Source Code for Apache Log4j NoSQL Appenders

Apache Log4j NoSQL Appenders allows applications to send events to NoSQL repositories. To use it, you need both the log4j-nosql as well as the appropriate driver for your NoSQL database type.

Bytecode (Java 8) for Apache Log4j NoSQL Appenders is provided in a separate JAR file like log4j-nosql-2.3.jar.

Source Code files for Apache Log4j NoSQL Appenders 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 NoSQL Appenders 2.3 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.logging.log4j.nosql.appender;

import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.core.util.Booleans;

 * This Appender writes logging events to a NoSQL database using a configured NoSQL provider. It requires
 * implementations of {@link NoSqlObject}, {@link NoSqlConnection}, and {@link NoSqlProvider} to "know" how to write
 * events to the chosen NoSQL database. Two provider implementations are provided: MongoDB
 * (org.mongodb:mongo-java-driver:2.11.1 or newer must be on the classpath) and Apache CouchDB
 * (org.lightcouch:lightcouch:0.0.5 or newer must be on the classpath). For examples on how to write your own NoSQL
 * provider, see the simple source code for the MongoDB and CouchDB providers.
 * @see NoSqlObject
 * @see NoSqlConnection
 * @see NoSqlProvider
@Plugin(name = "NoSql", category = "Core", elementType = "appender", printObject = true)
public final class NoSqlAppender extends AbstractDatabaseAppender<NoSqlDatabaseManager<?>> {
    private static final long serialVersionUID = 1L;
    private final String description;

    private NoSqlAppender(final String name, final Filter filter, final boolean ignoreExceptions,
                          final NoSqlDatabaseManager<?> manager) {
        super(name, filter, ignoreExceptions, manager);
        this.description = this.getName() + "{ manager=" + this.getManager() + " }";

    public String toString() {
        return this.description;

     * Factory method for creating a NoSQL appender within the plugin manager.
     * @param name The name of the appender.
     * @param ignore If {@code "true"} (default) exceptions encountered when appending events are logged; otherwise
     *               they are propagated to the caller.
     * @param filter The filter, if any, to use.
     * @param bufferSize If an integer greater than 0, this causes the appender to buffer log events and flush whenever
     *                   the buffer reaches this size.
     * @param provider The NoSQL provider that provides connections to the chosen NoSQL database.
     * @return a new NoSQL appender.
    public static NoSqlAppender createAppender(
            @PluginAttribute("name") final String name,
            @PluginAttribute("ignoreExceptions") final String ignore,
            @PluginElement("Filter") final Filter filter,
            @PluginAttribute("bufferSize") final String bufferSize,
            @PluginElement("NoSqlProvider") final NoSqlProvider<?> provider) {
        if (provider == null) {
            LOGGER.error("NoSQL provider not specified for appender [{}].", name);
            return null;

        final int bufferSizeInt = AbstractAppender.parseInt(bufferSize, 0);
        final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);

        final String managerName = "noSqlManager{ description=" + name + ", bufferSize=" + bufferSizeInt
                + ", provider=" + provider + " }";

        final NoSqlDatabaseManager<?> manager = NoSqlDatabaseManager.getNoSqlDatabaseManager(
                managerName, bufferSizeInt, provider
        if (manager == null) {
            return null;

        return new NoSqlAppender(name, filter, ignoreExceptions, manager);



Or download all of them as a single archive file:

File name: log4j-jmx-nosql-2.3-sources.jar
File size: 23448 bytes
Release date: 2020-07-03


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