JRE 8 rt.jar is the JAR file for JRE 8 RT (Runtime) libraries. JRE (Java Runtime) 8 is the runtime environment included in JDK 8. JRE 8 rt.jar libraries are divided into 6 packages:

com.* - Internal Oracle and Sun Microsystems libraries
java.* - Standard Java API libraries.
javax.* - Extended Java API libraries.
jdk.* -  JDK supporting libraries.
org.* - Third party libraries.
sun.* - Old libraries developed by Sun Microsystems.

JAR File Information:

Directory of C:\fyicenter\jdk-1.8.0_191\jre\lib
      63,596,151 rt.jar

Here is the list of Java classes of the com.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.

⏎ com/sun/corba/se/impl/oa/poa/RequestProcessingPolicyImpl.java

/*
 * Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.corba.se.impl.oa.poa;

import org.omg.CORBA.*;
import org.omg.PortableServer.*;

public class RequestProcessingPolicyImpl
    extends org.omg.CORBA.LocalObject implements RequestProcessingPolicy {

    public RequestProcessingPolicyImpl(RequestProcessingPolicyValue
                                       value) {
        this.value = value;
    }

    public RequestProcessingPolicyValue value() {
        return value;
    }

    public int policy_type()
    {
        return REQUEST_PROCESSING_POLICY_ID.value ;
    }

    public Policy copy() {
        return new RequestProcessingPolicyImpl(value);
    }

    public void destroy() {
        value = null;
    }

    private RequestProcessingPolicyValue value;

    public String toString()
    {
        String type = null ;
        switch (value.value()) {
            case RequestProcessingPolicyValue._USE_ACTIVE_OBJECT_MAP_ONLY :
                type = "USE_ACTIVE_OBJECT_MAP_ONLY" ;
                break ;
            case RequestProcessingPolicyValue._USE_DEFAULT_SERVANT :
                type = "USE_DEFAULT_SERVANT" ;
                break ;
            case RequestProcessingPolicyValue._USE_SERVANT_MANAGER :
                type = "USE_SERVANT_MANAGER" ;
                break ;
        }

        return "RequestProcessingPolicy[" + type + "]" ;
    }
}

⏎ com/sun/corba/se/impl/oa/poa/RequestProcessingPolicyImpl.java

Or download all of them as a single archive file:

File name: jre-rt-com-1.8.0_191-src.zip
File size: 8099783 bytes
Release date: 2018-10-28
Download 

⇒ Backup JDK 8 Installation Directory

⇐ JRE 8 rt.jar - org.* Package Source Code

⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)