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/AbstractDescriptor.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: AbstractDescriptor.java 1610839 2014-07-15 20:25:58Z vhennebert $ */

package org.apache.fop.afp.modca;

/**
 * Base class for AFP descriptor objects
 */
public abstract class AbstractDescriptor extends AbstractTripletStructuredObject {

    /** width of this descriptor */
    protected int width;
    /** height of this descriptor */
    protected int height;
    /** width resolution of this descriptor */
    protected int widthRes;
    /** height resolution of this descriptor */
    protected int heightRes;

    /**
     * Default constructor
     */
    public AbstractDescriptor() {
    }

    /**
     * Constructor a PresentationTextDescriptor for the specified
     * width and height.
     *
     * @param width The width of the page.
     * @param height The height of the page.
     * @param widthRes The width resolution of the page.
     * @param heightRes The height resolution of the page.
     */
    public AbstractDescriptor(int width, int height, int widthRes, int heightRes) {
        this.width = width;
        this.height = height;
        this.widthRes = widthRes;
        this.heightRes = heightRes;
    }

    /** {@inheritDoc} */
    public String toString() {
        return "width=" + width
        + ", height=" + height
        + ", widthRes=" + widthRes
        + ", heightRes=" + heightRes;
    }

    /**
     * Returns the width
     *
     * @return the width
     */
    public int getWidth() {
        return this.width;
    }

    /**
     * Returns the height
     *
     * @return the height
     */
    public int getHeight() {
        return this.height;
    }

}

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