1 package ch.qos.logback.core.pattern; 2 3 import ch.qos.logback.core.pattern.DynamicConverter; 4 5 public class ExceptionalConverter extends DynamicConverter { 6 7 public String convert(Object event) { 8 if(!isStarted()) { 9 throw new IllegalStateException("this converter must be started before use"); 10 } 11 return ""; 12 } 13 14 }