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

[Frank Gasdorf <fgdrf@xxxxxxxxxxxxxxxxxxxxx>]

Hi Ricardo,

welcome to the users-list and thanks for your post! 

Have I understood you correctly, the added WMS Server/Layer has not been added to the Map/Catalog due to this validation error? Maybe this error is just logged but ignored at  the end.

I found a similar report on Stackoverflow (https://stackoverflow.com/questions/29073622/geotools-wms-module-error).

Then I found a GeoTools - FAQ entry : https://docs.geotools.org/latest/userguide/faq.html#q-i-am-in-a-restricted-environment-how-to-configure-schemalocator

Would you please create an issue at github (https://github.com/locationtech/udig-platform/issues) so we can dig into uDig and find a way to solve it. I guess it needs more investigation..

Many thanks in advance

--

Frank

Am Mo., 5. Okt. 2020 um 15:48 Uhr schrieb 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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