According to the spec for javax.swing.plaf.metal.MetalToolBarUI the method
update(Graphics, JComponent) should throw NPE if any of the arguments are null.
However if we invoke update() with null Graphics argument then NPE is not
thrown.
You can reproduce it by following code:

import javax.swing.JComponent;
import javax.swing.plaf.metal.MetalToolBarUI;

public class Test {
     public static void main(String[] args) {
        JComponent jComp = new JComponent(){};
        MetalToolBarUI toolBarUI = new MetalToolBarUI();
        toolBarUI.update(null, jComp);
        System.out.println("OK");
    }
}

It prints OK instead of throwing NPE.




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