a cell contain formula become null?

[Ma Zhiyong]

hi everybody 
  I am a new one for the POI,thanks for your help .
  I am using jakarta-poi-1.5.1-final,but when I read a cell that contain a 
formula, 
the cell become null. How can I manage to got the formula from the cell? 
thanks.



Zhiyong Ma
SINOBEST
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