A DESCRIPTION OF THE PROBLEM :
When setting time in Calendar.setTime(Date date), if 'Date date = null' then setTime() results nullPointerException since it is not able to call date.getTime() within itself. This problem needs null check, and possible default value setting if date = null.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute the following in Java

Date date = null;
Calendar.setTime(date);

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Possible default value setting?
ACTUAL -
NullPointerException