test/javax/swing/JPopupMenu/PopupTest/MenuTester.java fails

The test fails on MS Windows Vista with at least 6u16 (also fails on 6u18). The test output:

----------System.err:(87/2183)----------
Menu testing starts
--- Running tcEmptyMenu
> hit key F10
> hit key Down
> hit key Up
> hit key Escape
> hit key Alt-E
> hit key Right
> hit key Down
> hit key Down
> hit key Right
> hit key Up
> hit key Down
> hit key Right
> hit key Down
> hit key Up
> hit key Right
> hit key Left
> hit key Right
> hit key Right
--- Running tc4213634
> hit key Alt-M
--- Running tc4503016
> hit key Alt-2
> hit key Down
> hit key Right
> hit key Down
> hit key Up
> hit key Right
> hit key Up
> hit key Down
> hit key Right
> hit key Right
> hit key Left
> hit key Down
> hit key Down
> hit key Right
> hit key Left
> hit key Left
--- Running tcWin2kAltTest
> hit key Alt-Alt
> hit key Right
> hit key Down
> hit key Alt-Alt
--- Running tc4730233
> mouse moved to Pets
> mouse click
ERROR: Test failed with TestFailedException: Pets isn't visible at
--- Running tcDuplicateMnemonics
> hit key Alt-E
> hit key C
> hit key C
> hit key C
> hit key Alt-C
> hit key Alt-C
> hit key Alt-C
> hit key Escape
> hit key C
> hit key C
> hit key C
> hit key Alt-C
> hit key Alt-C
> hit key Alt-C
> hit key Space
< menu item chosen: Copy
Testing finished
The following testcases failed:
  tc4730233
To rerun failed testcases, run:
java MenuTester tc4730233
To rerun failed testcases, run:
java MenuTester tc4730233
java.lang.RuntimeException: Some test cases failed
at MenuTester.report(MenuTester.java:476)
at MenuTester.test(MenuTester.java:445)
at MenuTester.main(MenuTester.java:481)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:619)