How do I fix SLF4J class path contains multiple SLF4J bindings?

Using maven run mvn dependency:tree and figure out the maven dependency and exclude log4j with snippet below to that dependency in your pom. xml . This should resolve SLF4J: Class Path Contains Multiple SLF4J Bindings.

What are SLF4J bindings?

Bindings are basically implementations of a particular SLF4J class meant to be extended to plug in a specific logging framework. By design, SLF4J will only bind with one logging framework at a time. Consequently, if more than one binding is present on the classpath, it will emit a warning.

How does SLF4J binding work?

When a library declares a compile-time dependency on a SLF4J binding, it imposes that binding on the end-user, thus negating SLF4J’s purpose. The implementation is not bound at compile-time (it’s not a static/early binding) or in other words the implementation it’s not known at compile time.

What is SLF4J API?

Simple Logging Facade for Java (abbreviated SLF4J) – acts as a facade for different logging frameworks (e.g. java. util. logging, logback, Log4j). It offers a generic API making the logging independent of the actual implementation. This allows for different logging frameworks to coexist.

What is log4j over SLF4J?

log4j-over-slf4j. SLF4J ship with a module called log4j-over-slf4j. It allows log4j users to migrate existing applications to SLF4J without changing a single line of code but simply by replacing the log4j.

Why do we use SLF4J?

This is the main purpose of SLF4J (Simple Logging Facade for Java) – a logging abstraction which helps to decouple your application from the underlying logger by allowing it to be plugged in – at runtime. Of course, the flexibility that such an abstraction provides is the main reason to use SLF4J.

Is SLF4J logger thread safe?

util. logging. Logger is thread-safe (search for “multi-thread safe”)

Can we use Log4j and SLF4J together?

So essentially, SLF4J does not replace log4j; they both work together. It removes the dependency on log4j from your application and makes it easy to replace it in the future with the more capable library.

Can we use log4j and SLF4J together?

Can we use SLF4J instead of log4j?

In future, if you want to replace log4j with any other logging framework – All you have to do is replace the binding and logging jar files (along with configuration file). It’s easy. No need to change the actual source code files. So essentially, SLF4J does not replace log4j, they work together.

Which is better log4j or SLF4J?

Unlike log4j, SLF4J (Simple Logging Facade for Java) is not an implementation of logging framework, it is an abstraction for all those logging frameworks in Java similar to log4J. Therefore, you cannot compare both. If you have a choice, logging abstraction is always preferable than logging framework.

Should I use log4j or SLF4J?

Using SLF4J means that replacing the implementation is very easy if company policy changes, e.g. when your company is acquired and new policies forced on you. Using SLF4J now, when you write the code, will take no more time than using Log4j directly. Replacing direct Log4j calls later will take a lot of time.

Is there a class path containing multiple SLF4J bindings?

First, let’s look at a sample warning: ? SLF4J: Class path contains multiple SLF4J bindings. SLF4J: See http://www.slf4j.org/codes.html #multiple_bindings for an explanation. This warning is telling us that SLF4J has found two bindings. One is in slf4j-log4j12-1.7.21.jar and the other in logback-classic-1.1.7.jar.

Are there any SLF4J bindings in Logback classic?

This warning is telling us that SLF4J has found two bindings. One is in slf4j-log4j12-1.7.21.jar and the other in logback-classic-1.1.7.jar. Now, let’s understand why we see this warning. The Simple Logging Facade for Java (SLF4J) serves as a simple facade or abstraction for various logging frameworks.

How to find conflicting jars in SLF4J class path?

As can be seen on the last line of the warning, SLF4J has chosen Log4j by using org.slf4j.impl.Log4jLoggerFactory for the actual binding. 3. Finding the Conflicting JARs

Why does SLF4J emit warning when there is more than one binding?

Bindings are basically implementations of a particular SLF4J class meant to be extended to plug in a specific logging framework. By design, SLF4J will only bind with one logging framework at a time. Consequently, if more than one binding is present on the classpath, it will emit a warning.

https://www.youtube.com/watch?v=tacyRereiQI