Stack Trace does not appear on NPE in 1.4.2_11.

Configuration :
 UltraSparcII 400[MHz] *2
 4[GB]
 Solaris9

How to reproduce :
1. Compile attached .java programs
2. Launch
    " java -server -cp . TestNPO 100"
  in 1.4.2_11 on Solaris9 box.

The following message will show up.
...
Thread-72 start
Thread-83 start
Thread-54 start
Thread-52 start
Thread-81 start
Thread-88 start
Thread-58 start
java.lang.NullPointerException
java.lang.NullPointerException
java.lang.NullPointerException
java.lang.NullPointerException

Although NPE occurs several times, stack trace does not show up.