How to find which library slf4j has bound itself to?
JavaLoggingLog4jSlf4jJava Problem Overview
I am using slf4j for logging in my application. I get the purpose of slf4j. I would like to know how to find out which logging-library slf4j is currently binding to. I have log4j in my referenced libraries. I am assuming that slf4j has bound itself to log4j.
What I would like to know is, is there any way to explicitly confirm this binding?
Java Solutions
Solution 1 - Java
Just do what SLF4J does to discover the binding:
final StaticLoggerBinder binder = StaticLoggerBinder.getSingleton();
Now you can try to find out what is the actual implementation [tag:logback] in my case:
System.out.println(binder.getLoggerFactory());
System.out.println(binder.getLoggerFactoryClassStr());
This prints:
ch.qos.logback.classic.LoggerContext[default]
ch.qos.logback.classic.selector.DefaultContextSelector
Solution 2 - Java
The StaticLoggerBinder's getLoggerFactoryClassStr() method is probably what you're looking for.
Solution 3 - Java
Easy. Put a breakpoint on .. say.. LOG.info(...). Once debugger stops there, step into.. and viola.. you will find yourself in the code of the actual logger... say log4j or logback.. whatever.
Solution 4 - Java
It's possible to do this using the main slf4j public API (i.e. without the internal StaticLoggerBinder), e.g. to detect if slf4j has bpound to log4j2:
if ("org.apache.logging.slf4j.Log4jLoggerFactory".equals(
org.slf4j.LoggerFactory.getILoggerFactory().getClass().getName()
)
{ ... }