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/ior/GenericTaggedProfile.java

/*
 * Copyright (c) 2000, 2013, 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.ior;

import org.omg.CORBA_2_3.portable.InputStream ;

import com.sun.corba.se.spi.ior.TaggedProfile ;
import com.sun.corba.se.spi.ior.TaggedProfileTemplate ;
import com.sun.corba.se.spi.ior.ObjectId ;
import com.sun.corba.se.spi.ior.ObjectKeyTemplate ;
import com.sun.corba.se.spi.ior.ObjectKey ;

import com.sun.corba.se.spi.orb.ORB ;

import com.sun.corba.se.spi.ior.iiop.GIOPVersion ;

import com.sun.corba.se.impl.encoding.EncapsOutputStream ;

/**
 * @author
 */
public class GenericTaggedProfile extends GenericIdentifiable implements TaggedProfile
{
    private ORB orb ;

    public GenericTaggedProfile( int id, InputStream is )
    {
        super( id, is ) ;
        this.orb = (ORB)(is.orb()) ;
    }

    public GenericTaggedProfile( ORB orb, int id, byte[] data )
    {
        super( id, data ) ;
        this.orb = orb ;
    }

    public TaggedProfileTemplate getTaggedProfileTemplate()
    {
        return null ;
    }

    public ObjectId getObjectId()
    {
        return null ;
    }

    public ObjectKeyTemplate getObjectKeyTemplate()
    {
        return null ;
    }

    public ObjectKey getObjectKey()
    {
        return null ;
    }

    public boolean isEquivalent( TaggedProfile prof )
    {
        return equals( prof ) ;
    }

    public void makeImmutable()
    {
        // NO-OP
    }

    public boolean isLocal()
    {
        return false ;
    }

    public org.omg.IOP.TaggedProfile getIOPProfile()
    {
        EncapsOutputStream os =
            sun.corba.OutputStreamFactory.newEncapsOutputStream(orb);
        write( os ) ;
        InputStream is = (InputStream)(os.create_input_stream()) ;
        return org.omg.IOP.TaggedProfileHelper.read( is ) ;
    }
}

⏎ com/sun/corba/se/impl/ior/GenericTaggedProfile.java

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