[Geotools-devel] legend problem with MapLegendViewer demo on Mac OS X

[Jon C. <jc...@cw...>]

When I attempt to run the MapLegendViewer demo 
(geotools2-B3/geotools-demo) on Mac OS X,  I  encounter the following 
error message:

java.lang.NullPointerException
        at 
org.geotools.gui.swing.legend.LegendTreeLayerCellRenderer.setBackground(LegendTreeLayerCellRenderer.java:108)
        at javax.swing.LookAndFeel.installColors(LookAndFeel.java:58)
        at javax.swing.LookAndFeel.installColorsAndFont(LookAndFeel.java:92)
        at apple.laf.AquaPanelUI.installDefaults(AquaPanelUI.java:46)
        at apple.laf.AquaPanelUI.installUI(AquaPanelUI.java:35)
        at javax.swing.JComponent.setUI(JComponent.java:449)
        at javax.swing.JPanel.setUI(JPanel.java:131)
        at javax.swing.JPanel.updateUI(JPanel.java:104)
        at javax.swing.JPanel.<init>(JPanel.java:64)
        at javax.swing.JPanel.<init>(JPanel.java:87)
        at javax.swing.JPanel.<init>(JPanel.java:95)
        at 
org.geotools.gui.swing.legend.LegendTreeLayerCellRenderer.<init>(LegendTreeLayerCellRenderer.java:61)
        at 
org.geotools.gui.swing.legend.LegendTreeCellRendererSwitcher.<init>(LegendTreeCellRendererSwitcher.java:41)
        at org.geotools.gui.swing.Legend.<init>(Legend.java:105)
        at MapLegendViewer.<init>(Unknown Source)
        at MapLegendViewer.main(Unknown Source)

After some investigation, I determined that the 
org.geotools.gui.swing.legend.LegendTreeLayerCellRenderer.setBackground(...) 
method was being called from the parent constructor before 
org.geotools.gui.swing.legend.LegendTreeLayerCellRenderer.initComponents() 
method is called (hence the renderChild array is null).

If I add the test for renderChild == null in 
LegendTreeLayerCellRenderer.setBackground(...) (return if it is null), 
org.geotools.gui.swing.LegendTest fails.

Is there a work around for this problem? A map viewer without a working 
legend is useless.

Jon

-- 
Jon C. Cline, Ph.D.
Research Associate

Department of Biology
Case Western Reserve University
Clapp Hall, Room 308
10900 Euclid Avenue
Cleveland, OH 44106-7080

Email:	jon...@ca...
Phone:	216-368-3561
Fax:	216-368-4672