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.pattern;

import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.pattern.ConverterKeys;
import org.apache.logging.log4j.core.pattern.LogEventPatternConverter;
import org.apache.logging.log4j.core.pattern.PatternConverter;
import org.apache.logging.log4j.util.Strings;

import java.util.List;

 * Returns the event's NDC in a StringBuilder.
@Plugin(name = "Log4j1NdcPatternConverter", category = PatternConverter.CATEGORY)
@ConverterKeys({ "ndc" })
public final class Log4j1NdcPatternConverter extends LogEventPatternConverter {
     * Singleton.
    private static final Log4j1NdcPatternConverter INSTANCE =
        new Log4j1NdcPatternConverter();

     * Private constructor.
    private Log4j1NdcPatternConverter() {
        super("Log4j1NDC", "ndc");

     * Obtains an instance of NdcPatternConverter.
     * @param options options, may be null.
     * @return instance of NdcPatternConverter.
    public static Log4j1NdcPatternConverter newInstance(final String[] options) {
        return INSTANCE;

    public void format(final LogEvent event, final StringBuilder toAppendTo) {
        final List<String> ndc = event.getContextStack().asList();
        toAppendTo.append(Strings.join(ndc, ' '));



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