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

⏎ javax/lang/model/UnknownEntityException.java

/*
 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javax.lang.model;

/**
 * Superclass of exceptions which indicate that an unknown kind of
 * entity was encountered.  This situation can occur if the language
 * evolves and new kinds of constructs are introduced.  Subclasses of
 * this exception may be thrown by visitors to indicate that the
 * visitor was created for a prior version of the language.
 *
 * <p>A common superclass for those exceptions allows a single catch
 * block to have code handling them uniformly.
 *
 * @author Joseph D. Darcy
 * @see javax.lang.model.element.UnknownElementException
 * @see javax.lang.model.element.UnknownAnnotationValueException
 * @see javax.lang.model.type.UnknownTypeException
 * @since 1.7
 */
public class UnknownEntityException extends RuntimeException {

    private static final long serialVersionUID = 269L;

    /**
     * Creates a new {@code UnknownEntityException} with the specified
     * detail message.
     *
     * @param message the detail message
     */
    protected UnknownEntityException(String message) {
        super(message);
    }
}

⏎ javax/lang/model/UnknownEntityException.java

Or download all of them as a single archive file:

File name: jre-rt-javax-1.8.0_191-src.zip
File size: 5381005 bytes
Release date: 2018-10-28
Download 

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

⇐ JRE 8 rt.jar - java.* Package Source Code

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