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 apache-log4j-2.14.1-bin.zip and source package like apache-log4j-2.14.1-src.zip. You can download them at Apache Log4j Website.

You can also browse Source Code files for Apache Log4j Core Implementation 2.14.1 below.

⏎ org/apache/logging/log4j/core/jmx/StatusLoggerAdminMBean.java

/*
 * 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.logging.log4j.core.jmx;

import java.util.List;

import javax.management.ObjectName;

import org.apache.logging.log4j.status.StatusData;

/**
 * The MBean interface for monitoring and managing the {@code StatusLogger}.
 */
public interface StatusLoggerAdminMBean {
    /**
     * ObjectName pattern ({@value}) for StatusLoggerAdmin MBeans.
     * This pattern contains a variable, which is the name of the logger context.
     * <p>
     * You can find all registered StatusLoggerAdmin MBeans like this:
     * </p>
     * <pre>
     * MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
     * String pattern = String.format(StatusLoggerAdminMBean.PATTERN, &quot;*&quot;);
     * Set&lt;ObjectName&gt; statusLoggerNames = mbs.queryNames(new ObjectName(pattern), null);
     * </pre>
     * <p>
     * Some characters are not allowed in ObjectNames. The logger context name
     * may be quoted. When StatusLoggerAdmin MBeans are
     * registered, their ObjectNames are created using this pattern as follows:
     * </p>
     * <pre>
     * String ctxName = Server.escape(loggerContext.getName());
     * String name = String.format(PATTERN, ctxName);
     * ObjectName objectName = new ObjectName(name);
     * </pre>
     * @see Server#escape(String)
     */
    String PATTERN = Server.DOMAIN + ":type=%s,component=StatusLogger";

    /**
     * Notifications with this type have a {@code StatusData} userData object
     * and a {@code null} message.
     */
    String NOTIF_TYPE_DATA = "com.apache.logging.log4j.core.jmx.statuslogger.data";

    /**
     * Notifications with this type have a formatted status data message string
     * but no {@code StatusData} in their userData field.
     */
    String NOTIF_TYPE_MESSAGE = "com.apache.logging.log4j.core.jmx.statuslogger.message";

    /**
     * Returns the {@code ObjectName} that this status logger mbean is registered with.
     * @return the ObjectName of this StatusLogger MBean
     */
    ObjectName getObjectName();

    /**
     * Returns a list with the most recent {@code StatusData} objects in the
     * status history. The list has up to 200 entries by default but the length
     * can be configured with system property {@code "log4j2.status.entries"}.
     * <p>
     * Note that the returned objects may contain {@code Throwable}s from
     * external libraries.
     * </p>
     * <p>
     * JMX clients calling this method must be prepared to deal with the errors
     * that occur if they do not have the class definition for such
     * {@code Throwable}s in their classpath.
     * </p>
     *
     * @return the most recent messages logged by the {@code StatusLogger}.
     */
    List<StatusData> getStatusData();

    /**
     * Returns a string array with the most recent messages in the status
     * history. The list has up to 200 entries by default but the length can be
     * configured with system property {@code "log4j2.status.entries"}.
     *
     * @return the most recent messages logged by the {@code StatusLogger}.
     */
    String[] getStatusDataHistory();

    /**
     * Returns the {@code StatusLogger} level as a String.
     *
     * @return the {@code StatusLogger} level.
     */
    String getLevel();

    /**
     * Sets the {@code StatusLogger} level to the specified value.
     *
     * @param level the new {@code StatusLogger} level.
     * @throws IllegalArgumentException if the specified level is not one of
     *             "OFF", "FATAL", "ERROR", "WARN", "INFO", "DEBUG", "TRACE",
     *             "ALL"
     */
    void setLevel(String level);

    /**
     * Returns the name of the LoggerContext that the {@code StatusLogger} is associated with.
     * @return logger context name
     */
    String getContextName();
}

⏎ org/apache/logging/log4j/core/jmx/StatusLoggerAdminMBean.java

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
Download 

⇒ Source Code for Apache Log4j JDK Logging Adapter

⇐ Source Code for Apache Log4j API

⇑ Downloading and Reviewing Apache Log4j Packages

⇑⇑ FAQ for Apache Log4j