You may need to add the layer first? There is a chance the getLayers() array is
greater than 0; but that the first entry is null?
On 31/08/2010, at 5:23 PM, Feras Odeh wrote:
> Hello..
>
> I ‘m trying to create selection like tool which highlights the selected
> feature but I got a null pointer exception when the code reaches the setstyle
> point code
>
> if(map.getMapContext().getLayers().length>0){
> map.getMapContext().getLayer(0).setStyle(style);
> // map.getMapPane().repaint();
> }
>
> The exception I got is
>
>
> java.lang.NullPointerException
> at javax.swing.JComponent.repaint(JComponent.java:4748)
> at geotools.MapLayerTable.repaint(MapLayerTable.java:126)
> at org.geotools.swing.JMapPane.layerChanged(JMapPane.java:963)
> at
> org.geotools.map.DefaultMapContext.fireMapLayerListListenerLayerChanged(DefaultMapContext.java:1035)
> at
> org.geotools.map.DefaultMapContext.access$000(DefaultMapContext.java:63)
> at
> org.geotools.map.DefaultMapContext$1.fireAsListEvent(DefaultMapContext.java:101)
> at
> org.geotools.map.DefaultMapContext$1.layerChanged(DefaultMapContext.java:79)
> at
> org.geotools.map.DefaultMapLayer.fireMapLayerListenerLayerChanged(DefaultMapLayer.java:537)
> at org.geotools.map.DefaultMapLayer.setStyle(DefaultMapLayer.java:309)
> at
> geotools.tools.Selection.displaySelectedFeatures(Selection.java:214)
> at geotools.tools.Selection.selectFeatures(Selection.java:189)
> at
> geotools.tools.SpeculationTool.onMouseClicked(SpeculationTool.java:164)
> at
> org.geotools.swing.tool.MapToolManager.mouseClicked(MapToolManager.java:130)
> at
> java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
> at
> java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:252)
> at java.awt.Component.processMouseEvent(Component.java:6266)
> at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
> at java.awt.Component.processEvent(Component.java:6028)
> at java.awt.Container.processEvent(Container.java:2041)
> at java.awt.Component.dispatchEventImpl(Component.java:4630)
> at java.awt.Container.dispatchEventImpl(Container.java:2099)
> at java.awt.Component.dispatchEvent(Component.java:4460)
> at
> java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
> at
> java.awt.LightweightDispatcher.processMouseEvent(Container.java:4247)
> at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
> at java.awt.Container.dispatchEventImpl(Container.java:2085)
> at java.awt.Window.dispatchEventImpl(Window.java:2478)
> at java.awt.Component.dispatchEvent(Component.java:4460)
> at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
> at
> java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
> at
> java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
> at
> java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
> at
> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
> at
> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
> at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
>
>
> So what is the problem with this code?
>
> Thanks
> Feras
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