Source Code for Apache Log4j 1.2.17

Apache Log4j provides the interface that applications should code to and provides the adapter components required for implementers to create a logging implementation.

Bytecode (Java 1.4) for Apache Log4j is provided in a JAR file like log4j-1.2.17.jar.

Source Code files for Apache Log4j are provided in both binary packge like and source package like You can download them at Apache Log4j Website.

You can also browse Source Code files for Apache Log4j 1.2.17 below.



 * 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
 * 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.spi;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.helpers.LogLog;

// Contibutors: Mathias Bogaert

   RootLogger sits at the top of the logger hierachy. It is a
   regular logger except that it provides several guarantees.

   <p>First, it cannot be assigned a <code>null</code>
   level. Second, since root logger cannot have a parent, the
   {@link #getChainedLevel} method always returns the value of the
   level field without walking the hierarchy.

   @author Ceki G&uuml;lc&uuml;

public final class RootLogger extends Logger {
     The root logger names itself as "root". However, the root
     logger cannot be retrieved by name.
  public RootLogger(Level level) {

     Return the assigned level value without walking the logger
  public final Level getChainedLevel() {
    return level;

     Setting a null value to the level of the root logger may have catastrophic
     results. We prevent this here.

     @since 0.8.3 */
  public final void setLevel(Level level) {
    if (level == null) {
        "You have tried to set a null level to root.", new Throwable());
    } else {
      this.level = level;




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2015-12-14, 29162👍, 0💬