Why do we declare Loggers static final?

Question

In Java, why is it best practice to declare a logger static final?

private static final Logger S_LOGGER

Answer 1

In addition to the reasons given in the other answers one thing I ran into was that if my logger was neither static nor final:

...
public Logger logger = LoggerFactory.getLogger(DataSummary.class);

public String toJson() {
  GsonBuilder gsonBuilder = new GsonBuilder();   
  return gsonBuilder.create().toJsonTree(this).toString();
}
...

in certain cases (when I was using the Gson library) I would get stackoverflow exception. My specific situation was to instantiate the class containing the non static non final logger. Then call the toJson method which invoked GsonBuilder:

...
DataSummary ds = new DataSummary(data);    
System.out.println(ds.toJson());
...