If you shift-click in a table that has no selection it throws the following exception:

Exception occurred during event dispatching:
java.lang.IndexOutOfBoundsException: -1
        at java.util.BitSet.get(BitSet.java)
        at javax.swing.DefaultListSelectionModel.setLeadSelectionIndex(DefaultListSelectionModel.java:558)
        at javax.swing.plaf.basic.BasicTableUI.updateSelectionModel(BasicTableUI.java:874)
        at javax.swing.plaf.basic.BasicTableUI.updateSelection(BasicTableUI.java:890)
        at javax.swing.plaf.basic.BasicTableUI.access$0(BasicTableUI.java:878)
        at javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.mousePressed(BasicTableUI.java:332)
        at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:226)
        at java.awt.Component.processMouseEvent(Component.java:2401)
        at java.awt.Component.processEvent(Component.java:2249)
        at java.awt.Container.processEvent(Container.java:878)
        at java.awt.Component.dispatchEventImpl(Component.java:1781)
        at java.awt.Container.dispatchEventImpl(Container.java:923)
        at java.awt.Component.dispatchEvent(Component.java:1708)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:1559)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:1459)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1395)
        at java.awt.Container.dispatchEventImpl(Container.java:910)
        at java.awt.Window.dispatchEventImpl(Window.java:492)
        at java.awt.Component.dispatchEvent(Component.java:1708)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:81)

I discussed this with Phil, and we thougt it would be reasonable if, in the case where there is no selection, a shift-click acted like a normal click.