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

[Debraj Manna]

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> 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>>
>> 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>
>>
>>
>> Cross-posting from stackoverflow <https://stackoverflow.com/que
>> stions/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>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";}}publicclassServiceext
>> endsApplication<Conf>{publicstaticfinalLoggerlogger
>> =LoggerFactory.getLogger(Service.class);publicstaticvoidmain
>> (Stringargs[]){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));configura
>> tor.setContext(loggerContext);configurator.doConfigure(configStream);//
>> loads logback fileconfigStream.close();System.out.println("Loaded
>> configuration file");}catch(JoranException|I
>> OExceptione){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> 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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