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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.util;

import java.util.HashMap;

/**
 * This class extends InheritableThreadLocal so that children threads get a copy
 * of the parent's hashmap.
 * 
 * @author Ceki Gülcü
 */
public class CopyOnInheritThreadLocal extends InheritableThreadLocal> {

    /**
     * Child threads should get a copy of the parent's hashmap.
     */
    @Override
    protected HashMap childValue(HashMap parentValue) {
        if (parentValue == null) {
            return null;
        } else {
            return new HashMap(parentValue);
        }
    }

}