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 java.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.

⏎ java/beans/beancontext/BeanContextServiceProviderBeanInfo.java

/*
 * Copyright (c) 1998, 1999, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package java.beans.beancontext;

import java.beans.BeanInfo;

/**
 * A BeanContextServiceProvider implementor who wishes to provide explicit
 * information about the services their bean may provide shall implement a
 * BeanInfo class that implements this BeanInfo subinterface and provides
 * explicit information about the methods, properties, events, etc, of their
 * services.
 */

public interface BeanContextServiceProviderBeanInfo extends BeanInfo {

    /**
     * Gets a <code>BeanInfo</code> array, one for each
     * service class or interface statically available
     * from this ServiceProvider.
     * @return the <code>BeanInfo</code> array
     */
    BeanInfo[] getServicesBeanInfo();
}

⏎ java/beans/beancontext/BeanContextServiceProviderBeanInfo.java

Or download all of them as a single archive file:

File name: jre-rt-java-1.8.0_191-src.zip
File size: 6664831 bytes
Release date: 2018-10-28
Download 

⇒ JRE 8 rt.jar - javax.* Package Source Code

⇐ JRE 8 plugin.jar - Java Deploy Control Panel Plugin

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