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/NoOpLogger.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 java.util.ResourceBundle;
import java.util.function.Supplier;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

/**
 * Dummy version of a java.util.Logger.
 */
public class NoOpLogger extends Logger {

    protected NoOpLogger(String name) {
        super(name, null);
    }

    @Override
    public void log(LogRecord record) {
    }

    @Override
    public void log(Level level, String msg) {
    }

    @Override
    public void log(Level level, Supplier<String> msgSupplier) {
    }

    @Override
    public void log(Level level, String msg, Object param1) {
    }

    @Override
    public void log(Level level, String msg, Object[] params) {
    }

    @Override
    public void log(Level level, String msg, Throwable thrown) {
    }

    @Override
    public void log(Level level, Throwable thrown, Supplier<String> msgSupplier) {
    }

    @Override
    public void logp(Level level, String sourceClass, String sourceMethod, String msg) {
    }

    @Override
    public void logp(Level level, String sourceClass, String sourceMethod, Supplier<String> msgSupplier) {
    }

    @Override
    public void logp(Level level, String sourceClass, String sourceMethod, String msg, Object param1) {
    }

    @Override
    public void logp(Level level, String sourceClass, String sourceMethod, String msg, Object[] params) {
    }

    @Override
    public void logp(Level level, String sourceClass, String sourceMethod, String msg, Throwable thrown) {
    }

    @Override
    public void logp(Level level, String sourceClass, String sourceMethod, Throwable thrown,
            Supplier<String> msgSupplier) {
    }

    @Override
    public void logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String msg) {
    }

    @Override
    public void logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String msg,
            Object param1) {
    }

    @Override
    public void logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String msg,
            Object[] params) {
    }

    @Override
    public void logrb(Level level, String sourceClass, String sourceMethod, ResourceBundle bundle, String msg,
            Object... params) {
    }

    @Override
    public void logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String msg,
            Throwable thrown) {
    }

    @Override
    public void logrb(Level level, String sourceClass, String sourceMethod, ResourceBundle bundle, String msg,
            Throwable thrown) {
    }

    @Override
    public void entering(String sourceClass, String sourceMethod) {
    }

    @Override
    public void entering(String sourceClass, String sourceMethod, Object param1) {
    }

    @Override
    public void entering(String sourceClass, String sourceMethod, Object[] params) {
    }

    @Override
    public void exiting(String sourceClass, String sourceMethod) {
    }

    @Override
    public void exiting(String sourceClass, String sourceMethod, Object result) {
    }

    @Override
    public void throwing(String sourceClass, String sourceMethod, Throwable thrown) {
    }

    @Override
    public void severe(String msg) {
    }

    @Override
    public void warning(String msg) {
    }

    @Override
    public void info(String msg) {
    }

    @Override
    public void config(String msg) {
    }

    @Override
    public void fine(String msg) {
    }

    @Override
    public void finer(String msg) {
    }

    @Override
    public void finest(String msg) {
    }

    @Override
    public void severe(Supplier<String> msgSupplier) {
    }

    @Override
    public void warning(Supplier<String> msgSupplier) {
    }

    @Override
    public void info(Supplier<String> msgSupplier) {
    }

    @Override
    public void config(Supplier<String> msgSupplier) {
    }

    @Override
    public void fine(Supplier<String> msgSupplier) {
    }

    @Override
    public void finer(Supplier<String> msgSupplier) {
    }

    @Override
    public void finest(Supplier<String> msgSupplier) {
    }

    @Override
    public void setLevel(Level newLevel) throws SecurityException {
    }

    @Override
    public Level getLevel() {
        return Level.OFF;
    }

    @Override
    public boolean isLoggable(Level level) {
        return false;
    }
}

⏎ org/apache/logging/log4j/jul/NoOpLogger.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
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