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From Scott Deboy <scott.de...@gmail.com>
Subject Re: Log4j Extras ExpressionFilter issue
Date Tue, 02 Oct 2012 22:53:57 GMT
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 <hoju@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.html<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<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.qmail@**minotaur.apache.org%3E<http://mail-archives.apache.org/mod_mbox/logging-log4j-dev/200310.mbox/%3C20031027083531.85866.qmail@minotaur.apache.org%3E>
>
>
>
> Jake
>
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