1   package org.apache.log4j;
2   
3   public class MDC {
4   
5     public static void put(String key, String value) {
6       org.slf4j.MDC.put(key, value);
7     }
8     
9     public static void put(String key, Object value) {
10      if (value != null) {
11        put(key, value.toString());
12      } else {
13        put(key, null);
14      }
15    }
16    
17    public static Object get(String key) {
18      return org.slf4j.MDC.get(key);
19    }
20    
21    public static void remove(String key) {
22      org.slf4j.MDC.remove(key);
23    }
24    
25    public static void clear() {
26      org.slf4j.MDC.clear();
27    }
28  }