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/IIOPPrimaryToContactInfo.java

/*
 * Copyright (c) 2004, 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.List;

import com.sun.corba.se.pept.transport.ContactInfo;

/**
 * This interface is the "sticky manager" for IIOP failover.  The default
 * ORB does NOT contain a sticky manager.  One is registered by supplying
 * a class via the com.sun.CORBA.transport.ORBIIOPPrimaryToContactInfoClass.
 *
 * It uses the IIOP primary host/port (with a SocketInfo.IIOP_CLEAR_TEXT type)
 * as a key to map to the last ContactInfo that resulted in successful'
 * communication.
 *
 * It mainly prevents "fallback" - if a previously failed replica comes
 * back up we do NOT want to switch back to using it - particularly in the
 * case of statefull session beans.
 *
 * Note: This assumes static lists of replicas (e.g., AS 8.1 EE).
 * This does NOT work well with LOCATION_FORWARD.
 *
 * @author Harold Carr
 */
public interface IIOPPrimaryToContactInfo
{
    /**
     * @param primary - clear any state relating to primary.
     */
    public void reset(ContactInfo primary);

    /**
     * @param primary - the key.
     * @param previous - if null return true.  Otherwise, find previous in
     * <code>contactInfos</code> and if another <code>ContactInfo</code>
     * follows it in the list then return true.  Otherwise false.
     * @param contactInfos - the list of replicas associated with the
     * primary.
     */
    public boolean hasNext(ContactInfo primary,
                           ContactInfo previous,
                           List contactInfos);

    /**
     * @param primary - the key.
     * @param previous - if null then map primary to failover.  If failover is
     * empty then map primary to primary and return primary.  If failover is
     * non-empty then return failover.  If previous is non-null that
     * indicates that the previous failed.  Therefore, find previous in
     * contactInfos.  Map the <code>ContactInfo</code> following
     * previous to primary and return that <code>ContactInfo</code>.
     */
    public ContactInfo next(ContactInfo primary,
                            ContactInfo previous,
                            List contactInfos);

}

// End of file.

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