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/impl/protocol/giopmsgheaders/RequestMessage_1_1.java

/*
 * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.corba.se.impl.protocol.giopmsgheaders;

import org.omg.CORBA.Principal;
import com.sun.corba.se.spi.servicecontext.ServiceContexts;
import com.sun.corba.se.spi.ior.iiop.GIOPVersion;
import com.sun.corba.se.spi.orb.ORB;
import com.sun.corba.se.spi.ior.ObjectKey;

import com.sun.corba.se.spi.logging.CORBALogDomains ;
import com.sun.corba.se.impl.logging.ORBUtilSystemException ;

/**
 * This implements the GIOP 1.1 Request header.
 *
 * @author Ram Jeyaraman 05/14/2000
 */

public final class RequestMessage_1_1 extends Message_1_1
        implements RequestMessage {

    // Instance variables

    private ORB orb = null;
    private ORBUtilSystemException wrapper = null ;
    private ServiceContexts service_contexts = null;
    private int request_id = (int) 0;
    private boolean response_expected = false;
    private byte[] reserved = null; // Added in GIOP 1.1
    private byte[] object_key = null;
    private String operation = null;
    private Principal requesting_principal = null;
    private ObjectKey objectKey = null;

    // Constructors

    RequestMessage_1_1(ORB orb) {
        this.orb = orb;
        this.wrapper = ORBUtilSystemException.get( orb,
            CORBALogDomains.RPC_PROTOCOL ) ;
    }

    RequestMessage_1_1(ORB orb, ServiceContexts _service_contexts,
            int _request_id, boolean _response_expected, byte[] _reserved,
            byte[] _object_key, String _operation,
            Principal _requesting_principal) {
        super(Message.GIOPBigMagic, GIOPVersion.V1_1, FLAG_NO_FRAG_BIG_ENDIAN,
            Message.GIOPRequest, 0);
        this.orb = orb;
        this.wrapper = ORBUtilSystemException.get( orb,
            CORBALogDomains.RPC_PROTOCOL ) ;
        service_contexts = _service_contexts;
        request_id = _request_id;
        response_expected = _response_expected;
        reserved = _reserved;
        object_key = _object_key;
        operation = _operation;
        requesting_principal = _requesting_principal;
    }

    // Accessor methods (RequestMessage interface)

    public ServiceContexts getServiceContexts() {
        return this.service_contexts;
    }

    public int getRequestId() {
        return this.request_id;
    }

    public boolean isResponseExpected() {
        return this.response_expected;
    }

    public byte[] getReserved() {
        return this.reserved;
    }

    public ObjectKey getObjectKey() {
        if (this.objectKey == null) {
            // this will raise a MARSHAL exception upon errors.
            this.objectKey = MessageBase.extractObjectKey(object_key, orb);
        }

        return this.objectKey;
    }

    public String getOperation() {
        return this.operation;
    }

    public Principal getPrincipal() {
        return this.requesting_principal;
    }

    // IO methods

    public void read(org.omg.CORBA.portable.InputStream istream) {
        super.read(istream);
        this.service_contexts
            = new ServiceContexts((org.omg.CORBA_2_3.portable.InputStream) istream);
        this.request_id = istream.read_ulong();
        this.response_expected = istream.read_boolean();
        this.reserved = new byte[3];
        for (int _o0 = 0;_o0 < (3); ++_o0) {
            this.reserved[_o0] = istream.read_octet();
        }
        int _len1 = istream.read_long();
        this.object_key = new byte[_len1];
        istream.read_octet_array(this.object_key, 0, _len1);
        this.operation = istream.read_string();
        this.requesting_principal = istream.read_Principal();
    }

    public void write(org.omg.CORBA.portable.OutputStream ostream) {
        super.write(ostream);
        if (this.service_contexts != null) {
                service_contexts.write(
                (org.omg.CORBA_2_3.portable.OutputStream) ostream,
                GIOPVersion.V1_1);
            } else {
                ServiceContexts.writeNullServiceContext(
                (org.omg.CORBA_2_3.portable.OutputStream) ostream);
        }
        ostream.write_ulong(this.request_id);
        ostream.write_boolean(this.response_expected);
        nullCheck(this.reserved);
        if (this.reserved.length != (3)) {
            throw wrapper.badReservedLength(
                org.omg.CORBA.CompletionStatus.COMPLETED_MAYBE);
        }
        for (int _i0 = 0;_i0 < (3); ++_i0) {
            ostream.write_octet(this.reserved[_i0]);
        }
        nullCheck(this.object_key);
        ostream.write_long(this.object_key.length);
        ostream.write_octet_array(this.object_key, 0, this.object_key.length);
        ostream.write_string(this.operation);
        if (this.requesting_principal != null) {
            ostream.write_Principal(this.requesting_principal);
        } else {
            ostream.write_long(0);
        }
    }

    public void callback(MessageHandler handler)
        throws java.io.IOException
    {
        handler.handleInput(this);
    }
} // class RequestMessage_1_1

⏎ com/sun/corba/se/impl/protocol/giopmsgheaders/RequestMessage_1_1.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
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