Source Code for Apache Log4j API

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

Bytecode (Java 8) for Apache Log4j API is provided in a separate JAR file like log4j-api-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 API 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.util;

import java.lang.reflect.Method;

import org.apache.logging.log4j.LoggingException;

 * Base64 encodes Strings. This utility is only necessary because the mechanism to do this changed in Java 8 and
 * the original method was removed in Java 9.
public final class Base64Util {

    private static Method encodeMethod = null;
    private static Object encoder = null;

    static {
        try {
            Class<?> clazz = LoaderUtil.loadClass("java.util.Base64");
            Class<?> encoderClazz = LoaderUtil.loadClass("java.util.Base64$Encoder");
            Method method = clazz.getMethod("getEncoder");
            encoder = method.invoke(null);
            encodeMethod = encoderClazz.getMethod("encodeToString", byte[].class);
        } catch (Exception ex) {
            try {
                Class<?> clazz = LoaderUtil.loadClass("javax.xml.bind.DataTypeConverter");
                encodeMethod = clazz.getMethod("printBase64Binary");
            } catch (Exception ex2) {
                LowLevelLogUtil.logException("Unable to create a Base64 Encoder", ex2);

    private Base64Util() {

    public static String encode(String str) {
        if (str == null) {
            return null;
        byte [] data = str.getBytes();
        if (encodeMethod != null) {
            try {
                return (String) encodeMethod.invoke(encoder, data);
            } catch (Exception ex) {
                throw new LoggingException("Unable to encode String", ex);
        throw new LoggingException("No Encoder, unable to encode string");



Or download all of them as a single archive file:

File name: log4j-api-2.14.1-sources.jar
File size: 264773 bytes
Release date: 2021-03-06


Source Code for Apache Log4j Core Implementation

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