The website encountered an error while retrieving http://www.mysite.com/dashboard/add-item.xhtml

Question

One user of the app I currently work got the following response in his browser:

The website encountered an error while retrieving http://www.mysite.com/dashboard/add-item.xhtml. It may be down for maintenance or configured incorrectly.

/dashboard/add-item.xhtml is a JSF page that works without problems most of the time.
Why did TomEE show this page? I have set a special error page in web.xml, so this shouldn't have been shown. Application stage is Production as well.

<error-page>
    <error-code>404</error-code>
    <location>/errors/404.xhtml</location>
</error-page>
<error-page>
    <location>/errors/general.xhtml</location>
</error-page>

For all other errors, /errors/general.xhtml is rendered as a response, but not in the case I mentioned. I don't have enough information to reproduce the error, but I'm surprised by the result.

Any ideas for fixing/preventing this?

I am using Apache TomEE 1.6.0-2013.09.20 dev + MyFaces that comes with it (2.1.12).

Answer 1

I'm not sure, but because this error happened just once, and because DigitalOcean was doing maintenance in their datacenter in that day, I assume it was not something related to my application nor to Tomee, but just because of the VPS provider, DigitalOcean in this case.