[logback-dev] [JIRA] (LOGBACK-902) Provide a way to set System.out and System.err used by logback

Thu, 26 Sep 2013 07:11:40 -0700

Gael Lalire commented on New Feature LOGBACK-902

Hello, I didn't know this project. After checking, I dislike the way it intercept (ie print but not write).
I already write an interception code (on write) and it is working without limitation.

However I have to use reflection and reload logback (+- 200ms), the method I ask is just a way to improve performance and maintenance.

            Field streamField = ConsoleTarget.class.getDeclaredField("stream");
            streamField.setAccessible(true);
            streamField.set(ConsoleTarget.SystemOut, System.out);
            streamField.set(ConsoleTarget.SystemErr, System.err);
            streamField.setAccessible(false);

            LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
            ContextInitializer ci = new ContextInitializer(loggerContext);
            URL url = "" class="code-keyword">true);
            try {
                JoranConfigurator configurator = new JoranConfigurator();
                configurator.setContext(loggerContext);
                loggerContext.reset();
                configurator.doConfigure(url);
            } catch (JoranException je) {
                // StatusPrinter will handle this
            }
            StatusPrinter.printInCaseOfErrorsOrWarnings(loggerContext);

I think about another clean solution if logback provides a way to install a hook just after slf4j call, so I can set a thread local.
I also think about checking the stack and looking for a subclass of slf4j logger however Reflection.caller will be removed and it is not a performant solution.
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