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 org.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.

⏎ org/omg/CORBA/ObjectHelper.java

/*
 * Copyright (c) 1998, 2001, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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/**
* The Helper for <tt>Object</tt>.  For more information on
* Helper files, see <a href="doc-files/generatedfiles.html#helper">
* "Generated Files: Helper Files"</a>.<P>
*/

/*
 * Licensed Materials - Property of IBM
 * RMI-IIOP v1.0
 * Copyright IBM Corp. 1998 1999  All Rights Reserved
 *
 */

package org.omg.CORBA;

abstract public class ObjectHelper
{
    private static String  _id = "";

    public static void insert (org.omg.CORBA.Any a, org.omg.CORBA.Object that)
    {
        org.omg.CORBA.portable.OutputStream out = a.create_output_stream ();
        a.type (type ());
        write (out, that);
        a.read_value (out.create_input_stream (), type ());
    }

    public static org.omg.CORBA.Object extract (org.omg.CORBA.Any a)
    {
        return read (a.create_input_stream ());
    }

    private static org.omg.CORBA.TypeCode __typeCode = null;
    synchronized public static org.omg.CORBA.TypeCode type ()
    {
        if (__typeCode == null)
            {
                __typeCode = org.omg.CORBA.ORB.init ().get_primitive_tc (TCKind.tk_objref);
            }
        return __typeCode;
    }

    public static String id ()
    {
        return _id;
    }

    public static org.omg.CORBA.Object read (org.omg.CORBA.portable.InputStream istream)
    {
        return istream.read_Object ();
    }

    public static void write (org.omg.CORBA.portable.OutputStream ostream, org.omg.CORBA.Object value)
    {
        ostream.write_Object (value);
    }

}

⏎ org/omg/CORBA/ObjectHelper.java

Or download all of them as a single archive file:

File name: jre-rt-org-1.8.0_191-src.zip
File size: 951125 bytes
Release date: 2018-10-28
Download 

⇒ JRE 8 rt.jar - com.* Package Source Code

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

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⇑⇑ FAQ for JDK (Java Development Kit)