api/javax_swing/JScrollPane/indexTGF.html#UpdateUI failed with MotifLookAndFeel on all platform

Please see the following code:

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import javax.swing.*;
import static java.lang.System.err;

public class UpUI {

    public static void main(String[] args) {

        JScrollPane scrollPane = new JScrollPane();

        err.println(scrollPane.getPropertyChangeListeners().length);
        scrollPane.updateUI();
        err.println(scrollPane.getPropertyChangeListeners().length);
        scrollPane.updateUI();
        err.println(scrollPane.getPropertyChangeListeners().length);

    }
}
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With MotifLookAndFeel the number of listeners will be growing - verified on JDK6, JDK7, JDK8, JDK8u26 (on Win/Solaris) - the output will be

2
3
4

While with default LaFs (on Win/Solaris) the output will be

2
2
2


The following test which is new to JCK8 (not present in JCK7) fails due to this

api/javax_swing/JScrollPane/indexTGF.html\#UpdateUI[updateUI_PropertyChangeListener_list_notGrows]


--- original report from JCK QA ---

JDK 8 b129
JCK 8a QAC b12

Other Options
-Dswing.defaultlaf=com.sun.java.swing.plaf.motif.MotifLookAndFeel
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