Source Code for Apache Log4j SLF4J Binding

Apache Log4j SLF4J Binding allows applications coded to the SLF4J API to use Log4j 2 as the implementation.

Bytecode (Java 8) for Apache Log4j SLF4J Binding is provided in a separate JAR file like log4j-slf4j-impl-2.14.1.jar.

Source Code files for Apache Log4j IOStreams 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 SLF4J Binding 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.slf4j;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.LoggingException;
import org.apache.logging.log4j.spi.AbstractLoggerAdapter;
import org.apache.logging.log4j.spi.LoggerContext;
import org.apache.logging.log4j.util.StackLocatorUtil;
import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;

 * Log4j implementation of SLF4J ILoggerFactory interface.
public class Log4jLoggerFactory extends AbstractLoggerAdapter<Logger> implements ILoggerFactory {

    private static final String FQCN = Log4jLoggerFactory.class.getName();
    private static final String PACKAGE = "org.slf4j";
    private static final String TO_SLF4J_CONTEXT = "org.apache.logging.slf4j.SLF4JLoggerContext";

    protected Logger newLogger(final String name, final LoggerContext context) {
        final String key = Logger.ROOT_LOGGER_NAME.equals(name) ? LogManager.ROOT_LOGGER_NAME : name;
        return new Log4jLogger(validateContext(context).getLogger(key), name);

    protected LoggerContext getContext() {
        final Class<?> anchor = StackLocatorUtil.getCallerClass(FQCN, PACKAGE);
        return anchor == null ? LogManager.getContext() : getContext(StackLocatorUtil.getCallerClass(anchor));
    private LoggerContext validateContext(final LoggerContext context) {
        if (TO_SLF4J_CONTEXT.equals(context.getClass().getName())) {
            throw new LoggingException("log4j-slf4j-impl cannot be present with log4j-to-slf4j");
        return context;



Or download all of them as a single archive file:

File name: log4j-slf4j-impl-2.14.1-sources.jar
File size: 23635 bytes
Release date: 2021-03-06


Source Code for Apache Log4j to SLF4J Adapter

Source Code for Apache Log4j Commons Logging Bridge

Downloading and Reviewing Apache Log4j Packages

⇑⇑ FAQ for Apache Log4j

2015-11-04, 14819👍, 0💬