anchor.diff:  
   Now, Spring can resolve the dependency but that slf4j implementation of JCL's api is actually an API itself. So we need to place the implementation into the classpath.
   
  -Step 3. Add the log4j and log4j-slf4j bridge into the project.
  +== Step 3. Add the log4j and log4j-slf4j bridge into the project.
   
   build.gradle
   [source,groovy]
  
positive.code: ----
  Now, the slf4j can find the implmenetaion "org.slf4j.impl.StaticLoggerBinder" in log4j-slf4j-impl, which in turns use log4j-core.
  
  
  
  
  
negative.code: 
  Official Reference: https://docs.spring.io/spring/docs/current/spring-framework-reference/html/overview.html#overview-logging
  
  == Step 1. First, tell dependency manager not to use Jakarta Commons Logging (JCL) by adding:
  
  .build.gradle
  [source,groovy]
  