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

⏎ org/omg/IOP/TAG_JAVA_CODEBASE.java

package org.omg.IOP;


/**
* org/omg/IOP/TAG_JAVA_CODEBASE.java .
* Generated by the IDL-to-Java compiler (portable), version "3.2"
* from c:/re/workspace/8-2-build-windows-amd64-cygwin/jdk8u191/11896/corba/src/share/classes/org/omg/PortableInterceptor/IOP.idl
* Saturday, October 6, 2018 9:30:42 AM PDT
*/

public interface TAG_JAVA_CODEBASE
{

  /**
     * Class downloading is supported for stubs, ties, values, and 
     * value helpers. The specification allows transmission of codebase 
     * information on the wire for stubs and ties, and enables usage of 
     * pre-existing ClassLoaders when relevant.  
     * <p>
     * For values and value helpers, the codebase is transmitted after the 
     * value tag.  For stubs and ties, the codebase is transmitted as 
     * the TaggedComponent <code>TAG_JAVA_CODEBASE</code> in the IOR 
     * profile, where the <code>component_data</code> is a CDR encapsulation 
     * of the codebase written as an IDL string. The codebase is a 
     * space-separated list of one or more URLs.
     */
  public static final int value = (int)(25L);
}

⏎ org/omg/IOP/TAG_JAVA_CODEBASE.java

Or download all of them as a single archive file:

File name: jre-rt-org-1.8.0_191-src.zip
File size: 951125 bytes
Release date: 2018-10-28
Download 

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

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

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