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/type/NoType.java

/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package javax.lang.model.type;

import javax.lang.model.element.ExecutableElement;


/**
 * A pseudo-type used where no actual type is appropriate.
 * The kinds of {@code NoType} are:
 * <ul>
 * <li>{@link TypeKind#VOID VOID} - corresponds to the keyword {@code void}.
 * <li>{@link TypeKind#PACKAGE PACKAGE} - the pseudo-type of a package element.
 * <li>{@link TypeKind#NONE NONE} - used in other cases
 *   where no actual type is appropriate; for example, the superclass
 *   of {@code java.lang.Object}.
 * </ul>
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ah&eacute;
 * @see ExecutableElement#getReturnType()
 * @since 1.6
 */

public interface NoType extends TypeMirror {
}

⏎ javax/lang/model/type/NoType.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

⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)