[udig-devel] AddLayerCommand

["James Anderson" <jamesanderson274@xxxxxxxxxxx>]

I've spent the past four days attempting to add a layer through using a 
customised plug-in icon.  However every time I've tried I've kept getting a 
null pointer exception from the new layer that I've been attempting to add.

The actual code that adds the layer can be found on the Internet called 
AddLayerCommand, however, I've been calling it from another class with the 
extension AbstractCommand that enables the customised plug-in icon to 
trigger an event, within this class my run method contains the following 
code:

   IMap map;
   map.sendCommandASync(new AddLayerCommand(layer) );

However, the map variable has not been initialised so when the user clicks 
the button nothing happens.  If I add the following code to my run method:

  IMap map = ApplicationGIS.getActiveMap();
  map.sendCommandASync(new AddLayerCommand(layer) );

When the user clicks on the icon it triggers an event, however, it displays 
the following error message:

  An internal error occurred during: "Map command executing"

It's obvious I'm initialising the map variable incorrectly but if anyone 
knows how to initialise the variable correctly then please reply to this 
email as soon as possible.  I'll keep looking over the Internet for an 
answer myself while I wait for a reply.

James.

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