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Editorial Team
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Asked: 2026-06-05T18:57:03+00:00

I’m fairly new to servlets so I hope this isn’t an obvious question. So

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I’m fairly new to servlets so I hope this isn’t an obvious question. So I have a simple Java servlet I’ve created in NetBeans using a template. I have a context parameter I created in web.xml that lists allowed hosts (one of my request parameters is a URL which I’ll compare against this list):

<context-param>
    <param-name>allowedHosts</param-name>
    <param-value>
        http://opendap.co-ops.nos.noaa.gov/thredds/wms/NOAA/CBOFS/MODELS/201206/nos.cbofs.fields.nowcast.20120612.t00z.nc?service=WMS&version=1.3.0&request=GetCapabilities
        http://www.google.com
        http://www.facebook.com
    </param-value>
</context-param>

When I put only dummy URLs in like Google and Facebook, this works perfectly. However, when I add the first URL, the Tomcat server cannot even deploy. Looking at my logs, I see this at the top of a very long stacktrace:

SEVERE: Parse Fatal Error at line 19 column 146: The reference to entity "version" must end with the ';' delimiter.
org.xml.sax.SAXParseException: The reference to entity "version" must end with the ';' delimiter.

Line 19 column 146 indeed points to the “version” portion of that long URL I have in the list of context parameters. So obviously “version” is some kind of reserve word. If I remove the “version” parameter from this URL, “request” is also a problem.

I can get around this by doing just http://opendap.co-ops.nos.noaa.gov/thredds/wms/ as the URL (because ultimately I want a list of hosts not specific URLs anyway), but I was wondering what one would have to do to get around this otherwise… Is there a way to include URLs that have such “reserve words” in web.xml?

Thanks!

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1 Answer

  1. Editorial Team

    Just put “&amp;” (without the quotes) instead of the ampersands in your URL.

    Hope this helps – DF

    Edit: Try this:

    <context-param>
<param-name>allowedHosts</param-name>
<param-value>
    http://opendap.co-ops.nos.noaa.gov/thredds/wms/NOAA/CBOFS/MODELS/201206/nos.cbofs.fields.nowcast.20120612.t00z.nc?service=WMS&version=1.3.0&request=GetCapabilities
</param-value>

    Edit2: PS These things are called “entities” in XML – do a Google for more info

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