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/spi/monitoring/MonitoringManagerFactory.java

/*
 * Copyright (c) 2003, 2012, 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.spi.monitoring;

/**
 * <p>
 *
 * @author Hemanth Puttaswamy
 * </p>
 * <p>
 * MonitoringObjectFactory is used internally by the ORB, It is not for
 * general public use.
 * </p>
 */
public interface MonitoringManagerFactory {
    /**
     *  A Simple Factory Method to create the Monitored Attribute Info.
     */
    MonitoringManager createMonitoringManager( String nameOfTheRoot,
        String description );

    void remove(String nameOfTheRoot);
}

⏎ com/sun/corba/se/spi/monitoring/MonitoringManagerFactory.java

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