[udig-users] WMS and no access to XSDs for schema validation

[Riccardo Foschia <riccardo.foschia@xxxxxxxxxxxxx>]

Hello udig-users,

this is probably more a GeoTools problem but it happens with uDig, so I 
ask this list first:

I'm running uDig 2.0.0 on a machine without internet access.

Unfortunately I cannot add a WMS layer to a uDig map from a WMS server 
in the same LAN as the machine running uDig. In the status bar uDig 
complains it cannot connect to the WMS because of

"Error downloading 
http://schemas.opengis.net/sld/1.1.0/sld_capabilities.xsd";

I'm suspecting that uDig or better GeoTools tries to access some of the 
URLs to the XSD referenced in the XML file returned by the 
GetCapabilities request to the local WMS. For your information: these 
are the first lines of the GetCapablities response:

<?xml version='1.0' encoding="UTF-8" standalone="no" ?>
<WMS_Capabilities version="1.3.0"  xmlns="http://www.opengis.net/wms"; 
xmlns:sld="http://www.opengis.net/sld"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xmlns:ms="http://mapserver.gis.umn.edu/mapserver"; 
xsi:schemaLocation="http://www.opengis.net/wms 
http://schemas.opengis.net/wms/1.3.0/capabilities_1_3_0.xsd 
http://www.opengis.net/sld 
http://schemas.opengis.net/sld/1.1.0/sld_capabilities.xsd 
http://mapserver.gis.umn.edu/mapserver";>


I did some research and it seems to me that GeoTools should by default 
not access the internet when parsing GetCapabilities responses if some 
JARs (gt-xsd-*.jar and net.opengis.*.jar) are distributed with an 
application, see chapter "GeoToolsExtensions / XML" here

https://docs.geotools.org/latest/userguide/welcome/architecture.html

I checked that the GeoTools JARs mentioned in the above document are 
distributed with uDig 2.0.0. They are also listed in bundle classpath of 
org.locationtech.udig.libs plugin.

It would be OK for me, if no validation at all would happen for the used 
WMS. So my question is:

Is there a way to configure uDig that no schema validation happens for 
responses to WMS requests?

Any hints are really appreciated.

Thanks in advance,
Riccardo

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