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/RepositoryIdHelper.java

/*
 * Copyright (c) 1999, 2001, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */
package org.omg.CORBA;


/**
* The Helper for <tt>RepositoryId</tt>.  For more information on
* Helper files, see <a href="doc-files/generatedfiles.html#helper">
* "Generated Files: Helper Files"</a>.<P>

* org/omg/CORBA/RepositoryIdHelper.java
* Generated by the IDL-to-Java compiler (portable), version "3.0"
* from ir.idl
* 03 June 1999 11:33:43 o'clock GMT+00:00
*/

abstract public class RepositoryIdHelper
{
  private static String  _id = "IDL:omg.org/CORBA/RepositoryId:1.0";

  public static void insert (org.omg.CORBA.Any a, String 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 String 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 ().create_string_tc (0);
      __typeCode = org.omg.CORBA.ORB.init ().create_alias_tc (org.omg.CORBA.RepositoryIdHelper.id (), "RepositoryId", __typeCode);
    }
    return __typeCode;
  }

  public static String id ()
  {
    return _id;
  }

  public static String read (org.omg.CORBA.portable.InputStream istream)
  {
    String value = null;
    value = istream.read_string ();
    return value;
  }

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

}

⏎ org/omg/CORBA/RepositoryIdHelper.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

⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)