Hi,
I found out that uDig fails to render a wfs layer from mapserver if it was
empty when creating the layer. I have some mapserver layers taking the features
from database tables, and when a table does not contain any features, then the
layer is not correctly created and it cannot be render, throwing the following
error:
net.refractions.udig.project.render.RenderException: class
java.lang.NullPointerException occured during rendering: null
at
net.refractions.udig.render.internal.feature.basic.BasicFeatureRenderer.render(BasicFeatureRenderer.java:368)
at
net.refractions.udig.render.internal.feature.basic.BasicFeatureRenderer.render(BasicFeatureRenderer.java:222)
at
net.refractions.udig.project.internal.render.impl.RenderJob.startRendering(RenderJob.java:108)
at
net.refractions.udig.project.internal.render.impl.RenderJob.run(RenderJob.java:213)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: java.lang.NullPointerException
at com.vividsolutions.jts.geom.Envelope.init(Envelope.java:254)
at com.vividsolutions.jts.geom.Envelope.<init>(Envelope.java:186)
at
org.geotools.geometry.jts.ReferencedEnvelope.<init>(ReferencedEnvelope.java:246)
at
org.geotools.data.wfs.v1_0_0.WFS_1_0_0_DataStore.getBounds(WFS_1_0_0_DataStore.java:829)
at
org.geotools.data.wfs.v1_0_0.WFSFeatureSource.getBounds(WFSFeatureSource.java:198)
at
org.geotools.data.wfs.v1_0_0.WFSFeatureSource.getBounds(WFSFeatureSource.java:191)
at org.geotools.map.FeatureLayer.getBounds(FeatureLayer.java:166)
at org.geotools.map.MapContext.getLayerBounds(MapContext.java:463)
at
org.geotools.map.DefaultMapContext.getViewport(DefaultMapContext.java:524)
at org.geotools.map.MapContent.<init>(MapContent.java:207)
at org.geotools.map.MapContext.<init>(MapContext.java:170)
at org.geotools.map.DefaultMapContext.<init>(DefaultMapContext.java:98)
at
net.refractions.udig.render.internal.feature.basic.BasicFeatureRenderer.prepareDraw(BasicFeatureRenderer.java:166)
at
net.refractions.udig.render.internal.feature.basic.BasicFeatureRenderer.render(BasicFeatureRenderer.java:245)
... 4 more
and the following message in the status bar , "Coordinate Reference System of
data is unknown. Unexpected behaviour may result if it is not set".
So I set programatically the CRS by using:
layer.setCRS(DefaultGeographicCRS.WGS84);
And then the message changes to "A problem ourred during rendering. Try a
refresh or zoom to the layer to see if problem will fix itself"
My guess is that udig builds the layer obtaining the layer information from one
of its features, and there arent any, so I tried to set the parameters
programatically
layer.setBounds(new ReferencedEnvelope(new Envelope (-180, 180, -90, 90),
DefaultGeographicCRS.WGS84));
But it is still not enough. is this issue familiar to you? do you know what
layer parameters I would have to set programaticallly so the layer is able to
render?
Thanks,
Joaquín
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