Source Code for Apache Log4j Core Implementation

Apache Log4j Core Implementation provides the functional components of the logging system. Users are free to create their own plugins and include them in the logging configuration. Apache Log4j Core is a required module to use Apache Log4j.

Bytecode (Java 8) for Apache Log4j Core Implementation is provided in a separate JAR file like log4j-core-2.14.1.jar.

Source Code files for Apache Log4j API 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 Core Implementation 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.logging.log4j.core.script;

import java.nio.charset.Charset;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.apache.logging.log4j.core.config.Node;
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.PluginFactory;
import org.apache.logging.log4j.core.util.ExtensionLanguageMapping;
import org.apache.logging.log4j.core.util.FileUtils;
import org.apache.logging.log4j.core.util.IOUtils;
import org.apache.logging.log4j.core.util.NetUtils;

 * Container for the language and body of a script file along with the file location.
@Plugin(name = "ScriptFile", category = Node.CATEGORY, printObject = true)
public class ScriptFile extends AbstractScript {

    private final Path filePath;
    private final boolean isWatched;

    public ScriptFile(final String name, final Path filePath, final String language, final boolean isWatched, final String scriptText) {
        super(name, language, scriptText);
        this.filePath = filePath;
        this.isWatched = isWatched;

    public Path getPath() {
        return this.filePath;

    public boolean isWatched() {
        return isWatched;

    public static ScriptFile createScript(
            // @formatter:off
            @PluginAttribute("name") String name,
            @PluginAttribute("language") String language,
            @PluginAttribute("path") final String filePathOrUri,
            @PluginAttribute("isWatched") final Boolean isWatched,
            @PluginAttribute("charset") final Charset charset) {
            // @formatter:on
        if (filePathOrUri == null) {
            LOGGER.error("No script path provided for ScriptFile");
            return null;
        if (name == null) {
            name = filePathOrUri;
        final URI uri = NetUtils.toURI(filePathOrUri);
        final File file = FileUtils.fileFromUri(uri);
        if (language == null && file != null) {
            final String fileExtension = FileUtils.getFileExtension(file);
            if (fileExtension != null) {
                final ExtensionLanguageMapping mapping = ExtensionLanguageMapping.getByExtension(fileExtension);
                if (mapping != null) {
                    language = mapping.getLanguage();
        if (language == null) {
  "No script language supplied, defaulting to {}", DEFAULT_LANGUAGE);
            language = DEFAULT_LANGUAGE;

        final Charset actualCharset = charset == null ? Charset.defaultCharset() : charset;
        String scriptText;
        try (final Reader reader = new InputStreamReader(
                file != null ? new FileInputStream(file) : uri.toURL().openStream(), actualCharset)) {
            scriptText = IOUtils.toString(reader);
        } catch (final IOException e) {
            LOGGER.error("{}: language={}, path={}, actualCharset={}", e.getClass().getSimpleName(),
                    language, filePathOrUri, actualCharset);
            return null;
        final Path path = file != null ? Paths.get(file.toURI()) : Paths.get(uri);
        if (path == null) {
            LOGGER.error("Unable to convert {} to a Path", uri.toString());
            return null;
        return new ScriptFile(name, path, language, isWatched == null ? Boolean.FALSE : isWatched, scriptText);

    public String toString() {
        final StringBuilder sb = new StringBuilder();
        if (!(getName().equals(filePath.toString()))) {
            sb.append("name=").append(getName()).append(", ");
        if (getLanguage() != null) {
            sb.append(", language=").append(getLanguage());
        sb.append(", isWatched=").append(isWatched);
        return sb.toString();



Or download all of them as a single archive file:

File name: log4j-core-2.14.1-sources.jar
File size: 1281358 bytes
Release date: 2021-03-06


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