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.bridge;

import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Appender;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.filter.CompositeFilter;

 * Binds a Log4j 1.x Appender to Log4j 2.
public class AppenderAdapter {

    private final Appender appender;
    private final Adapter adapter;

     * Constructor.
     * @param appender The Appender to wrap.
    public AppenderAdapter(Appender appender) {
        this.appender = appender;
        org.apache.logging.log4j.core.Filter appenderFilter = null;
        if (appender.getFilter() != null) {
            if (appender.getFilter().getNext() != null) {
                org.apache.log4j.spi.Filter filter = appender.getFilter();
                List<org.apache.logging.log4j.core.Filter> filters = new ArrayList<>();
                while (filter != null) {
                    filters.add(new FilterAdapter(filter));
                    filter = filter.getNext();
                appenderFilter = CompositeFilter.createFilters(filters.toArray(new Filter[0]));
            } else {
                appenderFilter = new FilterAdapter(appender.getFilter());
        this.adapter = new Adapter(appender.getName(), appenderFilter, null, true, null);

    public Adapter getAdapter() {
        return adapter;

    public class Adapter extends AbstractAppender {

        protected Adapter(final String name, final Filter filter, final Layout<? extends Serializable> layout,
            final boolean ignoreExceptions, final Property[] properties) {
            super(name, filter, layout, ignoreExceptions, properties);

        public void append(LogEvent event) {
            appender.doAppend(new LogEventAdapter(event));

        public void stop() {

        public Appender getAppender() {
            return appender;



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