SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

Phenomenon: Failed to load class "org.slf4j.impl.StaticLoggerBinder"

In official FAQ: This error is reported when the org.slf4j.impl.StaticLoggerBinder class could not be loaded into memory. This happens when no appropriate SLF4J binding could be found on the class path. Placing one (and only one) of slf4j-nop.jar, slf4j-simple.jar,
slf4j-log4j12.jar, slf4j-jdk14.jar or logback-classic.jar on the class path should solve the problem.

My situation: I have log4j jar file on my classpath. Then, what reason cause this?

Analysis: The problem is in the POM.xml:

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.5</version>
<scope>test</scope>
</dependency>

Solution: remove the line <scope>test</scope>. Everything goes well.