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/IOP/TAG_ORB_TYPE.java

package org.omg.IOP;


/**
* org/omg/IOP/TAG_ORB_TYPE.java .
* Generated by the IDL-to-Java compiler (portable), version "3.2"
* from c:/re/workspace/8-2-build-windows-amd64-cygwin/jdk8u191/11896/corba/src/share/classes/org/omg/PortableInterceptor/IOP.idl
* Saturday, October 6, 2018 9:30:42 AM PDT
*/

public interface TAG_ORB_TYPE
{

  /**
     * It is often useful in the real world to be able to identify the 
     * particular kind of ORB an object reference is coming from, to work 
     * around problems with that particular ORB, or exploit shared 
     * efficiencies. 
     * <p>
     * The <code>TAG_ORB_TYPE</code> component has an associated value of 
     * type unsigned long (Java long), encoded as a CDR encapsulation, 
     * designating an ORB type ID allocated by the OMG for the ORB type of the 
     * originating ORB. Anyone may register any ORB types by submitting 
     * a short (one-paragraph) description of the ORB type to the OMG, 
     * and will receive a new ORB type ID in return. A list of ORB type 
     * descriptions and values will be made available on the OMG web server. 
     * <p>
     * The <code>TAG_ORB_TYPE</code> component can appear at most once in 
     * any IOR profile. For profiles supporting IIOP 1.1 or greater, it 
     * is optionally present.
     */
  public static final int value = (int)(0L);
}

⏎ org/omg/IOP/TAG_ORB_TYPE.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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