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/spi/transport/CorbaTransportManager.java

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

package com.sun.corba.se.spi.transport;

import java.util.Collection;

import com.sun.corba.se.pept.transport.TransportManager;
import com.sun.corba.se.spi.ior.IORTemplate;
import com.sun.corba.se.spi.ior.ObjectAdapterId;

// REVISIT - impl/poa specific:
import com.sun.corba.se.impl.oa.poa.Policies;

/**
 * @author Harold Carr
 */
public interface CorbaTransportManager
    extends
        TransportManager
{
    public static final String SOCKET_OR_CHANNEL_CONNECTION_CACHE =
        "SocketOrChannelConnectionCache";

    public Collection getAcceptors(String objectAdapterManagerId,
                                   ObjectAdapterId objectAdapterId);

    // REVISIT - POA specific policies
    public void addToIORTemplate(IORTemplate iorTemplate,
                                 Policies policies,
                                 String codebase,
                                 String objectAdapterManagerId,
                                 ObjectAdapterId objectAdapterId);
}

// End of file.

⏎ com/sun/corba/se/spi/transport/CorbaTransportManager.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)