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.config;

import org.apache.logging.log4j.core.util.Loader;
import org.apache.logging.log4j.status.StatusLogger;
import org.apache.logging.log4j.util.PropertiesUtil;

 * Factory for ReliabilityStrategies.
public final class ReliabilityStrategyFactory {
    private ReliabilityStrategyFactory() {

     * Returns a new {@code ReliabilityStrategy} instance based on the value of system property
     * {@code log4j.ReliabilityStrategy}. If not value was specified this method returns a new
     * {@code AwaitUnconditionallyReliabilityStrategy}.
     * <p>
     * Valid values for this system property are {@code "AwaitUnconditionally"} (use
     * {@code AwaitUnconditionallyReliabilityStrategy}), {@code "Locking"} (use {@code LockingReliabilityStrategy}) and
     * {@code "AwaitCompletion"} (use the default {@code AwaitCompletionReliabilityStrategy}).
     * <p>
     * Users may also use this system property to specify the fully qualified class name of a class that implements the
     * {@code ReliabilityStrategy} and has a constructor that accepts a single {@code LoggerConfig} argument.
     * @param loggerConfig the LoggerConfig the resulting {@code ReliabilityStrategy} is associated with
     * @return a ReliabilityStrategy that helps the specified LoggerConfig to log events reliably during or after a
     *         configuration change
    public static ReliabilityStrategy getReliabilityStrategy(final LoggerConfig loggerConfig) {

        final String strategy = PropertiesUtil.getProperties().getStringProperty("log4j.ReliabilityStrategy",
        if ("AwaitCompletion".equals(strategy)) {
            return new AwaitCompletionReliabilityStrategy(loggerConfig);
        if ("AwaitUnconditionally".equals(strategy)) {
            return new AwaitUnconditionallyReliabilityStrategy(loggerConfig);
        if ("Locking".equals(strategy)) {
            return new LockingReliabilityStrategy(loggerConfig);
        try {
            final Class<? extends ReliabilityStrategy> cls = Loader.loadClass(strategy).asSubclass(
            return cls.getConstructor(LoggerConfig.class).newInstance(loggerConfig);
        } catch (final Exception dynamicFailed) {
                    "Could not create ReliabilityStrategy for '{}', using default AwaitCompletionReliabilityStrategy: {}", strategy, dynamicFailed);
            return new AwaitCompletionReliabilityStrategy(loggerConfig);



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


Source Code for Apache Log4j JDK Logging Adapter

Source Code for Apache Log4j API

Downloading and Reviewing Apache Log4j Packages

⇑⇑ FAQ for Apache Log4j

2015-11-03, 85900👍, 0💬