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Questions tagged [slf4j]

Simple Logging Facade for Java (SLF4J) serves as a simple facade or abstraction layer for various logging frameworks. Please also include a tag for the actual logging framework you're using if you are attempting to configure logging for your application.

The Simple Logging Facade for Java (commonly known as "SLF4J") serves as a simple facade or abstraction layer for various logging frameworks, e.g. java.util.logging, log4j and logback.

One can unify all logging across an application and the libraries it uses via this abstraction layer. Code familiar with SLF4J uses the SLF4J API directly for logging. Any existing code or libraries that use some other logging framework can be bridged to get their logging redirected to SLF4J instead. The end application at deployment time includes a binding to the actual logging framework that they are using, and can configure that logging framework as desired for all logging throughout the application.

References:

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existence of the logging.properties file prevents logs from being written

I have an Spring Boot Web app that needs to use Java Util Logging behind SLF4J. When I don't create a logging.properties file, the Console Logger works just fine, and all INFO messages & above are logged. When I do create a logging.properties file,…
Mathew Alden
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How to write the trace level and one package with the debug level to a single file

I have log4j2 in my project and I want to configure logging as follows: First file: all trace level and one package with debug level. Second file: All logs of the debug level and higher (except for the package from the first point). I wrote two…
Violetta
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show debug level logs in console using slf4j without knowing logger implementation

I am using Lombok's @Slf4j annotation to get logger and log some data. I am NOT USING Spring boot application.yml. So, how can I show debug level logs in the console now? How should it be configured? Is there any way not to use…
Тигран Мартиросян
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How to programmatically look out for a specific log message from a particular class file in Java for Jboss application that uses slf4j/logstash?

I need to look out for specific log message from a particular class file in my JBoss application.It uses slf4j/logstash. Is there a way I can capture this programmatically(java)? Thanks
jayachsi
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SLF4J put and immediate get is failing

I've written a little wrapper for SLF4J MDC. import org.slf4j.MDC; import java.util.UUID; public final class MdcWrapperUtility { public static final String MDC_TRANSACTION_ID_KEY_NAME = "MDC_TRANSACTION_ID"; private…
granadaCoder
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Failed to instantiate SLF4J LoggerFactory when using slf4j with log4j2

I'm starting to use slf4j with log4j2 but I got the problem as below. What am I wrong or lack somethings of from the pom file? Failed to instantiate SLF4J LoggerFactory Reported exception: java.lang.NoClassDefFoundError:…
Nghia Tran
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Building with Cucumber v6 and Lombok's @Slf4j: Cannot find symbol log

After update from cucumber v 4.8.0 to 6.8.0, my project fails on build with error "java: cannot find symbol symbol: variable log" There is no error displayed in java class, annotation @Slf4j is used which is imported from…
Sergey Bykov
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how to log to googleads requests?

We've followed the advice given here: https://developers.google.com/google-ads/api/docs/client-libs/java/logging Neither of the proposed solutions have any visible effect on what is logged to the console, either in dev or in…
Marc
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Azure Functions: Configure Slf4j binding with Log4j2 and send logs to appinsights

I am using an Azure Function and I need to perform logging using slf4j binding with log4j2. I want my logs to get stored in application insights (Azure monitor). For this I have a log4j2.xml file for configuration, where I add the…
Vibhuti
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Spring Webflux with Log4j2

Quick question about the combination of Spring Webflux and Log4j2. For organizational reason, I must use Spring Webflux with log4j2. Our support team will even refuse to support the app if they cannot see a log4j2.xml in the project. Please, my…
PatPanda
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How to specify the path for storing logs in application.properties one level (or same level) above the project directory

I have specified in logback.xml the dependency on the Spring logger: logging.file.path=logs logging.file.name=${logging.file.path}/app.log And now, when writing logs, a logs folder is created in the root folder of the project and for some reason…
SorryForAsking
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How to add slf4j marker in quarkus application logs

Using quarkus version 1.5.2.Final LoggerFactory.getLogger("test").info(MarkerFactory.getMarker("TEST_MARKER"),"log statement"); This gets logged as : 2020-09-12 21:08:08,282 INFO [test] (executor-thread-1) log statement I would also like to…
Krittam Kothari
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How to log logs with different log levels to different files in Dropwizard?

So Basically what I want to do is to log logs with different logs levels like INFO DEBUG WARN etc to different log files. I have found something similar for slf4j here but dropwizard uses logback as logging framework. Can anybody tell me how to do…
Aditya Verma
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Sl4j logger does not log when it used in conjunction with ResponseEntityExceptionHandler for catching exceptions

I have used @ControllerAdvice to create a catch-all exception handler to catch all exceptions and log accordingly. However, for some reason, the sl4j logger fails to log to console. The same logger works every other place in my application but it…
Ali
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Logback-classic conflict with SLF4J through different dependencies

I have an internal library that was upgrade to use logstash which has a mandatory dependency to logback, hence logback-classic (which has its own slf4j appender internally of its packages, which means I can't exclude any library here). When I try to…
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