[Gvsig_desarrolladores] Error al ejecutar Geoproceso

[raisel]

Hola a todos

Estoy tratando de ejecutar un geoproceso utilizando la clase
BufferGeoprocess de gvSIG pero me esta saliendo este error y no se por que:

java.lang.NullPointerException
	at
com.iver.cit.gvsig.fmap.operations.strategies.DefaultStrategy.process(DefaultStrategy.java:393)
	at
com.iver.cit.gvsig.geoprocess.impl.buffer.fmap.BufferGeoprocess.computeOnlyBuffers(BufferGeoprocess.java:360)
	at
com.iver.cit.gvsig.geoprocess.impl.buffer.fmap.BufferGeoprocess.access$8(BufferGeoprocess.java:350)
	at
com.iver.cit.gvsig.geoprocess.impl.buffer.fmap.BufferGeoprocess$1.run(BufferGeoprocess.java:607)
	at
com.iver.cit.gvsig.geoprocess.impl.buffer.fmap.BufferGeoprocess.process(BufferGeoprocess.java:303)

Este es mi código, espero puedan ayudarme; y gracias de antemano:

com.iver.andami.ui.mdiManager.IWindow view =
PluginServices.getMDIManager().getActiveWindow();

		if(view instanceof View)
		{
		View vista=(View)view;
		MapControl mapCtrl = vista.getMapControl();
		CargadorCapas cargador = new CargadorCapas();

		FLyrVect capa = cargador.cargarTabla("a_hidlineal", "Hidrografia", 0,
mapCtrl, vista, 
"jdbc:postgresql://localhost:5432/Baracoa","postgres","postgres");

		FLyrVect inputLayer = null;
		try{
		inputLayer = (FLyrVect)capa.cloneLayer();
		inputLayer.setName("HidrografiaGEOP");
		
		File outputFile = new File("buffer.shp");
		BufferGeoprocess geoprocess = new BufferGeoprocess(inputLayer);
		
		HashMap<String, Object> params = new HashMap<String, Object>();
		params.put("layer_selection", new Boolean(false));
		params.put("dissolve_buffers", new Boolean(false));
		params.put("buffer_distance", new Double(1000));
		params.put("strategy_flag", new
Byte(BufferGeoprocess.ATTRIBUTE_DISTANCE_STRATEGY));
		params.put("numRings", new Integer(1));
		params.put("typePolBuffer", new Byte(BufferVisitor.BUFFER_OUTSIDE_POLY));
		params.put("cap", new Byte(BufferVisitor.CAP_SQUARE));
		params.put("projection", capa.getProjection());
		params.put("distanceunits", new Integer(100));
		params.put("mapunits", new Integer(100));
		params.put("attr_name", "cantidadcontaminate");
		geoprocess.setParameters(params);
		
		SHPLayerDefinition definition = (SHPLayerDefinition)
geoprocess.createLayerDefinition();
		definition.setFile(outputFile);
		ShpSchemaManager schemaManager = new
ShpSchemaManager(outputFile.getAbsolutePath());
		IWriter writer = null;
		int shapeType = definition.getShapeType();
		if(shapeType != XTypes.MULTI){
		 writer = new ShpWriter();
		 ((ShpWriter) writer).setFile(definition.getFile());
		 writer.initialize(definition);
		}
		else{
		writer = new MultiShpWriter();
		((MultiShpWriter) writer).setFile(definition.getFile());
		writer.initialize(definition);
		}
		geoprocess.setResultLayerProperties(writer, schemaManager);

		geoprocess.checkPreconditions();
		System.out.println("Inicio geoproceso....");
		geoprocess.process();
		System.out.println("Fin geoproceso");

		}catch (Exception e) {
		  e.printStackTrace();	
		}

		//mostramos las capas
		if (inputLayer!= null) {
		 inputLayer.setVisible(true);
		 vista.getMapControl().getMapContext().beginAtomicEvent();
		 vista.getMapControl().getMapContext().getLayers().addLayer(inputLayer);
		 vista.getMapControl().getMapContext().endAtomicEvent();
		}
		}
		else
		 JOptionPane.showMessageDialog(null, "Esto no es una vista");
    }

Saludos, Raisel
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