The test is java/awt/event/KeyEvent/KeyChar/KeyCharTest.java.
First, in this PIT build there is a new quite unexpected exception running Windows (7 and 10) (plus a dump of some EncodeD):
java.lang.IllegalArgumentException: invalid keyChar
at sun.awt.windows.WToolkit.eventLoop(java.desktop@9-ea/Native Method)
It is new in this PIT: b124 doesn't throw this.
Second, a test bug:
This test depends on a char returned by getKeyChar() from KEY_PRESSED and KEY_RELEASED. However that char is not necessary defined. According to the spec, "KEY_PRESSED and KEY_RELEASED events are not intended for reporting of character input." -- it's only KEY_TYPED event must report a valid keychar.
As a result, the test fails on Windows with "Key char is not delete" and indeed, it is 0xFFFF (CHAR_UNDEFINED) which is expected.