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Base Apache Log4j 1.2.17 fix the issus #4913 and #41214

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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.log4j.pattern;

import org.apache.log4j.spi.LoggingEvent;


/**
 * Formats the event thread name.
 *
 * @author Ceki Gülcü
 */
public class ThreadPatternConverter extends LoggingEventPatternConverter {
  /**
   * Singleton.
   */
  private static final ThreadPatternConverter INSTANCE =
    new ThreadPatternConverter();

  /**
   * Private constructor.
   */
  private ThreadPatternConverter() {
    super("Thread", "thread");
  }

  /**
   * Obtains an instance of ThreadPatternConverter.
   * @param options options, currently ignored, may be null.
   * @return instance of ThreadPatternConverter.
   */
  public static ThreadPatternConverter newInstance(
    final String[] options) {
    return INSTANCE;
  }

  /**
   * {@inheritDoc}
   */
  public void format(final LoggingEvent event, final StringBuffer toAppendTo) {
    toAppendTo.append(event.getThreadName());
  }
}