Java Driver - Logging - How?

I am having trouble getting logging to work.
For all I understand I have to place the SLF4J-API and, in my case JUL binding SLF4J-JDK14, into my pom.xml…

<dependency> 
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-jdk14</artifactId>
  <version>1.7.30</version>
</dependency>  
<dependency> 
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <version>1.7.30</version>
</dependency>

… and set these system properties:

System.setProperty("DEBUG.MONGO", "true");
System.setProperty("DB.TRACE", "true");

But unfortunately I do not see any log messages from mongo at all.

Can someone point me in the right direction?