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/fo/properties/SpacingPropertyMaker.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: SpacingPropertyMaker.java 985537 2010-08-14 17:17:00Z jeremias $ */

package org.apache.fop.fo.properties;

import org.apache.fop.fo.Constants;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;

/**
 * A maker which creates 'letter-spacing' and 'word-spacing' properties.
 * These two properties properties are standard space properties with
 * additinal support for the 'normal' enum value.
 */

public class SpacingPropertyMaker extends SpaceProperty.Maker {
    /**
     * Create a maker for [letter|word]-spacing.
     * @param propId the id for property.
     */
    public SpacingPropertyMaker(int propId) {
        super(propId);
    }

    /**
     * Support for the 'normal' value.
     * @param p the property to convert
     * @param propertyList the property list to use in conversion
     * @param fo the FO to use in conversion
     * @return the converted property
     * @throws PropertyException if a property conversion exception occurs
     */
    public Property convertProperty(Property p,
                                       PropertyList propertyList,
                                       FObj fo) throws PropertyException {
        if (p.getEnum() == Constants.EN_NORMAL) {
            return p;
        }
        return super.convertProperty(p, propertyList, fo);
    }
}

⏎ org/apache/fop/fo/properties/SpacingPropertyMaker.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)