FULL PRODUCT VERSION :
1.4.x

ADDITIONAL OS VERSION INFORMATION :
win2ksp4

A DESCRIPTION OF THE PROBLEM :
SimpleDateFormat.setTimeZone(TimeZone) (or perhaps some base class) does not throw a NPE if a null is passed in.

This may create difficult to trace / ambiguous NPEs at a later time, such as in the exmaple of calling DateFormat.format():

java.lang.NullPointerException
	at java.util.GregorianCalendar.computeFieldsImpl(GregorianCalendar.java:1321)
	at java.util.GregorianCalendar.computeFields(GregorianCalendar.java:1298)
	at java.util.Calendar.setTimeInMillis(Calendar.java:927)
	at java.util.Calendar.setTime(Calendar.java:902)
	at java.text.SimpleDateFormat.format(SimpleDateFormat.java:782)
	at java.text.SimpleDateFormat.format(SimpleDateFormat.java:775)
	at java.text.DateFormat.format(DateFormat.java:314)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Pass a null to SimpleDateFormat.setTimeZone; no Exception is thrown.


REPRODUCIBILITY :
This bug can be reproduced always.