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/portable/InvokeHandler.java

/*
 * Copyright (c) 1998, 1999, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package org.omg.CORBA.portable;

/**
This interface provides a dispatching mechanism for an incoming call.
It is invoked by the ORB to dispatch a request to a servant.
*/

public interface InvokeHandler {
    /**
     * Invoked by the ORB to dispatch a request to the servant.
     *
     * ORB passes the method name, an InputStream containing the
     * marshalled arguments, and a ResponseHandler which the servant
     * uses to construct a proper reply.
     *
     * Only CORBA SystemException may be thrown by this method.
     *
     * The method must return an OutputStream created by the
     * ResponseHandler which contains the marshalled reply.
     *
     * A servant must not retain a reference to the ResponseHandler
     * beyond the lifetime of a method invocation.
     *
     * Servant behaviour is defined as follows:
     * <p>1. Determine correct method, and unmarshal parameters from
     *    InputStream.
     * <p>2. Invoke method implementation.
     * <p>3. If no user exception, create a normal reply using
     *    ResponseHandler.
     * <p>4. If user exception occurred, create exception reply using
     *    ResponseHandler.
     * <p>5. Marshal reply into OutputStream returned by
     *    ResponseHandler.
     * <p>6. Return OutputStream to ORB.
     * <p>
     * @param method The method name.
     * @param input The <code>InputStream</code> containing the marshalled arguments.
     * @param handler The <code>ResponseHandler</code> which the servant uses
     * to construct a proper reply
     * @return The <code>OutputStream</code> created by the
     * ResponseHandler which contains the marshalled reply
     * @throws SystemException is thrown when invocation fails due to a CORBA system exception.
     */

    OutputStream _invoke(String method, InputStream input,
                         ResponseHandler handler)
        throws org.omg.CORBA.SystemException;
}

⏎ org/omg/CORBA/portable/InvokeHandler.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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