Compatibility with OpenPDF as alternative to iText 2.1.7

Issue: SPR-16107

(cherry picked from commit 9efdadc)

Author: jhoeller

spring-webmvc/src/main/java/org/springframework/web/servlet/view/document/AbstractPdfStamperView.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,6 +32,11 @@
  * document with an AcroForm. Application-specific view classes
  * will extend this class to merge the PDF form with model data.
  *
+ * <p>This view implementation uses Bruno Lowagie's
+ * <a href="http://www.lowagie.com/iText">iText</a> package.
+ * Known to work with iText 2.1.7 as well as its fork
+ * <a href="https://github.com/LibrePDF/OpenPDF">OpenPDF</a>.
+ *
  * <p>Thanks to Bryant Larsen for the suggestion and the original prototype!
  *
  * @author Juergen Hoeller

spring-webmvc/src/main/java/org/springframework/web/servlet/view/document/AbstractPdfView.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,13 +30,17 @@
 import org.springframework.web.servlet.view.AbstractView;
 
 /**
- * Abstract superclass for PDF views, using Bruno Lowagie's
+ * Abstract superclass for PDF views. Application-specific view classes
+ * will extend this class. The view will be held in the subclass itself,
+ * not in a template.
+ *
+ * <p>This view implementation uses Bruno Lowagie's
  * <a href="http://www.lowagie.com/iText">iText</a> package.
- * Application-specific view classes will extend this class.
- * The view will be held in the subclass itself, not in a template.
+ * Known to work with iText 2.1.7 as well as its fork
+ * <a href="https://github.com/LibrePDF/OpenPDF">OpenPDF</a>.
  *
- * <p>Note: Internet Explorer requires a ".pdf" extension, as
- * it doesn't always respect the declared content type.
+ * <p>Note: Internet Explorer requires a ".pdf" extension, as it doesn't
+ * always respect the declared content type.
  *
  * @author Rod Johnson
  * @author Juergen Hoeller