Source Code for Apache Log4j 1.2 Bridge

Apache Log4j 1.2 Bridge allows applications coded to use Log4j 1.2 API to use Log4j 2 instead.

Bytecode (Java 8) for Apache Log4j 1.2 Bridge is provided in a separate JAR file like log4j-1.2-api-2.14.1.jar.

Source Code files for Apache Log4j 1.2 Bridge 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 1.2 Bridge 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.log4j.config;

import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.ConfigurationFactory;
import org.apache.logging.log4j.core.config.ConfigurationSource;
import org.apache.logging.log4j.core.config.Order;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.util.PropertiesUtil;

 * Configures Log4j from a log4j 1 format properties file.
@Plugin(name = "Log4j1PropertiesConfigurationFactory", category = ConfigurationFactory.CATEGORY)
public class PropertiesConfigurationFactory extends ConfigurationFactory {

     * File name prefix for test configurations.
    protected static final String TEST_PREFIX = "log4j-test";

     * File name prefix for standard configurations.
    protected static final String DEFAULT_PREFIX = "log4j";

    protected String[] getSupportedTypes() {
        if (!PropertiesUtil.getProperties().getBooleanProperty(ConfigurationFactory.LOG4J1_EXPERIMENTAL, Boolean.FALSE)) {
            return null;
        return new String[] {".properties"};

    public Configuration getConfiguration(LoggerContext loggerContext, ConfigurationSource source) {
        int interval = PropertiesUtil.getProperties().getIntegerProperty(Log4j1Configuration.MONITOR_INTERVAL, 0);
        return new PropertiesConfiguration(loggerContext, source, interval);

    protected String getTestPrefix() {
        return TEST_PREFIX;

    protected String getDefaultPrefix() {
        return DEFAULT_PREFIX;

    protected String getVersion() {
        return LOG4J1_VERSION;



Or download all of them as a single archive file:

File name: log4j-1.2-api-2.14.1-sources.jar
File size: 168047 bytes
Release date: 2021-03-06


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