org/mod_mbox/logging-log4j-dev/200310.mbox/%3c20031027083531.85866.qm...@minotaur.apache.org%3E
Jake
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