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/annotation/processing/SupportedSourceVersion.java

/*
 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javax.annotation.processing;

import java.lang.annotation.*;
import static java.lang.annotation.RetentionPolicy.*;
import static java.lang.annotation.ElementType.*;
import javax.lang.model.SourceVersion;


/**
 * An annotation used to indicate the latest source version an
 * annotation processor supports.  The {@link
 * Processor#getSupportedSourceVersion} method can construct its
 * result from the value of this annotation, as done by {@link
 * AbstractProcessor#getSupportedSourceVersion}.
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ahé
 * @since 1.6
 */
@Documented
@Target(TYPE)
@Retention(RUNTIME)
public @interface SupportedSourceVersion {
    /**
     * Returns the latest supported source version.
     * @return the latest supported source version
     */
    SourceVersion value();
}

⏎ javax/annotation/processing/SupportedSourceVersion.java

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

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

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