Thanks Scott,
However, while I didn't experience an error in parsing the expression this
time, the expression seems to be, at least partially, ignored.
Below is the relevant config, where com.mypackage.MyClass sets MDC (via SLF4J)
with a "url" key and the currently processed URL as the value, then logs the
page content for the URL at the TRACE level (with MDC removal of "url"
immediately after logging the page content). But rather than getting TRACE
output for only the URL defined in the Expression, I get **all** TRACE
output. It's like it sees the "LEVEL == TRACE" but then ignores the "&&".
Thoughts?
<appender name="default"
class="org.apache.log4j.rolling.RollingFileAppender">
...
<filter class="org.apache.log4j.filter.ExpressionFilter">
<param name="Expression"
value="( LEVEL >= DEBUG ) || ( LEVEL == TRACE &&
PROP.url ==
'https://somedomain/somepath/somepage.do?someparam=someval&anotherparam=anotherval'
)"/>
</filter>
</appender>
<logger name="com.mypackage.MyClass">
<level value="TRACE"/>
</logger>
<root>
<level value="WARN"/>
<appender-ref ref="default"/>
</root>
On Tue, 2 Oct 2012 15:53:57 -0700
Scott Deboy <scott.de...@gmail.com> wrote:
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.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.qm...@minotaur.apache.org%3E>
Jake
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