How to log repeated warnings only once

Question

There is a pattern that happens every now and then. I have a method called many times, and it contains this snippet:

Foo foo = getConfiguredFoo();
if (foo == nu         


        

Answer 1

I faced a similar problem sometime ago but could not find any way of dealing with this in Log4J. I finally did the following:

Foo foo = getConfiguredFoo();
if (foo == null) {
  if(!warningLogged)logger.warn("Foo not configured");
  warningLogged = true
  foo = getDefaultFoo();
}

This solution is OK if you have one or two log statements you don't want to see repeated in your logs but does not scale up with more log statements (you need a boolean for every message logged)