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https://issues.apache.org/jira/browse/LOG4J2-905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17457201#comment-17457201
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Carter Kozak commented on LOG4J2-905:
-------------------------------------
The global switch was added in 2017 via
https://issues.apache.org/jira/browse/LOG4J2-2109 +
https://github.com/apache/logging-log4j2/pull/127
> Ability to disable (date) lookup completely, compatibility issues with other
> libraries like Camel
> -------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-905
> URL: https://issues.apache.org/jira/browse/LOG4J2-905
> Project: Log4j 2
> Issue Type: Improvement
> Components: Lookups
> Reporter: moritz löser
> Assignee: Gary D. Gregory
> Priority: Critical
> Labels: date, lookup
> Fix For: 2.7
>
>
> (see
> [here|http://stackoverflow.com/questions/27103400/log4j2-how-to-disable-date-lookup-log4j-throws-exception]
> for some details )
> At the moment it is not possible to log stuff like this:
> {noformat}
> log.info("${date:now:buhu}");
> {noformat}
> ("ERROR Invalid date format: "now:yyyyMMdd-HHmmss", using default
> java.lang.IllegalArgumentException: Illegal pattern character 'n'")
> Because log4j2 tries to change the logged output - want to substitute a date.
> This is intransparently limiting the logging.
> nobody knows what kind of strings are allowed and what kind of strings will
> be interpreted by log4j2. But it becomes worse if you use slf4j and switch
> the logger implementation to log4j2 - it could happen that just switching
> breaks your code.
> This is a *real issue* if you use libraries like *Apache Camel* because camel
> itself uses strings like {noformat}${date:now:YYYY...}{noformat} to
> substitute stuff like file names. see http://camel.apache.org/simple.html
> At the moment camel is logging this stuff on debug (sometime i need it to see
> if i correctly set up camel) so it is no production issue here. But what
> about other libraries or the future?
> The only way i see is a switch to disable all kinds of lookups and it should
> probably off by default.
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