Index: src/main/java/javax/servlet/ServletContext.java
===================================================================
--- src/main/java/javax/servlet/ServletContext.java	(revision 64437)
+++ src/main/java/javax/servlet/ServletContext.java	(working copy)
@@ -117,6 +117,19 @@
     public static final String ORDERED_LIBS =
         "javax.servlet.context.orderedLibs";
 
+    /**
+     * <p>If this constant is used as the value of the {@code className}
+     * argument to {@link #addServlet(java.lang.String, java.lang.String)}, the
+     * container must take the necessary actions to have this servlet perform
+     * equivalently to a {@code &lt;servlet /&gt}; with a {@code &lt;jsp-file /&gt};
+     * instead of a {@code &lt;servlet-class /&gt};.  Note, this assumes a
+     * resolvable JSP file will have been set with a call to
+     * {@link javax.servlet.ServletRegistration.Dynamic}.setJspFile(), before the
+     * context for this web-app has been initialized.</p>
+     *
+     * @since 4.0
+     */
+    public static final String JSP_SERVLET_CLASS_REFERENCE = "javax.servlet.jsp.JspServlet";
 
     /**
      * Returns the context path of the web application.
Index: src/main/java/javax/servlet/ServletRegistration.java
===================================================================
--- src/main/java/javax/servlet/ServletRegistration.java	(revision 64437)
+++ src/main/java/javax/servlet/ServletRegistration.java	(working copy)
@@ -101,6 +101,19 @@
     interface Dynamic extends ServletRegistration, Registration.Dynamic {
 
         /**
+         * <p>Allow programmatic configuration of the JSP file for this
+         * {@link Servlet}.</p>
+         *
+         * @param jspFile The context root relative path to the JSP file that is
+         * to be compiled as this {@link Servlet}.
+         *
+         * @since 4.0
+         */
+
+        default public void setJspFile(String jspFile) {
+        }
+
+        /**
          * Sets the <code>loadOnStartup</code> priority on the Servlet
          * represented by this dynamic ServletRegistration.
          *