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http://jira.qos.ch/browse/LBCLASSIC-265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12016#action_12016
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Ralph Goers commented on LBCLASSIC-265:
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The biggest consequence is that there is one extra level of indirection between
the logger and the log level and filters. I tried every way I could think of to
squeeze that and was surprised at how fickle the JVM appears to be. What I
ended up with is extremely close to Logback's performance when calling
isDebugEnabled a million times when the result is false.
The second impact is what happens when you programmatically try to add a filter
or appender to a logger. This is handled differently than processing a new
configuration. In this case each change is done using thread-safe mechanisms
since each change is done one at a time. I'm not going to go into the details,
but this can get complicated. However, like SLF4J, the public API doesn't
contain methods to do any of those operations.
> Logging stops if invalid xml configuration is loaded by scanner
> ---------------------------------------------------------------
>
> Key: LBCLASSIC-265
> URL: http://jira.qos.ch/browse/LBCLASSIC-265
> Project: logback-classic
> Issue Type: Bug
> Affects Versions: 0.9.28
> Reporter: Iwein Fuld
> Assignee: Logback dev list
>
> When logging with scan="true" it is possible to stop all logging of an
> application silently.
> Steps to reproduce:
> - start an application with valid configuration and scan=true
> - break the logback.xml (leave out a quote or something)
> -> log goes silent
> Expected behavior:
> Logger fails to load new config and keeps running on the old configuration
> (like when valid xml, but invalid configuration is loaded).
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