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Apache Commons Daemon software provides an alternative invocation mechanism for unix-daemon-like Java code.

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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.commons.daemon;

/**
 * Tags a Daemon as supporting some kind of
 * signaling method that allows the java application to
 * perform a custom action.
 * 
 * User must implement a signal method that will be called from
 * native upon receiving {@code SIGUSR2} signal from the operating system.
 * 
 * @author Nick Griffiths 
 * @author Mladen Turk 
 * @version $Id: DaemonUserSignal.java 1204010 2011-11-19 16:15:23Z ggregory $
 */
public interface DaemonUserSignal
{

    /**
     * Performs a custom action on received user signal.
     */
    void signal();

}