Here's the test case:
import java.awt.*;
import java.awt.event.ActionListener;
import java.beans.EventHandler;
import javax.swing.*;

public class EventHandlerBug {
     public static void main(String[] args) {
         Object target = new EventHandlerBug();
         JButton b = new JButton("hi");
         ActionListener l = (ActionListener)
EventHandler.create(ActionListener.class, target, "foo",
"source.icon");
         b.addActionListener(l);
         b.doClick();
     }

     public void foo(Icon o) {
         System.out.println("Icon: " + o);
     }
}

When run you get the following NPE:
Exception in thread "main" java.lang.NullPointerException
        at java.beans.EventHandler.invoke(EventHandler.java:354)
        at $Proxy0.actionPerformed(Unknown Source)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1\863)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.ja\va:2183)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonMode\l.java:420)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:25\8)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:282)
        at EventHandlerBug.main(EventHandlerBug.java:14)
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