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

package org.apache.fop.datatypes;

/**
 * Keep Value
 * Stores the different types of keeps in a single convenient format.
 */
public class KeepValue {
    /** constant for keep-with-always */
    public static final String KEEP_WITH_ALWAYS = "KEEP_WITH_ALWAYS";
    /** constant for automatic keep-with computation */
    public static final String KEEP_WITH_AUTO = "KEEP_WITH_AUTO";
    /** constant for a user-settable keep-with value (??) */
    public static final String KEEP_WITH_VALUE = "KEEP_WITH_VALUE";
    private String type = KEEP_WITH_AUTO;
    private int value;

    /**
     * Constructor
     * @param type one of "KEEP_WITH_ALWAYS", "KEEP_WITH_AUTO", or
     * "KEEP_WITH_VALUE"
     * @param val keep-with value to use (used only by KEEP_WITH_VALUE ??).
     */
    public KeepValue(String type, int val) {
        this.type = type;
        this.value = val;
    }

    /**
     * @return the keep-with value
     */
    public int getValue() {
        return value;
    }

    /**
     * @return the descriptive type
     */
    public String getType() {
        return type;
    }

    /**
     * @return string representation of this
     */
    public String toString() {
        return type;
    }

}

⏎ org/apache/fop/datatypes/KeepValue.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)