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/presentation/rmi/DynamicStub.java

/*
 * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.corba.se.spi.presentation.rmi ;

import java.rmi.RemoteException ;

import org.omg.CORBA.portable.Delegate ;
import org.omg.CORBA.portable.OutputStream ;

import org.omg.CORBA.ORB ;

/** Interface used to support dynamically generated stubs.
 * This supplies some methods that are found in
 * org.omg.CORBA.portable.ObjectImpl that are not available
 * in org.omg.CORBA.Object.
 */
public interface DynamicStub extends org.omg.CORBA.Object
{
    /** Similar to ObjectImpl._set_delegate
     */
    void setDelegate( Delegate delegate ) ;

    /** Similar to ObjectImpl._get_delegate
     */
    Delegate getDelegate() ;

    /** Similar to ObjectImpl._orb()
     */
    ORB getORB() ;

    /** Similar to ObjectImpl._ids
     */
    String[] getTypeIds() ;

    /** Connect this dynamic stub to an ORB.
     * Just as in standard RMI-IIOP, this is required after
     * a dynamic stub is deserialized from an ObjectInputStream.
     * It is not needed when unmarshalling from a
     * org.omg.CORBA.portable.InputStream.
     */
    void connect( ORB orb ) throws RemoteException ;

    boolean isLocal() ;

    OutputStream request( String operation, boolean responseExpected ) ;
}

⏎ com/sun/corba/se/spi/presentation/rmi/DynamicStub.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)