Source Code for Apache Log4j Core Implementation

Apache Log4j Core Implementation provides the functional components of the logging system. Users are free to create their own plugins and include them in the logging configuration. Apache Log4j Core is a required module to use Apache Log4j.

Bytecode (Java 8) for Apache Log4j Core Implementation is provided in a separate JAR file like log4j-core-2.14.1.jar.

Source Code files for Apache Log4j API 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 Core Implementation 2.14.1 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.logging.log4j.core.jmx;

import java.util.Objects;


import org.apache.logging.log4j.core.selector.ContextSelector;

 * Implementation of the {@code ContextSelectorAdminMBean} interface.
public class ContextSelectorAdmin implements ContextSelectorAdminMBean {

    private final ObjectName objectName;
    private final ContextSelector selector;

     * Constructs a new {@code ContextSelectorAdmin}.
     * @param contextName name of the LoggerContext under which to register this
     *            ContextSelectorAdmin. Note that the ContextSelector may be
     *            registered multiple times, once for each LoggerContext. In web
     *            containers, each web application has its own LoggerContext and
     *            by associating the ContextSelector with the LoggerContext, all
     *            associated MBeans can be unloaded when the web application is
     *            undeployed.
     * @param selector the instrumented object
    public ContextSelectorAdmin(final String contextName, final ContextSelector selector) {
        this.selector = Objects.requireNonNull(selector, "ContextSelector");
        try {
            final String mbeanName = String.format(PATTERN, Server.escape(contextName));
            objectName = new ObjectName(mbeanName);
        } catch (final Exception e) {
            throw new IllegalStateException(e);

     * Returns the {@code ObjectName} of this mbean.
     * @return the {@code ObjectName}
     * @see ContextSelectorAdminMBean#PATTERN
    public ObjectName getObjectName() {
        return objectName;

    public String getImplementationClassName() {
        return selector.getClass().getName();



Or download all of them as a single archive file:

File name: log4j-core-2.14.1-sources.jar
File size: 1281358 bytes
Release date: 2021-03-06


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