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http://jira.qos.ch/browse/LBCLASSIC-58?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=10636#action_10636
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Diego Louzán commented on LBCLASSIC-58:
---------------------------------------
The debug attribute does not work because logback will fail to log status
errors when the xml file is ill-formed or when some appender fails due to
misconfiguration (this last statement about appenders is a generalization based
on DBAppender behaviour, it may be the case it's a DBAppender bug).
Suppose a configuration like this one:
<configuration debug="true">
[...]
<!-- DB appender -->
<appender name="DB"
class="ch.qos.logback.classic.db.DBAppender">
<connectionSource
class="ch.qos.logback.core.db.JNDIConnectionSource">
<param name="jndiLocation" value="java:comp/env/jdbc/test-ds"/>
</connectionSource>
[...]
</configuration>
In my case, running inside tomcat if the jndi location is wrong, logback will
silently fail without logging anything. That's why I had to add the
StatusPrinter call in the initialization of my app, just logging logback status
so I could trace configuration errors.
Besides that, I guess that "debug=true" will also enable other debug
statements, which I don't want in a production environment. It's just needed to
log logback state, not enabling debug status.
I've seen your last changes adding an event listener in a system property.
Maybe it would be interesting to enable the SYSOUT or SYSERR listener by
default? In my case, I would need to enable the listener by adding the system
property to tomcat initialization script, which is far from ideal. I guess it
will be the same in other scenarios, where you can't rely on having control of
the initialization script, thus making it difficult to set a system property
(j2ee containers for instance). I can't really tell a good solution to this
because my knowledge of logback architecture is limited.
> Print Logback own erros to System.out if debug is enabled?
> ----------------------------------------------------------
>
> Key: LBCLASSIC-58
> URL: http://jira.qos.ch/browse/LBCLASSIC-58
> Project: logback-classic
> Issue Type: Improvement
> Reporter: Anton Tagunov
> Assignee: Logback dev list
> Priority: Minor
>
> Hello Ceki, when debug is enabled lots of messages to to System.out anyway.
> Do you think it would be a good idea to also print messages going to
> StatusManager to System.out?
> Apparently there is huge demand for this feature.
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