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/afp/modca/ResourceGroup.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: ResourceGroup.java 1762060 2016-09-23 12:57:46Z ssteiner $ */

package org.apache.fop.afp.modca;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Set;

import org.apache.fop.afp.Streamable;

/**
 * A Resource Group contains a set of overlays.
 */
public class ResourceGroup extends AbstractNamedAFPObject {

    /** Set of resource uri */
    private final Set<AbstractNamedAFPObject> resourceSet = new java.util.HashSet<AbstractNamedAFPObject>();

    /**
     * Constructor for the ResourceGroup, this takes a
     * name parameter which must be 8 characters long.
     *
     * @param name the resource group name
     */
    public ResourceGroup(String name) {
        super(name);
    }

    /**
     * Add this named object to this resource group
     *
     * @param namedObject a named object
     * @throws IOException thrown if an I/O exception of some sort has occurred.
     */
    public void addObject(AbstractNamedAFPObject namedObject) throws IOException {
        resourceSet.add(namedObject);
    }

    /**
     * Returns the number of resources contained in this resource group
     *
     * @return the number of resources contained in this resource group
     */
    public int getResourceCount() {
        return resourceSet.size();
    }

    /** {@inheritDoc} */
    public void writeStart(OutputStream os) throws IOException {
        byte[] data = new byte[17];
        copySF(data, Type.BEGIN, Category.RESOURCE_GROUP);
        os.write(data);
    }

    /** {@inheritDoc} */
    public void writeContent(OutputStream os) throws IOException {
        for (Object object : resourceSet) {
            if (object instanceof Streamable) {
                Streamable streamableObject = (Streamable) object;
                streamableObject.writeToStream(os);
            }
        }
    }

    /** {@inheritDoc} */
    public void writeEnd(OutputStream os) throws IOException {
        byte[] data = new byte[17];
        copySF(data, Type.END, Category.RESOURCE_GROUP);
        os.write(data);
    }

    /** {@inheritDoc} */
    public String toString() {
        return this.name + " " + resourceSet/*getResourceMap()*/;
    }
}

⏎ org/apache/fop/afp/modca/ResourceGroup.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)