Recalculation in excel thru java

Hi,
Thru java program i can able to read and write the values into the excel sheet. but...Latest re calculating values are not available to read
Example, for the following situation i am not getting right values
In worksheet1 cell A1 = 10 (writing this value thru java pgm)
worksheet1 cell B1 = 5 (writing this value thru java pgm)
worksheet1 cell C1 = A1 * B1 (writing this formula manually)
close the excel thru program
open the worksheet1 and read the cell C1 value thru program now newly calculated is not available.
if i open the excel sheet manually and read the cell value C1 thru program.then new value is available.
could you please help me.
thanks in advance
GS

I have a similar problem using a JDBC-ODBC bridge, and i solve it closing the connection after an update.

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