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ポイントのジオメトリを取得し、このジオメトリ「bornes」の行が選択されると色を変更する形状に基づいてグラフィックを描画しようとしています。問題は、行を選択するたびにこのエラーが発生することです。ログ ファイルは次のとおりです。あらかじめ

     Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.vividsolutions.jump.workbench.ui.renderer.java2D.Java2DConverter.toShape(Java2DConverter.java:313)
at com.vividsolutions.jump.workbench.ui.plugin.specific.SearchPropertiesPlugin$2.valueChanged(SearchPropertiesPlugin.java:144)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:147)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:194)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:388)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:398)
at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:442)
at javax.swing.JTable.changeSelectionModel(JTable.java:2352)
at javax.swing.JTable.changeSelection(JTable.java:2421)
at javax.swing.plaf.basic.BasicTableUI$Handler.adjustSelection(BasicTableUI.java:1085)
at javax.swing.plaf.basic.BasicTableUI$Handler.mousePressed(BasicTableUI.java:1008)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:263)
at java.awt.Component.processMouseEvent(Component.java:6294)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
at java.awt.Component.processEvent(Component.java:6062)
at java.awt.Container.processEvent(Container.java:2039)
at java.awt.Component.dispatchEventImpl(Component.java:4660)
at java.awt.Container.dispatchEventImpl(Container.java:2097)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4233)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
at java.awt.Container.dispatchEventImpl(Container.java:2083)
at java.awt.Window.dispatchEventImpl(Window.java:2489)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:668)
at java.awt.EventQueue.access$400(EventQueue.java:81)
at java.awt.EventQueue$2.run(EventQueue.java:627)
at java.awt.EventQueue$2.run(EventQueue.java:625)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:641)
at java.awt.EventQueue$3.run(EventQueue.java:639)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:638)
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)

これは、このエラーに関連するコード行です。これは、bornes (名前、X、Y) を含むbornesTable のリスナーで発生します。

     searchProperties.getBornesTable().getSelectionModel().addListSelectionListener(new ListSelectionListener(){

    @Override
    public void valueChanged(ListSelectionEvent e) {

        try {

            if (search()!= null){
        // here's the line 144 in toShape() method      
            final Shape shape = context.getLayerViewPanel().getViewport().getJava2DConverter().toShape(selectedBornes());
            Color color = Color.yellow;
            Stroke stroke =new BasicStroke(5, BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
            final Graphics2D graphics = (Graphics2D) context.getLayerViewPanel().getGraphics();
            graphics.setColor(color);
            //graphics.setXORMode(Color.white);
            graphics.setStroke(stroke);
            graphics.fill(shape);

            }
            else
                  JOptionPane.showMessageDialog(null, "vous n'avez pas selectionner une bornes " );

        } catch (NoninvertibleTransformException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }




    }

   });

メソッドは次のとおりです: selectedBornes()

   public Geometry selectedBornes() {

    if (getSelectedRowIndex()> 0)
    {
     Geometry geometry;
     geometry = searchBorne().get(getSelectedRowIndex()).getGeometry();
     return geometry;
    }
    return null;

}

メソッド serchBornes() には問題はありませんが、投稿します

   private List<BasicFeature> searchBorne() {

    final List<BasicFeature> basicFeatureBornes = new ArrayList<BasicFeature>();

     for(BasicFeature basicFeature : BornesList) {

                if ( searchProperties.getNumTextField().getText().equals(basicFeature.getString("num")) &&
                        searchProperties.getComplementComboBox().getSelectedItem().equals(basicFeature.getString("complement")))
                    basicFeatureBornes.add(basicFeature);


                    }
     return basicFeatureBornes;

}

メソッド getSelectedRowIndex() もこれに問題はありませんが、投稿します

    public int getSelectedRowIndex() {

    int row = 0;
     for(int i = 0; i < searchBorne().size() ; i++ ) {

          row = searchProperties.getBornesTable().getSelectedRow();

     }

    return row;

}
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2 に答える 2

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final Shape shape = context.getLayerViewPanel().getViewport().getJava2DConverter().toShape(selectedBornes());

selectedBornes()ここでは、値をtoShapeメソッドに直接渡しますが、RowIndexが選択されていないselectedBornes()場合に取得される結果として、値がnullであるかどうかを確認しなかったため、コードを次のように変更します。NullPointerException

Goemetry newGometry=selectedBornes();
if (newGometry !=null){
final Shape shape = context.getLayerViewPanel().getViewport().getJava2DConverter().toShape(newGometry);
}
于 2013-03-11T12:29:42.793 に答える
2 
public Geometry selectedBornes() {
    if (getSelectedRowIndex()> 0)
    {
     Geometry geometry;
     geometry = searchBorne().get(getSelectedRowIndex()).getGeometry();
     return geometry;
    }

選択したインデックスが 0 (最初の要素) の場合はどうなりますか? null を返し、メソッドがクラッシュします。何も選択されていない場合にケースを処理するチェックを追加します。

于 2013-03-11T12:03:14.177 に答える