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/FragmentMessage_1_1.java

/*
 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

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

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

public final class FragmentMessage_1_1 extends Message_1_1
        implements FragmentMessage {

    // Constructors

    FragmentMessage_1_1() {}

    FragmentMessage_1_1(Message_1_1 msg11) {
        this.magic = msg11.magic;
        this.GIOP_version = msg11.GIOP_version;
        this.flags = msg11.flags;
        this.message_type = GIOPFragment;
        this.message_size = 0;
    }

    // Accessor methods

    public int getRequestId() {
        return -1; // 1.1 has no fragment header and so no request_id
    }

    public int getHeaderLength() {
        return GIOPMessageHeaderLength;
    }

    // IO methods

    /* This will never be called, since we do not currently read the
     * request_id from an CDRInputStream. Instead we use the
     * readGIOP_1_1_requestId to read the requestId from a byte buffer.
     */
    public void read(org.omg.CORBA.portable.InputStream istream) {
        super.read(istream);
    }

    /* 1.1 has no request_id; so nothing to write */
    public void write(org.omg.CORBA.portable.OutputStream ostream) {
        super.write(ostream);
    }

    public void callback(MessageHandler handler)
        throws java.io.IOException
    {
        handler.handleInput(this);
    }
} // class FragmentMessage_1_1

⏎ com/sun/corba/se/impl/protocol/giopmsgheaders/FragmentMessage_1_1.java

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