[logback-dev] [JIRA] Created: (LBCORE-209) Print configuration errors to stderr

[atomicknight (JIRA)]

Print configuration errors to stderr
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                 Key: LBCORE-209
                 URL: http://jira.qos.ch/browse/LBCORE-209
             Project: logback-core
          Issue Type: Improvement
          Components: Other
    Affects Versions: 0.9.28
            Reporter: atomicknight
            Assignee: Logback dev list


In org.slf4j.impl.StaticLoggerBinder#init(), any detected configuration errors are passed to StatusPrinter to be printed. However, the default PrintStream used by StatusPrinter is stdout, which can interfere with the output of command-line based Java programs that are used in the same fashion as applications such as ls or grep.

Would it be possible to modify this behavior such that configuration errors are printed to stderr instead? A potential solution would be to overload StatusPrinter#printInCaseofErrorsOrWarning and StatusPrinter#printIfErrorsOccurred with versions that also take a PrintStream as an argument - this would allow classes like StaticLoggerBinder to specify the appropriate output stream without overriding the global state in StatusPrinter. Alternatively, an additional setting in the XML configuration might work just as well.

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