Stack Overflow
Stack Overflow

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:

3285 questions
47
votes
6 answers

Even with slf4j, should you guard your logging?

Help me out in a debate here.. :) The slf4j site here http://www.slf4j.org/faq.html#logging_performance indicates that because of the parameterized logging, logging guards are not necessary. I.e. instead of writing: if(logger.isDebugEnabled()) { …
Mark D
  • 5,368
  • 3
  • 25
  • 32
47
votes
5 answers

Lambda support for SLF4J API

In Log4j latest API we have Lambda support where I can manage the Debug option easily. Example: logger.debug("This {} and {} with {} ", () -> this, () -> that, () -> compute()); But for slf4j/logback is there any option to have lambda enabled…
Souvik
  • 1,219
  • 3
  • 16
  • 38
47
votes
11 answers

Why calling LoggerFactory.getLogger(...) every time is not recommended?

I've read tons of posts and documents (on this site and elsewhere) pointing that the recommended pattern for SFL4J logging is: public class MyClass { final static Logger logger = LoggerFactory.getLogger(MyClass.class); public void…
danirod
  • 1,011
  • 3
  • 9
  • 18
46
votes
5 answers

Spring cache logging on @Cacheable hit

Currently I am working with a Spring Cache and the @Cacheable/@CacheEvict annotations. I would like to get some sort of a console log statement like "INFO: i got those values from the cache, NOT from the host. awesome" Is there a clean and easy way…
BassSultan
  • 574
  • 1
  • 5
  • 11
46
votes
7 answers

How do I configure Spring and SLF4J so that I can get logging?

I've got a maven & spring app that I want logging in. I'm keen to use SLF4J. I want to put all my config files into a directory {classpath}/config including log4j.xml and then init using a spring bean. e.g.
Programming Guy
  • 7,259
  • 11
  • 50
  • 59
43
votes
6 answers

slf4j + java.util.logging: how to configure?

I'm trying to use slf4j + java.util.logging. I know how to set up the Java source code to do this via logger = LoggerFactory.getLogger(...) and logger.warn('...') or whatever. But where's the documentation for setting up the configuration in slf4j?…
Jason S
  • 184,598
  • 164
  • 608
  • 970
41
votes
1 answer

How to map levels of java.util.logging and SLF4J logger?

How do logging levels from java.util.logging map to SLF4J? SLF4J trace debug info warn error fatal java.util.logging finest finer fine config info warning severe
shashantrika
  • 1,039
  • 1
  • 9
  • 29
40
votes
5 answers

Logback - set log file name programmatically

I am using logback, and I am trying to set the log file name programmatically within my Java program (similar to Setting Logback Appender path programmatically), and I tried to adapt that solution as follows: In logback-test.xml:
conorsomahony
  • 505
  • 1
  • 4
  • 7
40
votes
2 answers

How do I add a line break / blank line after my LOG statement?

I want to add a blank line after my LOG statement in order to make my logs more separated and readable. How do I do this? Current statement: LOGGER.info("Person's name is {} .", person.getName()); Note that I don't want to do this after every…
java123999
  • 6,974
  • 36
  • 77
  • 121
39
votes
3 answers

Difference between Simple Logging Facade for Java and Apache Commons Logging

What is the difference between Simple Logging Facade for Java and Apache Commons Logging?
Azder
  • 4,698
  • 7
  • 37
  • 57
39
votes
2 answers

Log4j 2.0 and SLF4J and the never ending future of java logging frameworks

So I just found out today that Log4J 2.0 is now actively being developed, there is an alpha version and it is said to replace logback. Right now in my app I have close to 4 maybe more logging frameworks: Java Util Logging log4j slf4j logback…
Adam Gent
  • 47,843
  • 23
  • 153
  • 203
37
votes
2 answers

Implement Custom Logger with slf4j

I want to implement a Custom logger which logs all log entries to a Database. Currently my app logs this way (slf4j and log4j binding): private static final Logger logger = LoggerFactory.getLogger( MyClass.class ); I'm not sure how to proceed. My…
Martin Dürrmeier
  • 1,653
  • 5
  • 18
  • 35
37
votes
4 answers

Building with Lombok's @Slf4j and Eclipse: Cannot find symbol log

I have the lombok plugin in Eclipse and enabled annotation processing in Eclipse under java compiler, but still it is unable to recognize the log statements when I use @Slf4j annotation. Do we have to make any other settings?
bashwin
  • 373
  • 1
  • 3
  • 5
37
votes
2 answers

Redirect System.out and System.err to slf4j

I needed to redirect System.out/err.println outputs to slf4j. I know that this is not the way to do logging properly but there is an external library, which logs to System.out.
itshorty
  • 1,522
  • 3
  • 17
  • 39
36
votes
10 answers

Spring Boot: multiple SLF4J bindings

I can't figure it out where a binding collision is. I have my Spring Boot 1.2.6.RELEASE service and I'm getting this error when I run it: SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in…
jscherman
  • 5,839
  • 14
  • 46
  • 88
1 2 3
…
99 100