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http://jira.qos.ch/browse/LBCLASSIC-260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12422#action_12422
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Ceki Gulcu commented on LBCLASSIC-260:
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Thank you for yet another great idea and associated implementation.
Looking at RecordingAppender, I see that you are using ThreadLocal variables
which allow the appender to dump events per thread.
Are you aware LBCLASSIC-183 ? If my memory serves me correctly, Tomcat dislikes
ThreadLocal classes, such as the
ch.qos.logback.classic.util.CopyOnInheritThreadLocal class, when loaded by the
web-app class loader. I am unsure if this restriction applies to values whose
class is loaded by the web-app class loader. In other words, it is possible
that using ch.qos.logback.core.helpers.CyclicBuffer, the value type for the
ThreadLocal in RecordingAppender, might be problematic in Tomcat. Redeploying
an application which uses RecordingAppender in Tomcat should tell us whether
LBCLASSIC-183 applies.
> Recording appender that dumps debug messages only when error occurs
> -------------------------------------------------------------------
>
> Key: LBCLASSIC-260
> URL: http://jira.qos.ch/browse/LBCLASSIC-260
> Project: logback-classic
> Issue Type: New Feature
> Components: appender
> Affects Versions: 0.9.28
> Reporter: Tomasz Nurkiewicz
> Assignee: Logback dev list
>
> Provide built-in utility appender that silently stores last few logging
> messages and dumps them (forwards to a target appender) only when an error
> occurs. Older logging events are replaced with new ones. This is a
> configuration example:
> <configuration>
> <appender name="REC" class="ch.qos.logback.classic.RecordingAppender">
> <appender-ref ref="STDOUT"/>
> <maxEvents>1000</maxEvents>
> <dumpThreshold>WARN</dumpThreshold>
> <expiryTimeMs>15000</expiryTimeMs>
> </appender>
> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
> <encoder>
> <pattern>%-4relative [%thread] %-5level - %msg%n</pattern>
> </encoder>
> </appender>
> <root level="DEBUG">
> <appender-ref ref="REC"/>
> </root>
> </configuration>
> Such an appender is crafted manually by several users, it would be nice to
> provide it out of the box. I already implemented this feature (100% test
> coverage):
> https://github.com/nurkiewicz/logback/tree/recording-appender
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