In Solaris Headless Testsuite fails throwing NPE when different methods related to installUI() is called.

BEGIN: javax.swing.JToolTip: do_getAccessibleContext_0
  !! FAIL: javax.swing.JToolTip: do_getAccessibleContext_0 status=fail with exception=java.lang.NullPointerException
java.lang.NullPointerException
        at javax.swing.plaf.metal.MetalToolTipUI.installUI(MetalToolTipUI.java:59)
        at javax.swing.JComponent.setUI(JComponent.java:405)
        at javax.swing.JToolTip.updateUI(JToolTip.java:85)
        at javax.swing.JToolTip.<init>(JToolTip.java:67)
        at javax_swing_JToolTip.do_getAccessibleContext_0(javax_swing_JToolTip.java:18)
        at javax_swing_JToolTip.run(javax_swing_JToolTip.java:3694)
        at java.lang.Thread.run(Thread.java:579)


Testsuite available at
/net/sqesvr/export/awt/awt_ws/Headless

Attached is the failiure scenarios which throws NPE and the complete Test Report
I could reproduce the failiure in both SolSparc 8 and SolSparc 9