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Java example source code file (

This example Java source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

deprecated, hashtable, map, mdc, object, string, suppresswarnings, util

The Java example source code

 * Copyright 2001-2004 The Apache Software Foundation.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.log4j;

import java.util.Hashtable;
import java.util.Map;

public class MDC {

    public static void put(String key, String value) {
        org.slf4j.MDC.put(key, value);

    public static void put(String key, Object value) {
        if (value != null) {
            put(key, value.toString());
        } else {
            put(key, null);

    public static Object get(String key) {
        return org.slf4j.MDC.get(key);

    public static void remove(String key) {

    public static void clear() {

     * This method is not part of the Log4J public API. However it 
     * has been called by other projects. This method is here temporarily  
     * until projects who are depending on this method release fixes. 
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static Hashtable getContext() {
        Map map = org.slf4j.MDC.getCopyOfContextMap();

        if (map != null) {
            return new Hashtable(map);
        } else {
            return new Hashtable();

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