Keys for JScrollPane.setCorner(), which were added for Kestrel, can not be used.
  JScrollPane.LOWER_LEADING_CORNER
  JScrollPane.LOWER_TRAILING_CORNER
  JScrollPane.UPPER_LEADING_CORNER
  JScrollPane.UPPER_TRAILING_CORNER

Since constants which correspond the above keys exist in JScrollPane.java,
I can compile a program which uses JscrollPane.setCorner() with one of the
above keys.
However, the program causes IllegalArgumentException on runtime, because
setCorner() treats it as an invalid key.
  xxxxx@xxxxx   2001-06-07

N/A

These four keys are not handled at the set/getCorner() at all.

  xxxxx@xxxxx  

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Need to modify not only setCorner() & getCorner() but also 
other parts in order to make JScrollPane update corner components
correctly when setComponentOrientation() is called.
Committed to Tiger.
  xxxxx@xxxxx   2003-02-12

The problem with setComponentOrientaion() is filed as another bug.(4817131)
  xxxxx@xxxxx   2003-02-12

still a problem in 1.4b3