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

⏎ com/sun/corba/se/PortableActivationIDL/ServerAlreadyUninstalledHelper.java

package com.sun.corba.se.PortableActivationIDL;


/**
* com/sun/corba/se/PortableActivationIDL/ServerAlreadyUninstalledHelper.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/com/sun/corba/se/PortableActivationIDL/activation.idl
* Saturday, October 6, 2018 9:30:40 AM PDT
*/

abstract public class ServerAlreadyUninstalledHelper
{
  private static String  _id = "IDL:PortableActivationIDL/ServerAlreadyUninstalled:1.0";

  public static void insert (org.omg.CORBA.Any a, com.sun.corba.se.PortableActivationIDL.ServerAlreadyUninstalled that)
  {
    org.omg.CORBA.portable.OutputStream out = a.create_output_stream ();
    a.type (type ());
    write (out, that);
    a.read_value (out.create_input_stream (), type ());
  }

  public static com.sun.corba.se.PortableActivationIDL.ServerAlreadyUninstalled extract (org.omg.CORBA.Any a)
  {
    return read (a.create_input_stream ());
  }

  private static org.omg.CORBA.TypeCode __typeCode = null;
  private static boolean __active = false;
  synchronized public static org.omg.CORBA.TypeCode type ()
  {
    if (__typeCode == null)
    {
      synchronized (org.omg.CORBA.TypeCode.class)
      {
        if (__typeCode == null)
        {
          if (__active)
          {
            return org.omg.CORBA.ORB.init().create_recursive_tc ( _id );
          }
          __active = true;
          org.omg.CORBA.StructMember[] _members0 = new org.omg.CORBA.StructMember [1];
          org.omg.CORBA.TypeCode _tcOf_members0 = null;
          _tcOf_members0 = org.omg.CORBA.ORB.init ().create_string_tc (0);
          _tcOf_members0 = org.omg.CORBA.ORB.init ().create_alias_tc (org.omg.PortableInterceptor.ServerIdHelper.id (), "ServerId", _tcOf_members0);
          _members0[0] = new org.omg.CORBA.StructMember (
            "serverId",
            _tcOf_members0,
            null);
          __typeCode = org.omg.CORBA.ORB.init ().create_exception_tc (com.sun.corba.se.PortableActivationIDL.ServerAlreadyUninstalledHelper.id (), "ServerAlreadyUninstalled", _members0);
          __active = false;
        }
      }
    }
    return __typeCode;
  }

  public static String id ()
  {
    return _id;
  }

  public static com.sun.corba.se.PortableActivationIDL.ServerAlreadyUninstalled read (org.omg.CORBA.portable.InputStream istream)
  {
    com.sun.corba.se.PortableActivationIDL.ServerAlreadyUninstalled value = new com.sun.corba.se.PortableActivationIDL.ServerAlreadyUninstalled ();
    // read and discard the repository ID
    istream.read_string ();
    value.serverId = istream.read_string ();
    return value;
  }

  public static void write (org.omg.CORBA.portable.OutputStream ostream, com.sun.corba.se.PortableActivationIDL.ServerAlreadyUninstalled value)
  {
    // write the repository ID
    ostream.write_string (id ());
    ostream.write_string (value.serverId);
  }

}

⏎ com/sun/corba/se/PortableActivationIDL/ServerAlreadyUninstalledHelper.java

Or download all of them as a single archive file:

File name: jre-rt-com-1.8.0_191-src.zip
File size: 8099783 bytes
Release date: 2018-10-28
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