Apache Log4j JDK Logging Adapter is a custom implementation of java.util.logging.LogManager that uses Log4j. This adapter can be used with either the Log4j API or Log4j Core.

Bytecode (Java 8) for Apache Log4j JDK Logging Adapter is provided in a separate JAR file like log4j-jul-2.14.1.jar.

Source Code files for Apache Log4j API are provided in both binary packge like apache-log4j-2.14.1-bin.zip and source package like apache-log4j-2.14.1-src.zip. You can download them at Apache Log4j Website.

You can also browse Source Code files for Apache Log4j JDK Logging Adapter 2.14.1 below.

⏎ org/apache/logging/log4j/jul/WrappedLogger.java

/*
 * 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the license for the specific language governing permissions and
 * limitations under the license.
 */

package org.apache.logging.log4j.jul;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.spi.ExtendedLogger;
import org.apache.logging.log4j.spi.ExtendedLoggerWrapper;

/**
 * Wrapper class to ensure proper FQCN support in Logger calls.
 *
 * @since 2.1
 */
class WrappedLogger extends ExtendedLoggerWrapper {

    private static final long serialVersionUID = 1L;
    private static final String FQCN = ApiLogger.class.getName();

    WrappedLogger(final ExtendedLogger logger) {
        super(logger, logger.getName(), logger.getMessageFactory());
    }

    @Override
    public void log(final Level level, final String message, final Throwable t) {
        logIfEnabled(FQCN, level, null, message, t);
    }

    @Override
    public void log(final Level level, final String message, final Object... params) {
        logIfEnabled(FQCN, level, null, message, params);
    }

    @Override
    public void log(final Level level, final String message) {
        logIfEnabled(FQCN, level, null, message);
    }

    @Override
    public void entry() {
        entry(FQCN);
    }

    @Override
    public void entry(final Object... params) {
        entry(FQCN, params);
    }

    @Override
    public void exit() {
        exit(FQCN, null);
    }

    @Override
    public <R> R exit(final R result) {
        return exit(FQCN, result);
    }

    @Override
    public <T extends Throwable> T throwing(final T t) {
        return throwing(FQCN, LevelTranslator.toLevel(java.util.logging.Level.FINER), t);
    }
}

⏎ org/apache/logging/log4j/jul/WrappedLogger.java

Or download all of them as a single archive file:

File name: log4j-jul-2.14.1-sources.jar
File size: 24567 bytes
Release date: 2021-03-06
Download 

⇒ Source Code for Apache Log4j Commons Logging Bridge

⇐ Source Code for Apache Log4j Core Implementation

⇑ Downloading and Reviewing Apache Log4j Packages

⇑⇑ FAQ for Apache Log4j