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/jmx/remote/util/OrderClassLoaders.java

/*
 * Copyright (c) 2003, 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.jmx.remote.util;

import sun.reflect.misc.ReflectUtil;

public class OrderClassLoaders extends ClassLoader {
    public OrderClassLoaders(ClassLoader cl1, ClassLoader cl2) {
        super(cl1);

        this.cl2 = cl2;
    }

    protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
        ReflectUtil.checkPackageAccess(name);
        try {
            return super.loadClass(name, resolve);
        } catch (ClassNotFoundException cne) {
            if (cl2 != null) {
                return cl2.loadClass(name);
            } else {
                throw cne;
            }
        }
    }

    private ClassLoader cl2;
}

⏎ com/sun/jmx/remote/util/OrderClassLoaders.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
Download 

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