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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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Is SLF4J thread-safe?

I might have a Dog class that has a single instance shared across multiple threads. I plan on using SLF4J for all logging: public class Dog { private Logger logger = LoggerFactory.getLogger(Dog.class); // ...etc. } Is my logger instance…
user1768830
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What's the overhead of creating a SLF4J loggers in static vs. non-static contexts?

I've always used the following pattern to construct (SLF4J) loggers: private static final Logger log = LoggerFactory.getLogger(MyClass.class); This has worked so far, but I was wondering about the static context at some point and the need to pass…
Kawu
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NoSuchMethodError with SLF4J API

When Use with slf4j, String test = blahblahblah; logger.info("{}",test); Trace as below java.lang.NoSuchMethodError: org.slf4j.helpers.MessageFormatter.format(Ljava/lang/String;Ljava/lang/Object;)Lorg/slf4j/helpers/FormattingTuple; at…
user496949
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SLF4J - Logback: How to configure loggers in runtime?

we are using LogBack with our project, I want to configure logger according to some Data Base values, i.e If some DB value is set to true, then logger should use both file and DB appenders, if it's false so logger must use only DB appender, I also…
Amr Faisal
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Error scanning entry "module-info.class" when starting Jetty server

I'm seeing this recently when I start my java server. Has anyone else seen this? If so whats the fix? I can confirm the jar's and the module-info.class are present in the relevant paths. MultiException[java.lang.RuntimeException: Error scanning…
Puliyur ranganath
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Failed to load class "org.slf4j.impl.StaticLoggerBinder" message error from SLF4J

I am developing a simple server using Akka and Akka-http. I always get following error message in stdout when I run application into IntelliJ: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP)…
Sergio Rodríguez Calvo
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spark-submit, how to specify log4j.properties

In spark-submit, how to specify log4j.properties ? Here is my script. I have tried all of combinations and even just use one local node. but looks like the log4j.properties is not loaded, all debug level info was dumped. …
user1615666
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How to make Jersey to use SLF4J instead of JUL?

I've found a useful article that explains how to make Jersey to use SLF4J instead of JUL. Now my unit test looks like (and it works perfectly): public class FooTest extends JerseyTest { @BeforeClass public static void initLogger() { …
yegor256
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Akka SLF4J logback configuration and usage

I have done the following steps to try and configure logging for my akka application: created an application.conf file and placed it in src/main/resources. It looks like: akka { event-handlers = ["akka.event.slf4j.Slf4jEventHandler"]…
Apple Pie
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How to dynamically change log level in SLF4j OR Log4J

Recently I encountered a situation where Application Loglevel changes dynamically. Application Admin can set it to INFO/DEBUG/ WARN from front end. Based on the log level choosen be him application logging must be changed. I am sure loggers support…
Narendra
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multiple SLF4J bindings Error with activemq-all-5.6.0.jar

When I upgrade to activemq-all-5.6.0 I get this error during server startup SLF4J: Class path contains multiple SLF4J bindings I don't have this issue when using activemq-all-5.5.1 On checking I do find that there StaticLoggerBinder.class in both…
Jeenson Ephraim
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Logging in Clojure

For Java development, I use Slf4j and Logback. Logger logger = LoggerFactory.getLogger(HelloWorld.class); logger.debug("Hello world."); How to use these two libs in Clojure programs? Majority of Clojure programming doesn't has .class concept…
Chiron
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Solr: how to turn down logging

OK, so I'm thrilled with Solr, but I can't seem to figure out how to turn down the logging level so that it will actually run acceptably fast when I do a huge import run. I'm not even sure which logging framework it's using (because, you know,…
George Armhold
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Make logback pattern part optional?

Is it possible to make parts of logbacks pattern layout depending on an attribute? e.g. show bdid (...) just in the case when %X{bdid} exists? This appender …
Stefan K.
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Dynamically add appender with slf4j and log4j2

I want to dynamically create an appender and add it to a logger. However, this seems not to be possible with slf4j. I can add my appender to a log4j logger but then I fail to retrieve the logger with the slf4j LoggerFactoy. What I want to do: I…
Daniele Torino
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