Duplicate :
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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.