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.util.Stack;

 * Internal utility to share a fast implementation of {@link #getCurrentStackTrace()}
 * with the java 9 implementation of {@link StackLocator}.
final class PrivateSecurityManagerStackTraceUtil {

    private static final PrivateSecurityManager SECURITY_MANAGER;

    static {
        PrivateSecurityManager psm;
        try {
            final SecurityManager sm = System.getSecurityManager();
            if (sm != null) {
                sm.checkPermission(new RuntimePermission("createSecurityManager"));
            psm = new PrivateSecurityManager();
        } catch (final SecurityException ignored) {
            psm = null;

        SECURITY_MANAGER = psm;

    private PrivateSecurityManagerStackTraceUtil() {
        // Utility Class

    static boolean isEnabled() {
        return SECURITY_MANAGER != null;

    // benchmarks show that using the SecurityManager is much faster than looping through getCallerClass(int)
    static Stack<Class<?>> getCurrentStackTrace() {
        final Class<?>[] array = SECURITY_MANAGER.getClassContext();
        final Stack<Class<?>> classes = new Stack<>();
        for (final Class<?> clazz : array) {
        return classes;

    private static final class PrivateSecurityManager extends SecurityManager {

        protected Class<?>[] getClassContext() {
            return super.getClassContext();




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


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