[slf4j-user] Fwd: SLF4J Warning - Loggers will not work as they were created during initialization phase

[Ceki]

If you are going to update, go for the latest.

On 16.01.2018 05:13, Debraj Manna wrote:
> Thanks Ceki.
> 
> Ok I am using slf4j-api 1.7.5. Even after initialization I am not seeing 
> the logging events being logged while using that logger. I will update 
> to the slf4j 1.7.15 and post back with the results.
> 
> On Tue, Jan 16, 2018 at 2:51 AM, Ceki <ceki at qos.ch <mailto:ceki at qos.ch>> 
> wrote:
> 
> 
>     As of SLF4J 1.7.15, slf4j-api stores and replays events that were
>     created during the initialization phase. In previous versions, these
>     events were lost. However, logging events occurring after
>     initialization should work fine in all versions.
> 
>     I suggest upgrading slf4j-api to 1.7.25.
> 
>     On 15.01.2018 20:14, Debraj Manna wrote:
> 
> 
>         ---------- Forwarded message ----------
>         From: *Debraj Manna* <subharaj.manna at gmail.com
>         <mailto:subharaj.manna at gmail.com>
>         <mailto:subharaj.manna at gmail.com <mailto:subharaj.manna at gmail.com>>>
>         Date: Tue, Jan 16, 2018 at 12:30 AM
>         Subject: SLF4J Warning - Loggers will not work as they were
>         created during initialization phase
>         To: slf4j-user at qos.ch <mailto:slf4j-user at qos.ch>
>         <mailto:slf4j-user at qos.ch <mailto:slf4j-user at qos.ch>>
> 
> 
>         Cross-posting from stackoverflow
>         <https://stackoverflow.com/questions/48268724/slf4j-warning-loggers-will-not-work-as-they-were-created-during-initialization
>         <https://stackoverflow.com/questions/48268724/slf4j-warning-loggers-will-not-work-as-they-were-created-during-initialization>>
> 
>         I am using slf4j with logback in a dropwizard application.
>         During the application initialization I am seeing logs like below
> 
>         |SLF4J:Thefollowing loggers will not work because they were
>         created SLF4J:during the defaultconfiguration phase of the
>         underlying logging system.SLF4J:Seealso
>         http://www.slf4j.org/codes.html#substituteLogger
>         <http://www.slf4j.org/codes.html#substituteLogger>
>         <http://www.slf4j.org/codes.html#substituteLogger
>         <http://www.slf4j.org/codes.html#substituteLogger>>SLF4J:com.vnera.healthandmetrics.VneraMetrics|
> 
>         I am using |logback.xml| with my dropwizard application. My code
>         flow looks like below
> 
>         |publicclassVneraMetrics{privatestaticfinalLoggerlogger
>         =LoggerFactory.getLogger(VneraMetrics.class);...// This method
>         is getting called from Service.run() during the dropwizard
>         application initializationpublicStringgetSomeValue(){// logger
>         is not accessed from this functionreturn"Some initialized
>         value";}}publicclassServiceextendsApplication<Conf>{publicstaticfinalLoggerlogger
>         =LoggerFactory.getLogger(Service.class);publicstaticvoidmain(Stringargs[]){logger.info
>         <http://logger.info>("Some logs");Serviceservice
>         =newService();service.run(dropWizardArgs);Utils.reloadLogger();}}|
> 
>         |Utils.reloadLogger()| is loading the loggback configuration as
>         discussed here
> 
>         |publicstaticvoidreloadLogger(){StringloggingConfig
>         =System.getProperty("logback.configurationFile");if(loggingConfig ==null){System.out.println("Logging
>         Config is null");}LoggerContextloggerContext
>         =(LoggerContext)LoggerFactory.getILoggerFactory();loggerContext.reset();JoranConfiguratorconfigurator
>         =newJoranConfigurator();try{InputStreamconfigStream
>         =FileUtils.openInputStream(newFile(loggingConfig));configurator.setContext(loggerContext);configurator.doConfigure(configStream);//
>         loads logback
>         fileconfigStream.close();System.out.println("Loaded
>         configuration
>         file");}catch(JoranException|IOExceptione){e.printStackTrace();System.out.println("Failed
>         to log configuration file");System.exit(1);}}}|
> 
>         *Versions*
> 
>            * Logback - 1.2.3
>            * Dropwizard - 1.0.2
> 
>         Can some one let me know what does the SLF4J warning denotes? I
>         have seen the substituteLogger
>         <http://www.slf4j.org/codes.html#substituteLogger
>         <http://www.slf4j.org/codes.html#substituteLogger>> page but
>         this does not mention how can I get around this? On trying to
>         use logger in |VneraMetrics| it is not printing anything.
> 
> 
> 
> 
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