Eclipse we-app Error using google cloud - eclipse

Question

Eclipse is returning a couple of quite frustrating errors.
attribute xmlns must be declared for element type web-app
attribute version must be declared for element type web-app
This is the source code for web.xml
I got it from following the instructions from this site.
https://cloud.google.com/appengine/docs/java/gettingstarted/ui_and_code
Here is also the code...
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE web-app PUBLIC
"-//Oracle Corporation//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5">
<servlet>
<servlet-name>guestbook</servlet-name>
<servlet-class>com.example.guestbook.GuestbookServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>guestbook</servlet-name>
<url-pattern>/guestbook</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>guestbook.jsp</welcome-file>
</welcome-file-list>
</web-app>
The errors occur on line 5. I'm not sure s to how to fix this problem. Any input would be greatly appreciated.

Answer 1

You can replace the first 5 lines with this:
<?xml version="1.0" ?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
But your app will probably run properly anyway, so you can also disable that Eclipse warning.