CPU usage becomes 100% in simple awt program in 6.0b36 when japanese chars. are input

When customer tries to input Japanese chars. to textfield and click the textfield in another
diologue, CPU usage becomes 100%. That seems freeze.
This issue occurs not only in 6.0-b36, but also in 1.4.2_08 and 5.0u3.

REPRODUCE :
 (1) Compile the attached Frame1.java Dialog1.java
 (2) Launch "java Frame1"
     A window which has textfield and button with "button" label show up.
 (3) Click the "Button"
     Another window which has a textfield shows up over the window at step (2)
 (4) Input some Japanese characters with full-width to the textfield at step(3)
     (Don't press "enter" key to determine. Keep prompting mode.)
 (5) Click somewhere in the textfield in the window which appears at step(2)

   Here, you can confirm the CPU usage is going up to 100% in Task Manager.

CONFIGURATION:
 JRE : 6.0b36/5.0u3/1.4.2_08
 CPU : Pentium IV 1.4[GHz]
 Mem : 384[MB]
 OS : WindowsXP(SP1, Japanese)
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