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

⏎ javax/rmi/CORBA/StubDelegate.java

/*
 * Copyright (c) 1999, 2001, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
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 *
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 *
 *
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 */
/*
 * Licensed Materials - Property of IBM
 * RMI-IIOP v1.0
 * Copyright IBM Corp. 1998 1999  All Rights Reserved
 *
 */

package javax.rmi.CORBA;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.rmi.RemoteException;
import org.omg.CORBA.ORB;

/**
 * Supports delegation for method implementations in {@link Stub}.
 * A delegate is an instance of a class that implements this
 * interface and provides a replacement implementation for all the
 * methods of <code>javax.rmi.CORBA.Stub</code>.  If delegation is
 * enabled, each stub has an associated delegate.
 *
 * Delegates are enabled by providing the delegate's class name as the
 * value of the
 * <code>javax.rmi.CORBA.StubClass</code>
 * system property.
 *
 * @see Stub
 */
public interface StubDelegate {

    /**
     * Delegation call for {@link Stub#hashCode}.
     */
    int hashCode(Stub self);

    /**
     * Delegation call for {@link Stub#equals}.
     */
    boolean equals(Stub self, java.lang.Object obj);

    /**
     * Delegation call for {@link Stub#toString}.
     */
    String toString(Stub self);

    /**
     * Delegation call for {@link Stub#connect}.
     */
    void connect(Stub self, ORB orb)
        throws RemoteException;

    // _REVISIT_ cannot link to Stub.readObject directly... why not?
    /**
     * Delegation call for
     * <a href="{@docRoot}/serialized-form.html#javax.rmi.CORBA.Stub"><code>Stub.readObject(java.io.ObjectInputStream)</code></a>.
     */
    void readObject(Stub self, ObjectInputStream s)
        throws IOException, ClassNotFoundException;

    // _REVISIT_ cannot link to Stub.writeObject directly... why not?
    /**
     * Delegation call for
     * <a href="{@docRoot}/serialized-form.html#javax.rmi.CORBA.Stub"><code>Stub.writeObject(java.io.ObjectOutputStream)</code></a>.
     */
    void writeObject(Stub self, ObjectOutputStream s)
        throws IOException;

}

⏎ javax/rmi/CORBA/StubDelegate.java

Or download all of them as a single archive file:

File name: jre-rt-javax-1.8.0_191-src.zip
File size: 5381005 bytes
Release date: 2018-10-28
Download 

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

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

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