[Geotools-gt2-users] WMS Error transforming bbox

[Davis F. <dav...@gm...>]

Hi,

We implemented our own test datastore in geotools, and are trying to
make it work via WMS using GeoServer.  WFS seems to work without a
hitch using GeoServer.

Using WMS -- however..the following query:

http://localhost:8080/geoserver/wms?version=3D1.3.0&request=3DGetMap&layers=
=3Dteleatlas:RoadElement&BBOX=3D5.7,49.4,6.5,50.1&srs=3DEPSG:4326&width=3D3=
00&height=3D300&format=3Dimage/gif&STYLES=3Dsimple_road

produces a blank map image, and eclipse debugger reports the following:

[SEVERE] org.geotools.renderer.lite.StreamingRenderer$DefaultRenderListener
- Error transforming bbox
[SEVERE] org.geotools.renderer.lite.StreamingRenderer$DefaultRenderListener
- Exception rendering layer org.geotools.map.DefaultMapLayer@118317f

Tracing the debugger in eclipse,
org.vfny.geoserver.wms.responses.produceMap() calls:
renderer.paint(graphic, paintArea, at); at line 244 in produceMap()

I did an SVN co on the 2.1.x branch of GeoTools and imported into
eclipse, but my debugger's execution pointer is not correct when I
step into org.geotools.renderer.lite.StreamingRenderer so I'm having
some trouble finding the problem.

It does seem this problem has been experienced by other users before.=20
Is it possible that someone on the list might help explain what may be
going wrong?

The try block where the exception is caught reads:

// Then create the geometry filters. We have to create one for each
                // geometric
                // attribute used during the rendering as the feature
may have more
                // than one
                // and the styles could use non default geometric ones
                CoordinateReferenceSystem sourceCrs =3D
currLayer.getFeatureSource().getSchema()
                .getDefaultGeometry().getCoordinateSystem();

                if (sourceCrs !=3D null && !sourceCrs.equals(destinationCrs=
)) {
                    // get an unprojected envelope since the feature
source is operating on
                    // unprojected geometries
                    transform =3D
operationFactory.createOperation(destinationCrs,sourceCrs).getMathTransform=
();
                    if (transform !=3D null && !transform.isIdentity()) {
                        // Envelope eee=3D  JTS.transform(envelope,
transform);// this is the old way
                        //10 =3D make 10 points on each side of the bbox
& transform the polygon
                        envelope =3D JTS.transform(envelope,
transform,10); // this will usually be a "bigger" bbox
                    } else
                        transform =3D null; //reset transform
                }

                Filter filter =3D null;
                if (!isMemoryPreloadingEnabled()) {
                    BBoxExpression rightBBox =3D
filterFactory.createBBoxExpression(envelope);
                    filter =3D createBBoxFilters(schema, attributes, rightB=
Box);
                } else {
                    filter =3D Filter.NONE;
                }

                // now build the query using only the attributes and
the bounding
                // box needed
                DefaultQuery q =3D new DefaultQuery(schema.getTypeName());
                q.setFilter(filter);
                q.setPropertyNames(attributes);
                query =3D q;

I'm just looking for some helpful pointers on what to try next from
any veterans familiar with this area of the code --

Thx...

Davis