Fix Log4j Debug Warning Issue

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In this guide, we will find out some possible reasons that might cause the log4j debug warning and after that, we will provide some possible fixes that you can try to solve this problem.

// Usually this “verbose” creates the level if it doesn’t already exist.Last step VERBOSE = Level.forName(“VERBOSE”, 550);logger final logger = LogManager.getLogger();logger.log “a (verbose, verbose message”); // Even use custom VERBOSE level// Create a custom pass “DIAG” and go to the new level.logger.log(Level.forName(“DIAG”, 350), message”);// “analytical Use (do not create) some custom layer “DIAG”.// *after* your own level create has become!logger.log(Level.getLevel(“DIAG”), “another analytical message”);// Using an undefined level will result in errors: Level 1.getLevel() returns null,// and logger.log(null, “message”) throws an exception.logger.log(Level.getLevel(“FORGOT_TO_DEFINE”), “message”); // Throw an exception! level=”trace”> Ref=”My file” // Handy solutions for built-in DEBUG leveldebug(tag, message)debug (marker, message, one-shot)debug(tag, (tag, object)debug object, one-time)debug(tag, string)debug(tag, string, object… (tag, )debug chain, disposable)debug(message)one-time debugging)Debug(message, (string, (string)debugging one-time)debug(object)debug(object, object…)debug (page(ka, one-time support adding)// lambda 2 methods in.4debug(marker, (marker, MessageSupplier)debug Provider messagesupplier, Throwable)debug(tag, line, …)debug(tag, provider)debug(Token, Vendor, Disposable)debug(string, one-shot)provider (debug provider(ProviderMessage, messages)debug…)debug(Provider)debug (provider, one-time)// you need to pass the changed level in the parameterlogger as.log(VERBOSE, “verbose message”);logger.log(Level.forName(“DIAG”, 350), “other message”);// have: nice verbose methods and no need for thread-level parameterslogger as.verbose(“verbose message”);logger.diag(“another message”);logger.lambda expression diag(“important”, Java: () -> someMethod());// ExtLogger generated loggerimport wrapper com.mycompany.myproject.ExtLogger;open MyService class // and surprisingly instead of logger = logger LogManager.getLogger(MyService.class): private static logger final ExtLogger = ExtLogger.create(MyService.class); . . . .void .general .population .demoExtendedLogger() . . . . . . . .// …. Logger .trace(“TRACE level”); built-in logger.level: verbose(“one one message setup”); verbose logger.Debug(“alllevel “swarmed DEBUG”); logger.notice(“User level: message”); note logger.info(“Integrated layer”); info logger.diag(“User level message”); diagnostics : logger.warn(“built-in .level .WARN”); . . . . . . .Recorder ..Built-in (error level “ERROR”); logger.fatal(“FATAL LEVEL”); built-in logger.notice(“Java 8 Tower Lambda will fire NOTICE only if allowed: “, () SomeMethod()); -> // … …java -cp log4j-core-2.17.2.jar org.apache.logging.log4j.core.tools.n extended log generator Com.mycomp.DIAG=350 extlogger NOTICE=450 > com/mycomp/ExtLogger verbose=550.javajava -cp log4j-core-2.17.2.jar org.apache.logging.log4j.core.tools.n customloggergenerator com.mycomp.MyLogger DEFCON2=450 defcon1=350 > defcon3=550 com/mycomp/MyLogger.java

Learn more about log4j logging levels in this log4j2 tutorial. Log levels apply restrictions on the amount and type of information provided in logging instructions.

Many analyzers like Splunk can be used to prepare experiments based on the log filter level.

1. Logging Levels

In log4j, within log levels are instances of org class.apache.log4j.Level. Log4j has the following logging thresholds la.Readabilitydatatable=”1″>

Log

Description

Integer value

ALL

ALL is used to include all entry levels. Once configured, not all other levels can be taken into account, including specially created levels.

Integer.MAX_VALUE

>

trace

trace was introduced in version 1.2 and adds even more information about debug datasets. At this level, the amount of firewood generated can be huge, so be careful.

600

< td>

DEBUG

DEBUG is used to log those specific academic events that are most useful for debugging applications.
This level is the reverse of the production environment. , this is necessary if you want to be able to debug critical production issues that your development environment cannot reproduce.

500

< tr>

INFORMATION

INFORMATION is the most commonly used information in production log messages, highlighting the progress of an application down to a detailed level.
System administratorsNistrators monitor my information logs in real time to see what’s going on in the system, and when there is a problem, the system runs Ng normally.

400

WARNING

WARNING continue to suggest the application can, but we must be careful. Generally, applications can use warnings, but they should always be validated properly.

300

< roars tr >

reports

ERROR

ERROR to us that a particular product has experienced a terrible failure and we are required to investigate immediately. simply This means that the application has reached a really undesired state. For example, database or port unavailability, unexpected and formatting, etc. Signals

200

< p>fatal

< p>Fatal ERRORS are very bad news, some even crash the application.

100

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tr>

OFF

Pretty simple. WITHOUT REGISTRATION!!

Note that Log4j assigns a specific root case level by defaultTorah. ERROR.

2. Set Logging Levels

2.1. Level Logging Settings In Log4j2.properties

Due to the DEBUG of the example, logging is configured for the root cause logger, with the exception of the “com.howtodoinjava.web.controller” package, which generates Log logs.INFO.

rootLogger.level=debugappender.console.type=Consoleappender.console.name is equal to consoleLoggerappender.console.layout.type=Sample Layoutappender.console.layout.pattern = %dyyyy-MM-dd HH:mm:ss %-5p %c1:%l - %m%n# log info messages order them from 'com package.howtodoinjava.web.controller'logger.com.howtodoinjava.web.controller=INFO, consoleLogger

2.2. Parameter Level Logging With Log4j2.xml