Hi Jody, hi list, Thanks for the answer. I indeed did not use a command to make this change. However the error still appears; debugging session ahead :)
stan On 2010 Sep 21, at 22:33, Jody Garnett wrote: > I think you have probably just found a bug; since I don't myself have the > problem I will need to ask you to spend some time in the debugger to see what > is going on and create a patch. > > I am going to guess that the renderer is still trying to draw as the map is > changed; we probably need to stop the renderer and then change the map? > > I am going to just confirm that you are using a command to make this change > (a command is like a small runnable that you pass to the map; it will run the > command to update the internal state in a threadsafe manner; this is how we > avoid changing the state of the map while the renderer or other code is > making use of it). > > Specifically calling any internal methods should be done only from inside a > command. > > Jody > > On 21/09/2010, at 11:59 PM, Stanislas Nanchen wrote: > >> Hello everyone, >> >> At my company, we have embedded uDig for our map displaying purposes and I >> have the following problem with the MapViewer >> when setting a map for the second time via the method setMap. >> >> In setMap, if an old map is present, its renderManager is kind of 'disposed' >> with the following two lines of code: >> >> (in MapViewer) >> 170 renderManager.setMapInternal( null ); >> 171 renderManager.setMapDisplay(null); >> >> In certain circumstances, unfortunately unclear, the old renderManagner >> tries to refresh an image. This fails with an NPE in the following >> line as its MapDisplay is null. >> >> (in CompositeRendererImpl.java) >> 377 Dimension displaySize = >> getContext().getMapDisplay().getDisplaySize(); >> >> the stack trace is the following: >> >> java.lang.NullPointerException >> at >> net.refractions.udig.project.internal.render.impl.CompositeRendererImpl.refreshImage(CompositeRendererImpl.java:377) >> at >> net.refractions.udig.project.internal.render.impl.CompositeRendererImpl.refreshImage(CompositeRendererImpl.java:296) >> at >> net.refractions.udig.project.internal.render.impl.RenderExecutorComposite$CompositeRendererJob.incrementalUpdate(RenderExecutorComposite.java:119) >> at >> net.refractions.udig.project.internal.render.impl.RenderExecutorComposite$CompositeRendererJob.startRendering(RenderExecutorComposite.java:166) >> at >> net.refractions.udig.project.internal.render.impl.RenderJob.run(RenderJob.java:213) >> at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) >> >> The problem is quite puzzling as this NPE is not raised systematically. >> Should I take any special precaution when setting a map to a MapViewer for >> the second time in order to avoid this error? >> >> Thank you for your help. >> Stanislas Nanchen. >> _______________________________________________ >> User-friendly Desktop Internet GIS (uDig) >> http://udig.refractions.net >> http://lists.refractions.net/mailman/listinfo/udig-devel > > _______________________________________________ > User-friendly Desktop Internet GIS (uDig) > http://udig.refractions.net > http://lists.refractions.net/mailman/listinfo/udig-devel _______________________________________________ User-friendly Desktop Internet GIS (uDig) http://udig.refractions.net http://lists.refractions.net/mailman/listinfo/udig-devel
