Add content type check for GetMapResponse
-----------------------------------------
Key: GEOT-3362
URL: http://jira.codehaus.org/browse/GEOT-3362
Project: GeoTools
Issue Type: Bug
Components: ext wms
Affects Versions: 2.7-M5
Reporter: Ivan Grcic
If GetMapResponse returned from wms server is not readable by ImageIO.read it
returns null, and later on ambiguous error is thrown :
org.geoserver.platform.ServiceException: Error rendering coverage on the fast
path
(attached full stack)
This is can be the case if server returns text/xml document with simple errors,
such as:
<ServiceException code="InvalidSRS(CRS)">Parameter 'srs(crs)' can not be
empty.</ServiceException>
Inside WMSCoverageReader.getMap method we should intercept this, by checking if
content type is readable or/and image is not null, and throw more informative
error.
{quote}
GetMapResponse response = wms.issueRequest(mapRequest);
is = response.getInputStream();
BufferedImage image = ImageIO.read(is);
LOGGER.fine("GetMap completed");
return gcf.create(layers.get(0).getTitle(), image, gridEnvelope);
{quote}
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