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.html
[2]
https://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.qm...@minotaur.apache.org%3E
Jake
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