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/CORBA/DynamicImplementation.java

/*
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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package org.omg.CORBA;

import org.omg.CORBA.portable.ObjectImpl;

/**
 * @deprecated org.omg.CORBA.DynamicImplementation
 */
@Deprecated
public class DynamicImplementation extends org.omg.CORBA.portable.ObjectImpl {

    /**
      * @deprecated Deprecated by Portable Object Adapter
      */
    @Deprecated
    public void invoke(ServerRequest request) {
        throw new org.omg.CORBA.NO_IMPLEMENT();
    }

    public String[] _ids() {
        throw new org.omg.CORBA.NO_IMPLEMENT();
    }
}

⏎ org/omg/CORBA/DynamicImplementation.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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⇑⇑ FAQ for JDK (Java Development Kit)