What Is fop.jar? I got it from the fop-2.7-bin.zip.

fop.jar in fop-2.7-bin.zip is the JAR file for FOP 2.7, which is a print formatter driven by XSL formatting objects (XSL-FO). You can obtain fop.jar from the build folder of the fop-2.7-bin.zip file.

Below is the information about the fop.jar (2.2) file:

JAR File Size and Download Location:

JAR name: fop.jar, fop-2.7.jar
Target JDK version: 1.7
File name: fop.jar
File size: 4442817 bytes
Release date: 20-Jan-2022
Download: Apache FOP Website

Java source code files for fop.jar:

⏎ org/apache/fop/fonts/FontCacheManagerFactory.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.
 */

/* $Id$ */

package org.apache.fop.fonts;

import java.io.File;
import java.net.URI;

import org.apache.fop.apps.FOPException;

/**
 * A factory that provides the font caching manager mechanism.
 *
 */
public final class FontCacheManagerFactory {

    private FontCacheManagerFactory() {
    }

    /**
     * Create the default font caching mechanism.
     * @return the font cache manager
     */
    public static FontCacheManager createDefault() {
        return new FontCacheManagerImpl();
    }

    /**
     * Create a disabled font caching mechanism which by definition does nothing to cache fonts.
     * @return a completely restricted font cache manager
     */
    public static FontCacheManager createDisabled() {
        return new DisabledFontCacheManager();
    }

    private static final class FontCacheManagerImpl implements FontCacheManager {

        /** Provides a font cache file path **/
        private File cacheFile;

        private FontCache fontCache;

        public FontCache load() {
            if (fontCache == null) {
                fontCache = FontCache.loadFrom(getCacheFile(false));
                if (fontCache == null) {
                    fontCache = new FontCache();
                }
            }
            return fontCache;
        }

        public void save() throws FOPException {
            if (fontCache != null && fontCache.hasChanged()) {
                fontCache.saveTo(getCacheFile(true));
            }
        }

        public void delete() throws FOPException {
            if (!getCacheFile(true).delete()) {
                throw new FOPException("Failed to flush the font cache file '" + cacheFile + "'.");
            }
        }

        private File getCacheFile(boolean forWriting) {
            if (cacheFile != null) {
                return cacheFile;
            }
            return FontCache.getDefaultCacheFile(forWriting);
        }

        public void setCacheFile(URI fontCacheURI) {
            cacheFile = new File(fontCacheURI);
        }
    }

    private static final class DisabledFontCacheManager implements FontCacheManager {

        public FontCache load() {
            return null;
        }

        public void save() throws FOPException {
            // nop
        }

        public void delete() throws FOPException {
            throw new FOPException("Font Cache disabled");
        }

        public void setCacheFile(URI fontCacheURI) {
            // nop
        }
    }
}

⏎ org/apache/fop/fonts/FontCacheManagerFactory.java

Or download all of them as a single archive file:

File name: fop-2.7-src.zip
File size: 3401312 bytes
Release date: 2022-01-20
Download 

⇒ "fop" Command in fop-2.7-bin.zip

⇐ What Is fop-2.7-bin.zip

⇑ Download and Installing of FOP 2.x

⇑⇑ FAQ for FOP (Formatting Object Processor)